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Hardware and Firmware Issues in Using Ultra-Low Power MCUs. Rev 2: May 2015 - Added link to Low Power Design article. Rev 4: March 2016 - Added section 12 about watchdog timers. Today many of us are building ultra-low power embedded systems that must run for years off a battery. The idea is that these systems are nearly always in a deep sleep mode, waking from time to time to do something before going back to sleep. Many vendors of microcontrollers (MCUs) claim their products can run like this for decades from a coin cell.
These claims are mostly bogus. This report describes the hardware and firmware issues one must consider when designing very low-power coin-cell products. There are a lot of nuances; even decoupling capacitor selection can hugely influence battery life. You'll also find data from which one can predict what sort of battery lifetimes are achievable here. Because the report is very long and covers a number of related subjects, not everyone may need to read the entire thing. Here's a roadmap so you can get to the sections important for by dr your design efforts: Background -- Do read this.
It gives a bit of information about robert essay leadership, coin cells, and expert dg hessayon then shows how the basic assumptions made by MCU vendors are completely off-base. They talk about how long a system can sleep; we care about the new questions, how much work can be done when it is the flower expert by dr awake. Term Help 100% Non Plagiarized? Three critical points are made in this section: first, coin cells aren't good for more than ten years , second, MCU sleep currents are almost irrelevant , and third, a system running for ten years off a CR2032 battery can only consume 2.5 uA on average . On Typical Specifications -- Many MCU vendors make glorious claims about low current consumption and quote astonishing numbers. Dig into the datasheets and it's not uncommon to find these as typical specifications. I investigated what typical means. The result: never, ever, use a typical specification as design guidance . CR2032 Behavior -- How does a coin cell behave in these very low-power applications? No one seems to know, so I took a ton of data. The results are surprising and bode ill for long-lived systems. You may find that less than half the battery's advertised capacity is actually available in a real system . Leaks and Drains -- The MCU is not the only power consumer on a board.
Even the capacitors leak -- a lot. This section examines other, usually neglected, sources of dg hessayon leaks that may profoundly affect your design. Decoupling, and the new common app essay questions Using a Capacitor to by dr, Boost Vdd -- Pick the wrong decoupling capacitor and your system will discharge the battery in a short time. And, given that an ultra-low power system sleeps most of the time and wakes for only milliseconds, can we use a capacitor's time constant to keep Vdd high enough to power the system during the brief time it is awake? Hint: the of peloponnesian war essay answer is no. Running Fast to Save Power -- The vendors recommend running the by dr dg hessayon MCU as fast as possible to get back to sleep quickly, as the total power consumption will be less than running at a slow clock rate. About Knowledge In The? While that is true, it is naïve.
There are other factors to watch out for. This section is important for firmware designers. Dropping Vdd to Cut Current and Increase Battery Life -- You might get some benefits by reducing Vdd to the MCU, but there are some caveats. Most Brown-Out Reset Circuits Don't Work -- Don't use the MCU's brown-out circuit . It will not perform as you would expect in most cases. An alternative is presented. The Flower By Dr Dg Hessayon? Firmware people take note.
Reverse Battery Protection -- Careful design means making sure a battery installed backwards won't cause problems. Alas, the usual fixes create more problems than they solve. UL Coin Cell Requirements -- UL is very strict about using coin cells. Here are the rules, and their implications. Battery Droop Over Time -- With a load on a coin cell the voltage decays for a while. and then, oddly, stops. Figure on ways to start a university another 10% loss of capacity due to the flower, droop . Watchdog timers - How does one manage a watchdog when sleeping most of the time? Summary Reviews of writing strategies for middle school tools to profile low-power systems. This isn't really in this report; this is a link to my web site's reviews.
Another great resource on these issues is the flower by dr dg hessayon Low Power Design by CMicrotek. It covers other important issues about these applications, and is highly recommended. There's a sleep current war raging between MCU vendors. Ways A University Essay? Marketing glitz and web pages are the guns; white papers are the ammo, which is being broadsided with increasing frequency. Much of what is expert dg hessayon claimed is probably true, but more than a little of it is the new questions misleading and/or irrelevant.
It's truly remarkable just how little current is needed to keep a processor alive today. In the the flower expert dg hessayon deepest sleep modes even some ARM parts claim just 20 nA (nanoamp) of consumption. That's a mere 0.02 microamp, a number that boggles the mind. In the desktop world CPUs suck over servant leadership 100 amps while active, so I salute the MCU community for achieving such astonishingly-low figures. First, some context. In the trenches of the flower by dr this war lie the causes lowly CR2032, a typical coin cell that's oft-quoted as the canonical battery for the flower by dr dg hessayon extremely-long-lived systems. A CR2032 has about 225 mAh of capacity (quoted capacities vary a little depending on the vendor), which means it can source one mA for strategies 225 hours. (Note there is some dependency on the flower expert capacity vs. The New? how fast one discharges the battery). Its nominal voltage is 3.0, perfect for these 1.8 to 2V min MCUs, and the discharge curve has a sharp knee. They are considered dead at 2.0 V, which is confirmed by my experiments.
Here's data for a number of batteries, all from one batch from the the flower expert same vendor, discharged at the new common questions, a 0.5 mA rate: Batteries discharging at a 0.5 mA rate . Some of the vendors claim their MCUs can run for 20-30 years from a single CR2032. That's may be true in theory, but not in practice. The first question one must ask is: are the batteries rated for those kinds of lifetimes? I contacted a number of battery vendors. None guarantee shelf lives over ten years. Expert By Dr? One vendor said: Not recommended for use after shelf life expires as the chemicals in the battery break down and it loses power a lot quicker, and there can be corrosion or leakage. It's poor engineering practice to use a component beyond its rated specifications. For this discussion I'll assume that the maximum achievable lifetime of a system powered by a CR2032 is 10 years , because that's the essays knowledge in the age life guaranteed by the battery vendors.
Though the war is all about battery lifetime of a mostly-sleeping system, that's irrelevant for design engineers. The right question - which no one seems to be asking - is: how much useful work can the system do while awake ? Useful work translates into a lot of things (clock rate, instruction set efficiency, etc.), but is ultimately bounded by how much current the system (MCU and other components) can consume while awake. It's is the budget a design engineer has to work with, and cannot be exceeded (on average). Doing the math, I came up with the following curve, which assumes a ten year battery life for a cell with 225 mAh capacity. It shows the number of the flower dg hessayon mA available while awake, as a function of time spent sleeping and amount of current consumed while sleeping. The bottom curve is a system that uses 2 uA while sleeping; the top is information one using 20 nA. mA available as a function of sleep time and sleep current. For systems that sleep the vast majority of the the flower by dr dg hessayon time, the following chart blows up the data at the right side of the good ways to start essay graph above: Here's the key takeaway: Sleep currents are almost irrelevant . Take two MCUs, one that needs 20 nA while sleeping and another that consumes 200 nA. The available awake current is just about the same in both cases.
Even one that sucks a microamp while sleeping gives results not much different from an MCU needing an the flower by dr, order of term paper help non plagiarized magnitude less. If the system (MCU plus everything else) draws a microamp or less when sleeping we find: If your system sleeps 99% of the the flower by dr time you only have a 0.24 mA budget while awake. Good To Start? This means the system is awake 36 seconds per hour over ten years before the dg hessayon battery is depleted. Essays About In The Information Age? And while it's awake, you cannot, on expert dg hessayon average, draw more than 0.24 mA. If the system sleeps 99.7% of the time you have 0.8 mA available and are awake 11 seconds per hour. And while it's awake, you cannot, on average, draw more than 0.8 mA. At a 99.97% sleep time there's 8-10 mA available during wake times, and the system is awake 1 second per hour.
And while it's awake, you cannot, on average, draw more than 8-10 mA. It's useful to think about a total system current budget. For a CR2032 with 220 mAh of capacity running for ten years the calculation is simple: x-amps is the average current consumed by the system over a decade, and questions works out to 2.5 uA. Integrate the current used during sleeping and waking times; if it averages more than 2.5 uA the battery won't last ten years. Another way of looking at this, as we'll see later, is that, since the expert system sleeps most of the time, the common app essay questions parasitic drains (sleep current plus other circuit drains) cannot exceed 2.5 uA . Check out the electrical specs of an ultra-low power MCU. Clearly we're really concerned with the current used in various modes. Surprise! Many only the flower give typical (i.e., no worst-case) specifications. It wasn't always this way. Here's an example from TI's 1976 TTL Databook for the 7447A BCD to seven segment decoder/driver: Note that all of the specs have a max or min number, and the data shows what conditions those numbers apply to (e.g., Vol is with Vcc-MIN, Vih=2, Vil=0.8, Ioh=-200 uA).
Admittedly, in the olden days just a few pages were enough to fully document a part. Today a thousand page datasheet isn't uncommon. Properly characterizing a component isn't easy. Here's another datasheet -- it's from of peloponnesian, a box of dg hessayon Entenmann's donuts: These are worst-case specs.
They are guarantees. Contractual terms between Entenmann's and the buyer. You know what you're getting. Here's some sleep current consumption data from an MCU datasheet: Typical (+25C): 0.01 uA.
Typical (+60C): 0.04 uA. Maximum (+85C): 2 uA. Maximum (+125C): 10 uA. What does that mean? The range covers three orders of magnitude. Decades ago one of my mentors taught me to never use a typical spec; always design for worst case. Servant? That has been good advice which I've only violated in circumstances where some other data was available or a wide distribution of values was acceptable. TI agrees. Their datasheet for the LPV521 op amp states: Typical values represent the most likely parametric norm at expert dg hessayon, the time of characterization.
Actual typical values may vary over about knowledge information time and will also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material . (Emphasis added). So how does one interpret the current consumption data listed earlier? My first reaction is to by dr dg hessayon, use the paper 100% max (+85C) number as that is, presumably, guaranteed. But that's 200X the room-temperature typical value. While there's really not enough data to use for curve fits, an exponential trend line fits pretty darn well, which is hardly surprising given that much of the current is consumed by reverse-biased P-N junctions (think of the Shockley diode equation). But that's mixing typ and max values, a proverbial conflation of apples and oranges. I have always assumed typical represents an average, or the most-likely value in some probability distribution function. But does it? I contacted tech support of expert by dr dg hessayon several semiconductor vendors and asked what typical means.
The responses were hardly enlightening. Energy Micro (now owned by Silicon Labs) was the first to reply. Of Peloponnesian War Essay? They said: A typical for the flower dg hessayon Energy Micro's specs is the mean value of the devices measured. So [it's] not really dependent on for middle the standard deviation. Most CMOS characteristics have a normal distribution, so mean and median are pretty much the dg hessayon same thing. That mirrors my expectation, but since bigger standard deviations implies a wider range of values the mean doesn't tell us much about what to creative writing strategies for middle school, expect.
Yet the the flower datasheets for the new Energy Micro's ultra-low power MCUs offer (as of this writing) only typical current consumption values. TI weighed in soon after. 'Typical' values in datasheets are not taken from by dr dg hessayon, probability functions. These are taken from term 100% non plagiarized, multi-lot characterization testing with the mode being considered the 'typical' for a give[n] set of characterization parameters (temperature, Vcc, etc). That's interesting but not terribly helpful. The Flower? The mode alone tells us nothing about what kind of values one can expect. And TI, like most vendors, only lists the typ value (no min or max) for some parameters on at least some of their MCUs so we don't get even a sense of the distribution that can be expected. Microchip responded: Typical' is the average of our characterization data. They then referenced a datasheet that says These parameters are characterized but not tested. About Knowledge Information? Data in 'Typ' column is at 3.0V, 25C unless otherwise stated.
These parameters are for design guidance only and by dr dg hessayon are not tested. Freescale replied with a link to creative writing strategies school, a Kinetis data sheet. Section 3.8 reads: A typical value is a specified value for a technical characteristic that: * Lies within the range of values specified by the operating behavior. * Given the typical manufacturing process, is representative of that characteristic during operation when you meet the the flower by dr typical-value conditions or other specified conditions. Given that typical is the new app essay representative of that characteristic one might assume this means one can expect the dg hessayon part to behave much like the specified typ data. But the example shown on that datasheet just a few lines later rates a current with a min of 10, typ of 70, and max of 130 uA. The standard deviation is enormous. The typ value teaches nothing about the range of values to expect (though, in essays about knowledge that example, the min and max tell us everything we need to know; wise engineers will create a design that works properly over by dr that entire range).
March 2015 Update: Freescale's latest datasheet for their KL02 Cortex M0+ MCUs now states: “The maximum values stated in the following table represent characterized results equivalent to the mean plus three times the standard deviation (mean + 3 sigma)” The listed power consumption numbers are given as max values. That's useful engineering data! Kudos to Freescale. NXP told me: We have not seen a universal definition of robert leadership 'typical', though it has been one of the most commonly used terms in the industry and product. One interpretation would be that 'typical'#157; represents 'material that comes from our production process under standard SPC (statistical process control.)' Again, this is interesting and useless, at least for practicing design engineers. In 2013 an FAE from a large semiconductor vendor told me some of their typical numbers are really marketing tools.
Does that mean they can change with the competitive landscape? Our competitor just dropped their typ specs; we better do the same! The bottom line is that the meaning of a typical spec is by dr devoid of engineering value. If a spec isn't guaranteed, it's not a spec, it's an aspiration. Min/max specs are guarantees. Typical is causes of peloponnesian war essay not. The Flower Expert By Dr Dg Hessayon? It's time for us to rise up and demand better data! Power to the processors! (Well, I guess we want to minimize power to causes, the processors in these applications). Some vendors take their MCU's sleep currents and divide those into dg hessayon, a CR2032's capacity to get huge and improbable lifetimes. Greenleaf Essay? But how do coin cells really behave in these low-power applications? No one knows!
Even the expert by dr battery vendors provide only the slimmest amounts of data for systems that go from a deep sleep to needing power for a handful of robert greenleaf essay ms. So, I discharged many CR2032s with complex loads applied for short periods of time and have acquired millions of data points. Nine-cell battery profiler using an ARM controller board. Expert? Transistors switch different loads on term help non plagiarized each battery to run various current and time profiles. Loads are low tempco, 1% resistors. An A/D reads battery voltages and Vce of the transistors. A precision reference and software calibrates the entire analog path.
The following results are for 42 batteries from Duracell, Energizer and Panasonic (including other experiments detailed later, I discharged roughly 100 coin cells). For each vendor I ran two groups of cells, each group purchased months apart from distributors located in distant States, in hopes that these represent different batches. The Flower Expert By Dr? (The devices are not marked with any sort of serial or batch numbers). First, the essay servant weird part. Our local grocery store sells these cells for the flower by dr dg hessayon up to $5 each. Yet Digi-Key only essays about in the information age wants $0.28 for expert dg hessayon a Panasonic and $0.40 for an Energizer -- in term singles. Duracells are harder to find from commercial distributors, but I paid about a buck each from on-line sources (e.g., Amazon).
I found little battery-to-battery variability (other than one obviously bad Panasonic and one bad Duracell), little vendor-to-vendor difference, and likewise different batches gave about the same results. What parameters matter? Chiefly, capacity (how many milliamp-hours one can really get from a cell), and the flower expert by dr internal resistance, which varies with capacity used. All of the vendors say dead is at 2.0 volts. The following graph shows the robert greenleaf essay average voltage for the batteries from each vendor, as well as the worst-case voltage from by dr, each vendor, as they discharge at a 0.5 mA rate. The curve ascending from left to essays information age, right is the cumulative capacity used. By the time 2.0 volts is reached the capacity variation is in the noise. I found it averaged 233 mAh with a standard deviation between all results of the flower by dr dg hessayon 5 mAh.
Energizer and Duracell's datasheets are a bit, uh, optimistic; Panasonic says we can expect to get 225 mAh from a cell, which seems, given this data, a good conservative value to use. But in practice you won't get anything near that 225 mAh. It's useful to term paper help 100%, model a battery as a perfect voltage source with an internal series resistance, as follows: As cells discharge their internal resistance (IR) goes up. Actually, this is not quite correct, despite the claims of all of the published literature I have found. Other results detailed later in this report shows that there's something more complex than simple resistance going on, but for now IR is close enough. The next chart shows average IR for the flower expert by dr each vendor's products, plus the IR's standard deviation. Internal resistance and its standard deviation. So what does this all mean to a cautious engineer?
The IR grows so quickly that much of the battery's capacity can't be used! First, the average IR is not useful. Conservative design means using worst case figures, which we can estimate using the essay servant leadership measured standard deviation. By using three sigma our odds of being right are 99.7%. The following graph combines the the flower by dr dg hessayon IR plus three sigma IR. Paper? Depending on the load, the drop across the battery's internal resistor will reduce the voltage delivered to the system, as shown: Voltage delivered from expert dg hessayon, battery depending on term paper help load. If a system, when awake, draws just 10 mA 88% of the battery's capacity is available before the expert by dr voltage delivered to the load drops to 2.0. It's pretty hard to about in the information age, build a useful system that only needs 10 mA. Some ultra-low power processors are rated at 200 uA/MHz with a 48 MHz max clock frequency -- almost 10 mA just for the flower expert by dr dg hessayon the CPU. With higher loads, like any sort of communications, things get much worse.
Bluetooth could take 80 mA, and even Bluetooth LE can suck nearly 30 mA. At 30 mA only the new questions 39% of the battery's rated capacity can be used . By Dr Dg Hessayon? An optimist might use two sigma and suffer from 5% of essays in the his systems not working to spec, but that only increases the useful capacity to 44%. Expert By Dr Dg Hessayon? The battery will not be able to causes, power the expert by dr dg hessayon system long before it is creative strategies really dead, and long before the the flower by dr system's design lifetime. And long before the time MCU vendors cite in their white papers. (Some MCUs will run to 1.8 volts, so vendors might say my cutoff at 2.0 is strategies school unfair.
Since battery vendors say that 2.0 is the flower by dr dead I disagree. And, even if one were to run to robert essay, 1.8V there's less than a 5% gain in useful capacity.) The microcontroller doesn't live in a vacuum; it's part of the expert dg hessayon system. Other components draw power, and it's the design engineer's job to evaluate those drains. Some may be surprising. I have a lot of evaluation boards here; many are designed to show off the long-battery-life aspects of a particular processor. It's interesting to examine the designs.
I put one of the boards under a microscope and looked at some of the ancillary parts. There's a 22 uF decoupling capacitor. No real surprise there. It appears to be one of those nice Kemet polymer tantalums designed for high-density SMT applications. The datasheet pegs the cap's internal leakage at 22 uA. That means the capacitor draws a thousand times more power than the typical value cited for the dozing CPU. To Start? In fact, the expert by dr cap alone will drain the battery in under a year! Engineers may argue that 22 uF is a really high value. But that's what the silicon vendors suggest.
Silicon Labs application note AN0002 Rev 1.36, dated 2013-9-16 describes how they'd like to see an ultra-low power MCU decoupled. Good Ways? Over 20 uF is required. A capacitor has parasitics, and in simplified form looks like this: Usually the ESR (equivalent series resistance) is pretty low; for caps that are not wound ESL, too, is the flower expert dg hessayon low. One would hope that Rleak would be infinity.
Alas, that's far from true. For decoupling capacitors, Rleak is essentially a resistor from the coin cell's positive terminal to ground. For all of the years the MCU is sleeping, Rleak is discharging the battery. Section 5 of this report gives more information about selecting decoupling capacitors; a poor selection is guaranteed to writing for middle school, drain the battery in the flower expert dg hessayon a short period of time. Tantalums leak far too much to use as decoupling capacitors. Most MLCCs won't work, either. Use the advice in that section to specify the right decoupling parts. There is common app essay questions good news for by dr dg hessayon designers: if the the new common questions batteries start failing at the five or seven year mark, probably no one will remember who is at fault. What about other sources of leaks? For instance, does handling parts leave finger oils behind that can drain a battery? A lot of on-line pundits bloviate that the leakage problem is a big factor; experience shows that the more an expert by dr, Internet poster asserts that X is an indisputable fact, the more likely it's not. (A century and the new common app essay questions a half ago, Charles Darwin noted that ignorance more frequently begets confidence than does knowledge.) This is engineering, not speculation, so I decided to the flower by dr dg hessayon, run some experiments to creative writing for middle school, see how significant these leaks are in the flower dg hessayon a digital circuit.
But how to do so? Clearly, to get meaningful data one must measure these drains to a resolution much better than the to start 20 nA (nanoamps) or less some of the MCUs use while sleeping. One could use a DMM to measure leakage in ohms. The Flower Expert Dg Hessayon? They often only good to start a university essay go to 40 Mohms, which at 3 volts would represent about a 100 nA leak. That's too crude. The uCurrent tool can resolve to a single nA, which is probably adequate, but at dg hessayon, 1 nA it generates only a single mV, which is robert greenleaf leadership pushing the resolution of most DMMs pretty hard. So I built a sample and hold circuit (SH). A high quality polypropylene 1 µF capacitor feeds a very high impedance op amp follower. The Flower? Put a component whose properties you want to measure around the cap, charge it up, and watch the discharge curves by reading the op amp. Sample Hold circuit to test for very low leakages.
I used an essay servant, LM662 op amp, which has a 2 femtoamp (typical - no max is the flower expert by dr dg hessayon listed) input bias current. One fA is a miniscule 10 -15 amps, a millionth of a billionth of an amp, or about 6000 electrons/second, so its effect on the capacitor is minimal. Essays About? The amplifier's inputs and the cap's connection are all made in the air. A Cortex M3 controller with a 12 bit A/D reads the amplifier periodically, as well as temperature and humidity sensors, and the flower expert dg hessayon shoots the results to a PC via USB for creative logging. Measuring the time constant with a 10 Mohm resistor across the the flower expert capacitor proved the circuit worked as expected.
I then charged the cap and, with no load other than the op amp, took data for good ways to start a university two days to characterize the circuit. The results are summarized in expert the following graph. The 12 bit A/D is at the extreme end of its resolution so each data point is the average of 5000 samples. Clearly the voltage is highly dependent on temperature. Causes Of Peloponnesian War Essay? We heat with a wood stove, and this data was taken during a very cold few days in January. By Dr Dg Hessayon? The dips bottomed out in the morning as the of peloponnesian war essay house cooled all night; they veered up when I restarted the fire. My goal was to measure the resolution of the circuit, but the results are very hard to expert, interpret as it's tough to separate out the temperature effect. Has it discharged at term paper help, all? Plotting voltage against temperature:
The voltage across a capacitor that is discharging over expert by dr time is: Where V0 is the initial voltage on the cap and t is the elapsed time. Taking the natural log and rearranging we get: R is the effective resistance that bleeds charge from the capacitor. Some of that resistance is due to the bias current going into the new common questions, the op amp; some is in the cap body itself, and some is from the flower expert dg hessayon, leakage into air. Ohm's Law converts R to amps. Creative Writing School? If the voltage decayed by expert, 1 mV this gives 6.6 fA of the new common leakage from all sources. Alternatively, by the flower dg hessayon, plugging 10 fA into the equation the voltage would have decayed to 3.228, which would have been very easy to see. So the SH can resolve better than 10 fA.
That's many orders of magnitude lower than any leakage that would concern us in designing a low-power system. A 1 cm-wide test article PCB bridges the capacitor, as shown in the picture. It was perfectly clean and I handled it with gloves to causes of peloponnesian war essay, avoid contamination. There's a 0.5mm grove whittled across the board. How much does FR-4 material leak in 30% relative humidity? I have no idea.
But the expert by dr SH confirmed that it's less than 10 fA. Datasheets always warn about specs being valid only in non-condensing humidity. How important is robert servant that? I boiled some water and the flower dg hessayon collected the condensate to robert greenleaf servant leadership, emulate the sort of moisture that likely makes up water vapor in the air, and bridged the test article's insulating gap with a 2 mm diameter drop. Just over 1 µA flowed, similar to figures available on-line. Expert By Dr? Conductivity is measured in units of ohm-meters, so there could be a lot of µA flowing in to start a real PCB with more surface area under water. Despite extensive searches I couldn't find any useful data about how the conductivity of a PCB is affected by humidity. I don't have convenient access to expert, an environmental chamber so ran some very crude experiments. I covered the test article and humidity sensor with a plastic coffee can with a hose protruding from the causes war essay bottom. Taking data in real time (with humidity and the flower voltage readings displayed on the PC) I huffed and causes of peloponnesian war essay puffed into the hose.
At 70% relative humidity the test article's leakage went from under 10 fA to 13 pA, a jump of three orders of magnitude. Expert By Dr? At 80% (the highest I was able to achieve) that went to 20 pA. Now, this is over a 1 cm long gap, so a better metric is 20 pA/cm. A board with 50 cm of track would experience about 1 uA of leakage, enough to eat almost half of ways to start a university essay a CR2032 battery's 10 year power budget of the flower dg hessayon 2.5 uA. There are two mechanisms for leakage due to good ways a university essay, humidity.
The first is through the the flower by dr dg hessayon moist air that separates two tracks or terminals. The second is via adsorption of water molecules on the surface of the PCB. Common App Essay? Other contaminates like dirt that might have a very low conductivity can adsorb water molecules and reduce the board's resistance. Expert By Dr Dg Hessayon? According to Evaluation of Cleanliness Test Methods for Spacecraft PCB Assemblies (P. E. Tegehall and B. D. Dunn, ESA STM-275, October 2006) a water film just 20 molecules thick will have a conductivity that is only an order of magnitude lower than that of bulk water. What about contamination? Bare boards and batteries get handled, often carelessly, and assembled PCBs, too, may be stocked and used without regard for cleanliness. A common concern is leakage due to finger oils.
Lots of on-line pedants complain that this is a very significant problem. But hard data is the new scarce. I grabbed a bottle of my wife's Jergens Dry Skin Moisturizer, Original Scent, and spread the thinnest layer I could on expert dg hessayon the test article insuring the entire 1 cm long gap between copper foils was bridged. The leakage was too much to paper help, measure with the the flower expert by dr SH. But 24 hours later, after the volatiles evaporated, it was down to 180 pA. After another day the leakage hadn't changed. That's 0.18 nA, not much, but is over a short 1 cm length, and could add up with lots of contaminated PCB tracks. After cleaning the non plagiarized board with isopropyl alcohol the leakage was 2 pA, the better part of three orders of magnitude worse than when I tested the dg hessayon fresh, uncontaminated board.
More cleaning didn't help. The Moisturizer had effected some change to the PCB. Happily, 2 pA is a very small value, though it could be disastrous to the new, some analog circuits. Next came the finger oil test using both lovely soft female fingers which an hour earlier had been gooped up with the Jergens, as well as nasty crackled Jergens-free male fingers. Expert? We touched the test article gently, rubbed some, then smeared furiously. In no case did the leakage exceed 8 pA. Now, that's enough to cause the SH's output to droop by more than 50 mV in app essay 20 seconds, devastating in a sensitive analog sample and hold circuit. But it's not enough to have any measurable effect on battery life. Since containments can increase the adsorption of water molecules I exposed the finger-oily test article to 80% relative humidity.
The numbers rocketed to 65 pA, three times the humidity result with a clean board. Again, 65 pA is expert by dr dg hessayon nothing, but multiply your track lengths by the 1 cm long test article used in this experiment. Could leakage come from salts left behind from perspiration? I mixed up a solution of warm water and salt, supersaturating the solution to the new questions, the point where the water could hold no more salt, and completely coated the 1 cm gap in the test article. Wet, the leakage was unsurprisingly too huge to measure with this circuit. Expert Dg Hessayon? But after the water dried, it dropped to under 50 fA at 30% ambient relative humidity. That's with dry salt. Essays About Age? Subjecting the test article to the flower dg hessayon, 50% relative humidity caused the leakage to jump to 2 µA. This is creative for middle school a very contrived test. It's hard to believe that handling a board would leave so much salt behind (as confirmed by my finger-oil experiments). Using a fresh test article, I tested several kinds of rosin, first soldering while taking care to insure the rosin smeared across the the flower expert by dr dg hessayon gap in the new common app essay questions the copper foil, and later just gooping bulk rosin across it.
The worst leakage was 2 pA. Adding 80% humidity simply boosted the number to dg hessayon, 20 pA, the same result for a clean test article. Interestingly, careful cleaning with isopropyl alcohol boosted the drain to creative strategies, 32 pA over the flower expert dg hessayon the 1 cm gap length. Recleaning even more carefully got that down to 4 pA. The 2006 study cited earlier tantalizingly hints that boards should undergo a two hour (!) bath in an ultrasonic cleaner. My unscientific results suggest no cleaning is better than what seems a pretty rigorous dose, but isn't. What about solder mask? I reran the salt water experiment on a PCB whose traces were covered by a solder mask. Even sopping wet, the leakage was under 10 fA. The finger oil experiments, too, gave leakages too low to measure. Ditto for smearing Jergens on the board.
The solder mask seems to be a nearly-perfect insulator, though of a university essay course there will be no mask around solder joints. Here are the results: To summarize, assuming no sensitive analog circuits, the the flower experiments showed: Finger oils are not a big deal. Humidity matters if there's a lot of exposed track and the humidity is very high for a long time.
Condensing water is bad. Cleaning is hard, and may cause even worse problems. Solder mask solves essentially all of the leakage problems. The takeaway is that the greenleaf essay leadership usual practice of putting a layer of solder mask on a PCB eliminates leakage problems related to battery-powered MCUs. Don't worry about assemblers mishandling the board or the battery. There will be leakage around exposed pads, but outside of extreme environments that should have no noticeable effect on battery life. 5 - Decoupling, and Using a Capacitor to Boost Vdd.
Capacitors leak. By Dr? Some a lot. Term Paper Non Plagiarized? What type of decoupling capacitor should we use? A related question is: could adding a capacitor across the cell's terminals provide a short-term boost that could sustain a pulse load? It's not hard to show mathematically that the answer is yes. But the math is expert by dr irrelevant. In engineering we're always faced by conflicting needs and what appears a simple solution sometimes isn't. As shown earlier, it's useful to think of the battery as a zero impedance source with an common questions, internal resistor between it and the terminal. That resistor's value increases as the battery capacity is drained. If it were 50 ohms and the system needed 10 mA the terminal voltage is the flower expert down by half a volt, often enough to cause the MCU to crash. Add a big capacitor, as in the following diagram, and a short pulse load can draw on ways to start the charge stored in the cap.
In a TI white paper (Coin Cells and Peak Current Draw) the authors conclude that this is the flower a viable solution. They show a case where a capacitor must sustain a 30 mA load for 1 ms. An 87 uF capacitor will do the trick, though they recommend 100 uF since no one makes 87 uF devices. There are a couple of problems with this conclusion. First, the causes of peloponnesian war essay capacitor leaks.
It's always across the battery terminals, so is sucking juice, depleting the by dr battery, even during long sleep intervals. How much leakage? It depends on term paper 100% non plagiarized a number of factors, including dielectric material. Let's consider tantalums, which offer great capacitance versus cost figures. The following table shows the numbers for a 100 uF part. The Flower By Dr? (For tantalums it's usual to rate leakage in CV, where V is the term help 100% non plagiarized rated, not the applied, value.)
The last column is the most telling. Given that the average current draw over by dr 10 years cannot exceed 2.5 uA, just the capacitor's leakage will suck the ways to start essay battery dry in a fraction of a decade. Who would have thought that a cap could leak more than Edward Snowden? How about a better part? The best low-leakage capacitors with the C values needed are MLCC. MLCC leaks are specified in ohm-farads: It's clear Y5V dielectrics can't be used. Select a more expensive X7R device.
And, one must be careful which X7R is selected as some leak as badly as Y5Vs. Takeaway: be really careful which decoupling capacitors you choose! The X7Rs exhibit better temperature stability, which has always been the primary reason to the flower expert by dr, use them, but not as a function of leakage ! Here's a typical graph of normalized leakage versus temperature: A system that has to run over wide temperature extremes may leak two orders of magnitude more than shown in the previous table; that sweet AVX spec'd at school, 0.3 uA suddenly looks like a moderately low-value resistor. But even over room temperature, say 20 to 30 degrees, plan on twice the parasitic drain than specified. In the case of the AVX a quarter of the battery is lost to by dr, the capacitor.
MLCC devices derate themselves. As the robert greenleaf essay servant applied voltage increases, the effective capacitance decreases. Murata has a tool that helps model this, and here's the result for 22 uF parts: If space is precious you have few options. Apply 3 volts to a nice small 6 V 3216 device and only half the capacitance is available.
The TI paper specifies a 100 uF part, but in this package you'd have to use 200 uF. Alternatively, one could use a higher-voltage (bigger and more expensive) device, or use a larger package as shown in the graph. Capacitors have tolerances, and the flower by dr dg hessayon though X7Rs are generally +/- 20%, one still has to school, figure that in: Figure on expert an even bigger capacitor to deal with tolerance. Perusing various sites it's rather astonishing how few capacitor vendors specify leakage. 100% Non Plagiarized? A lot of the flower by dr them claim low leakage but don't give numbers. That's about as useless as a campaign pledge.
Kemet's excellent Application Notes for good essay Tantalum Capacitors does show how derating the voltage can help. Operate at by dr dg hessayon, the cap at a third of the rated voltage and the leakage will typically decrease by an order of magnitude. Go to ten percent of the part's rated level and leakage dives by creative, another factor of five. But in by dr a three volt system that means a 30 volt capacitor -- bigger and pricier. These deratings are typical numbers. Use with caution. So, despite the problems with capacitor deratings and creative writing strategies leakages, can use use one to temporarily sustain a Vdd high enough to the flower expert, keep an about in the information age, MCU from crashing during a brief waking period? The following graph shows the required capacitor, at expert dg hessayon, 20 degrees C, for 10, 20 and 30 ms pulses with various loads, ignoring all of the term 100% complicated effects noted above. You'll have to factor all of those parameters in as well, which, as we've seen, can more than double the required uF. The leakage numbers are based on that nice AVX component. Expert By Dr Dg Hessayon? Though the TI paper uses a capacitor to boost power for 1 ms, for Bluetooth and causes war essay other protocols tens of the flower expert ms are more likely.
So we've done the good to start essay math, and have figured out what size capacitor to buy. Let's ignore all of the unpleasantness and assume that a 100 uF part fits the bill, and that we're using a low-leakage AVX part. They're $14.50 each! Neither Digi-Key nor Mouser has them in stock, and quote a 25 week lead time as of the flower dg hessayon this writing. Digi-Key does have a 50 V version available today, but that will set you back $36.54. A complete Raspberry Pi with 700 MHz ARM processor and half a gig of RAM costs less than that capacitor. Maybe this is a government project where costs don't matter. Using the graph above we pick off a 400 uF part for a 10 mA 20 ms load (remember, this is before all of the derating that must be done). App Essay Questions? The leakage will eat about half the battery capacity. And, the capacitor doesn't exist; the biggest such part on the market is the flower expert by dr 220 uF.
You can't buy a bunch of smaller parts and parallel them, since the leakage will go up. What about a supercapacitor? These are astonishing devices that offer farad-levels of capacity. Alas, the lowest-leakage supercap I can find is from Cap-xx, and they quote 2 uA at 23C, doubling at 70C. That's impractical since even at room temperature it'll eat just about the entire 2.5 uA current budget. Summing up, in the use case I've described (ten years of system life from a coin cell) it's impractical to get a short Vdd boost from a capacitor across the common battery . There's an equation that's constantly bandied about when talking about power consumption of electronic devices. If you're designing battery-operated ultra-low-power devices, it's critical that you, well, ignore it. Engineers' eyes light up by the V-squared term; they immediately start looking for a way to lower Vdd to get more battery life. As we'll see there might be some benefit to dropping the expert by dr dg hessayon power supply voltage.
But this equation is irrelevant to ultra-low power systems because it measures power -- watts -- not current. Essay Leadership? High-performance systems live and die by power; have you seen the cooling towers on desktop CPUs? Battery operated systems are constrained by battery capacity, which is the flower dg hessayon measured in amp-hours; typically the units are milliamp-hours (mAh). Power is the new app essay not the issue for figuring battery lifetime. Think in terms of current. The following graph shows how one of Microchip's nice low-power MCUs uses current as a function of clock frequency: Note that doubling the clock rate from one to two MHz uses much less than a twice the current. The reason is that the CPU is the flower expert by dr dg hessayon only one of the powered components. Memory and peripherals suck coulombs, too, and not all of these needs vary with clock frequency. There's a static, constant draw, and paper help 100% non plagiarized one which is a function of frequency.
It's not hard to the flower, pick points off the graph at 3.5 volts and solve a couple of simultaneous equations, which gives: Static current: 0.39 mA. Dynamic current: 0.11 mA/MHz. At one or two MHz most of the information age current is used by static loads. At higher frequencies the constant draw is still significant.
It's clear that wise designers will run at the flower expert by dr dg hessayon, the max possible clock rate to creative writing strategies for middle school, get back to the flower dg hessayon, sleep as quickly as possible. Creative? This is the expert dg hessayon advice given by all of the MCU vendors. And it's wrong. Common? Or at by dr dg hessayon, least naïve. Remember how a battery's internal resistance increases as it is good ways to start depleted?
Here's the the flower expert dg hessayon graph again, which shows the voltage delivered by good a university, the battery depending on load: If one were to follow the advice to run as fast as possible, coming out of a sleep state means the system will be drawing perhaps a lot of current. Dg Hessayon? Over time, the battery's internal resistance will increase to a point where it may have a lot of capacity left, but cannot power a speedy current-hungry MCU. Wake up, and essays about in the Vdd drops below the minimum allowed, so the processor crashes. At least one series of MCUs advertised for ultra-low power operation consumes 200 uA/MHz, maxing at 48 MHz. That's about 10 mA just for the MCU. The Flower Dg Hessayon? The battery might not be able to essays about in the information, sustain a 10 mA load, but at 1 MHz -- 200 uA - it can have plenty of life left. The moral is to the flower by dr, wake up at a low clock frequency. Ramp it up while watching Vdd, stopping a bit above the MCU's cutoff point.
Be sure to creative writing strategies for middle school, factor in the needs of the flower dg hessayon I/O you'll be powering up. Alternatively one could apply some a priori knowledge (e.g., track consumed mAh and use data such as in the graph above to estimate the operating point) to set the robert servant clock frequency. But if you take the vendors' advice and wake up at the flower expert, full throttle, the useful battery lifetime may fall far short of knowledge in the your design goal. UPDATE : Several readers have pointed out that lithium batteries in storage or ultra-low power operation may develop a passivation layer after a year or two, which will artificially increase the cell's IR. The way to get rid of the the flower expert by dr dg hessayon passivation layer is to drop a high load on the cell till the battery's voltage recovers. Help 100%? Some info on-line suggests that only certain kinds of lithium cells suffer from this but information is sparse. This link describes the situation. So the advice above is good: wake up in a low-power mode as described, but if it's early in the cell's life and a high IR (low voltage) is expert by dr dg hessayon found, drop a heavy load on the cell till it recovers. This could be done by powering up a transmitter or doing a flash write. Be cautioned, though: don't apply a load so high that the MCU crashes.
7 - Dropping Vdd to Cut Current and Increase Battery Life. When trying to maximize the amount of causes of peloponnesian war essay energy one can get from a battery powering an MCU it's important to remember that we're interested in current, not power, since battery capacity is measured in mAh. The equation for power has a hugely-seductive V squared term, but when we're (correctly) thinking about current, voltage's effects are linear. So, does it make sense to exploit current's linear relationship with voltage? Consider the following graph for one of TI's nifty MSP430 MCUs: The curves above show a substantial reduction in current as the expert dg hessayon Vdd decreases. Even at creative strategies for middle, 1 MHz, where the dg hessayon graph isn't very dramatic-looking, there's about a 2X improvement by non plagiarized, scaling back the MCU's supply voltage. So this sure looks like a great place to expert by dr dg hessayon, cut coulombs. It's tempting to put in the new common app essay a low-dropout regulator to reduce Vdd to 2.0, but I can't find any linear devices whose idle current during the MCU's long sleep states won't deplete the battery.
Smarter parts can work, like TI's $0.80 TPS 62736 buck/boost converter that needs only 400 nA for Iq. It does require an inductor, but those are only about 7 cents in quantity. Touchstone's TS3310 (now owned by the flower by dr dg hessayon, Silicon Labs) has even better specs. But long-lived systems are almost always asleep. A device that has to run for a decade off a coin cell will be snoozing well over term 99% of the time. The graph above is active current; cut that by half, and factor in the 1% or less awake time, and expert by dr it's clear that there's really no real benefit to scaling Vdd.
What about cutting Vdd during the 99% of the time when the processor is help sleeping? Most MCUs offer a number of sleep modes that each have differing energy needs. Some show a very small difference in worst-case consumptions; it's common to find in a deep sleep only a 20% variation between 3 and the flower expert 2 volts. Good Ways Essay? 20% may be enough to justify an extra dollar's worth of the flower expert by dr dg hessayon buck/boost parts as that could add a couple of years to for middle, the operating life of a very-low-power system. But remember that a ten-year life means the system's average draw from a CR2032 can't exceed 2.5 uA. The Flower Expert By Dr? The TPS 62736 will eat 400 nA of that budget.
One vendor shows curves for typical sleep needs, and there's about common questions, a 2X difference between 3 and 2 volts, which sounds promising. The Flower By Dr Dg Hessayon? But under 3V the curve is labeled limited accuracy. Combine the robert greenleaf servant meaninglessness of typical numbers with limited accuracy and I, for one, have no idea how to interpret the data. One wonders if the datasheet was created by marketing folks rather than engineers. Take it from us, in some modes, it's possible, based on by dr a statistically meaningless set of observations, that the part might, if coupled to the wings of angels, work in your application. Unfortunately, most datasheets don't spec out the difference in sleep current as a function of questions voltage, so it's impossible to know what benefits, if any, accrue from voltage scaling.
As always, read the the flower expert datasheets carefully and do a full analysis of your design goals. 8 - Most Brown-Out Reset Circuits Don't Work. Low-power MCUs usually have a built-in brown-out reset (BOR) circuit. Unfortunately, most are poorly designed and/or lightly documented and should not be used. One popular ultra-low power MCU, from a vendor who noisily advertises two to three decades of coin cell operation, has a BOR which is off by default. Creative Strategies School? On, it requires somewhere between 8 (typical) and 16 uA (worst case). The Flower Expert By Dr? Remember that, for a decade of causes war essay life from a CR2032, the system's average power draw cannot exceed 2.5 uA. Even if one were to foolishly use the typical number, the the flower expert by dr dg hessayon BOR by of peloponnesian war essay, itself will deplete the battery in just a couple of years. Another vendor, pushing extremely-low power ARM parts, rates the BOR at dg hessayon, 0.49 to 1.26 uA -- typical.
There's no max listed; there's not the slightest guidance of what statistical distribution one can expect when making thousands of systems. 1.26 uA eats half the good ways to start a university 2.5 uA budget. In another case the datasheet reads about the BOR: In the deeper sleep modes, this will contribute significantly to the total current consumption. As Deming said: In God we trust, all others bring data. They didn't, and it strikes me as risky to rely on by dr divine intervention instead of careful analysis. I'd be wary of writing strategies using these uncharacterized parts in long-lived applications. As always, read the datasheets pessimistically and the flower dg hessayon carefully.
When does the BOR interrupt occur? In some cases the voltage range is very wide; an creative strategies, example is an MCU where it is listed as 2.05 (min), 2.2 (typ), and 2.35 volts (max). Doing worst-case design you'd have to assume that the BOR may occur at 2.35 volts. The following graph is one I have used before; it shows the dg hessayon voltage a CR2032 can deliver as it discharges as a function of robert greenleaf load. The 10 mA load line is pretty common for an awake MCU with enabled peripherals; 30 mA is not unexpected if there's any sort of wireless comm going on.
The heavy red line is at 2.35 volts, the dg hessayon max value where we may see a BOR interrupt. Creative Writing Strategies For Middle School? Note that in expert dg hessayon this case the BOR circuit will signal a dead battery, if there's a 30 mA load, shortly after you ship the product. With a 10 mA load the battery-dead indication happens when there's still 31% capacity left. In other words, the BOR circuit is useless. A much better alternative is to leave the BOR off and use the A/D. Wake up from time to time, apply a load similar to what the system normally needs when awake, and read Vcc. If it's near 2.0, then signal a battery failure (or take whatever action your system needs in this situation).
If such a reading is taken once every ten hours (surely, more often than needed), and 10 mA were pulled for 1 ms during this reading, over a decade this eats only 0.03 mAh, or 0.01% of a CR2032's capacity. And, by manually reading the term A/D a more nuanced approach to the flower by dr, battery management is possible than by relying on a single, poorly-controlled, BOR voltage. How should you design the help system to protect it from well-meaning users trying to change the expert by dr dg hessayon battery? A typical coin cell battery socket looks like this: Inexpensive coin cell holder.
It's cheap, it's easy, it mounts well on a PCB, and it's a disaster. A confused user, poor instructions, perhaps a martini-induced brain fart, and an upside down battery will fry all of the sensitive electronics. I saw a system not long ago that used a small signal diode to insure the electrons flow in app essay the right direction. But that sort of a design is a catastrophe for by dr these systems. It takes 0.7 volts right off the top; as the battery discharges it's not long before there's not enough voltage to good ways, keep the MCU going, even though the expert battery is a very long way from being dead. Another design used a Shottky diode, as we all know these devices have a very low forward voltage drop. Anecdotally people talk about 0.1 volt, for some reason, which is the number I've heard engineers use routinely for decades.
But that's simply not true. Here's the forward voltage drop for the new app essay a typical Shottky diode: Shottky diode forward voltage. Sure, you can expect 0.1 V or so. at the flower, 0.005 mA! At more realistic currents (10 to 30 mA or so) that jumps to 0.4 V at room temperature. If the protection diode drops 0.4V, then once the battery drops below 2.4V the system gets 2.0V. It can no longer provide enough voltage to keep the MCU alive. Remember the graph that showed typical voltage from a CR2032 for causes of peloponnesian war essay various loads?
This is the expert same plot with a red line at 2.4V. The useful battery capacity with a diode is above the red line. Once the battery voltage falls below the red line the MCU will be starved for electrons. In the of peloponnesian case of a 30 mA load pretty much the entire capacity of the battery is the flower expert by dr dg hessayon lost. Even with a 10 mA load over the new app essay half the battery is expert by dr unusable. A much better solution is a one that won't properly engage the battery if the help 100% non plagiarized cell is inserted backwards. The following part from the flower expert by dr, Memory Protection Devices is a good example: A better coin cell socket. The contacts are arranged such that the negative terminal simply will not be connected unless the battery is installed correctly.
It's $0.25 more than the term paper help 100% non plagiarized socket shown before. But if you care about the customer experience, use a socket that will simply leave the system unpowered when the the flower by dr battery is inserted backwards. Bob Snyder sent me the UL rules for using coin cells in products. There are a number of requirements that must be met to obtain UL approval in devices with user-replaceable batteries. Common Questions? For instance, the the flower device must be marked Replace Battery With (Battery Manufacturer's Name or End-Product Manufacturer's Name), Part No. ( ) Only. Use of another battery may present a risk of fire or explosion. See owner's manual for safety instructions . I have never seen this on any product that uses coin cells. UL mandates that it's either impossible to install a cell backwards, or that preventative safety measures of the type explored above be used. In many applications coin cells are used just to maintain RAM's contents when the mains power is down. UL is very concerned that the battery cannot be reverse-biased when the power supply is robert feeding memory, so requires that either two series diodes, or a diode with a current-limiting resistor, be placed between the battery and the rest of the circuit, as follows: Why two diodes?
UL's ultraconservative approach assumes one may fail. The resistor is to limit current if the diode in expert dg hessayon that circuit shorts. In most cases the robert greenleaf essay servant leadership first circuit won't work; even two Shottky diodes will drop about 0.8 V (as shown earlier), so RAM likely won't get enough voltage to maintain its contents. The second circuit requires a resistor that limits reverse current to a UL spec of 25 mA for most coin cells. But how is one to compute the proper resistance? You need to know the battery's internal resistance (IR) when reverse-biased, and expert dg hessayon I cannot find any documentation about that.
There are some crude published data on IR when forward-biased, and in this document I've shown lots of empirical data from my experiments. One could assume the term non plagiarized battery's IR is zero, which would certainly give a nice worst-case result, but I decided to explore this a bit more. I applied a power supply to a CR2032 and measured the current flow when the supply's voltage was 0.5, 0.75, and the flower expert by dr 1.0 volts above the battery's unloaded voltage. To Start A University? The battery was contained in an explosion-proof container. Expert Dg Hessayon? Well, actually, an robert, old coffee can, but it sure would have been fun to the flower expert, hear a boom. Alas, nothing exciting happened. From that it was easy to causes of peloponnesian, compute IR, which is displayed in the flower expert by dr dg hessayon the lower three lines on the following graph: (I took data every minute for the first 8 minutes, and at 5 minute intervals thereafter. The dotted lines are trendlines.) Strangely, the internal resistance spikes immediately after the ways to start essay power supply is applied, then quickly tapers off.
In a matter of minutes it falls to six to eight ohms. The data is very similar for the flower dg hessayon when the power supply was 0.5, 0.75 or 1 volt above the cell's unloaded voltage; that's not unexpected if one assumes this really is resistance and not some complexity arising from the chemistry. The top three curves are the battery's temperature. Unsurprisingly, temperature goes up with the voltage difference. Given UL's dire warnings about catastrophic failure I expected more heat, but the max encountered was only about 50 C, far lower than the 100 C allowed by UL rules. Now, this data is for a single battery, so be wary, but it does conform to the IR characteristics I measured for forward-biased cells. Probably the only decent solution, if you don't want to use a socket as described above, is to use a FET to protect the circuit if the battery is installed backwards.
TI has a nice application note about this. This leads to another question: to get more capacity, can we parallel two or more coin cells? UL is silent on term paper help non plagiarized the subject. I suspect that, since their argument is that reverse-biasing a battery is by dr bad, that they would require diode isolation. Greenleaf Leadership? As we've seen, diodes eat most of the effective capacity of a cell, so should be avoided. This is a debate that rages constantly in my community of ocean-sailing friends. The systems on our sailboats run off large, often lead-acid, batteries. The Flower Dg Hessayon? On my 32 foot ketch, the fridge sucks 50 Ah/day, the autopilot another 50 Ah, and the radar, well, at 4 amps we don't have the power to leave it on all of the time. All of writing strategies for middle this comes from by dr dg hessayon, two 220 Ah six volt golf-cart cells wired in series.
After a day or so of running the systems we have to fire up the engine to recharge, which everyone hates. Writing Strategies School? Can we wire two banks of golf cart cells in parallel? I have heard all sorts of arguments for and against, but many do wire their systems that way and get good results. What about coin cells? My experimental data shows that the maximum difference in unloaded voltage for fresh CR2032s is about 0.25 volt. This is true for a single brand and between brands and lots. With two paralleled cells of unequal initial voltages, the lower-voltage battery's small IR will discharge the higher-voltage cell rapidly until both batteries are at the same voltage. LiMnO2 cells have a very flat discharge curve till they approach end of life.
Discharge one by a quarter volt and the flower by dr dg hessayon you have lost around 200 mAh of good a university essay capacity, or about 90% of the by dr cell's 220 mAh rating. Causes Of Peloponnesian? So the battery with the higher voltage will quickly run down to 10% reserves. By Dr? Most of its capacity is thrown away. But it gets worse. Once heavily discharged the battery's voltage is at a knee on the curve and falls rapidly. The one that seemed better, with a higher voltage when first installed, now acts as a load on strategies school the other! They essentially suck each other dry. So don't put these in parallel. Suppose one applies a fixed load to a coin cell for the flower expert by dr a short period of time. Does the battery voltage change?
That's a special case of a broader question: everyone uses internal resistance (IR) to essays knowledge information age, characterize these cells. Is IR really an accurate way to model their behavior? For this experiment I discharged 9 CR2032s. Most of the time there was only a 0.5 mA background load to run the batteries down, but every two hours the test jig applied either a 10 mA or a 30 mA load for one second. That is, at the 2 hour mark the cells saw a 10 mA load; at four hours it was 30 mA.
The system read voltages immediately after applying the load, every 10 ms until 100 ms went by, and then at by dr dg hessayon, 100 ms intervals. Here are the results for to start 30 mA. The horizontal axis is time, but I left it unlabeled as it could be weeks, months or years depending on the discharge profile. Expert? The blue line is the battery's loaded voltage; other lines are the internal resistances during the one second interval: Note that the bottom red line is the mean IR for 9 batteries at 0 ms, immediately after slamming on the load. All of the other data points are pretty tightly grouped.
In other words, the IR goes up significantly (about 10%) milliseconds after the load shows up, but there's little change after that. In other words, IR is not an app essay questions, accurate model of coin cell behavior. It's not bad; for the flower expert by dr an engineering analysis it's probably close enough. But there is some other effect from the battery chemistry going on. The results are clearer with less data.
Here the red line is the IR at 0 ms; grey is at essay, 10 ms, and yellow at 1 second: Especially nearing the end of life we can see a big increase in IR from 0 to 10 ms, but not much more from 10 ms to 1000 ms. Yes, the the flower expert effect is different when the ways to start battery hasn't run down too much, but then the expert by dr voltage is higher and IR is so low the the new questions increasing IR isn't particularly important. With a 10 mA load the results are about the same: The bottom line is that the voltage the MCU sees when it first wakes up is the flower by dr not that which will be there mere milliseconds later. Paper Help Non Plagiarized? Figure on another 10% drop, on top of all of the losses detailed earlier. May, 2015 Update: I'm told this is due to the flower by dr, electron migration within a cell. Electrons pool on an electrode; when a load is in the applied these pooled charges are the first to the flower expert dg hessayon, be drawn off. Essays Knowledge? It's as if there's a bit of capacitance involved. Quite a few people have written asking about using watchdog timers (WDT) in by dr dg hessayon battery-operated systems that achieve years-long life by robert servant leadership, snoozing 99+ percent of the time. The system may be dead to the world for hours -- how does one service a WDT when the code isn't running?
Why would you want to? How can the software crash when it's not running? The answer is that the code can fail while awake and accidently enter a sleep state. Running the WDT during sleep insures the system will recover. One could wake up once a minute or so and tickle the watchdog. Generally that only requires a handful of instructions. Even when running from a 32 kHz clock (typical for ultra-low power sleep modes) the tickle will only need a ms or so of awake time. If the MCU consumes 50 uA while servicing the WDT that's just 7.5 uAh per expert dg hessayon, year of operation. Given that a CR2032 coin cell has about causes of peloponnesian war essay, 220 mAh of expert dg hessayon capacity, the energy needed for managing the WDT is insignificant.
But the reality is a bit more complex. We have to work with real parts, not idealized devices. I looked at greenleaf servant, a typical microcontroller from the flower by dr, Microchip, picked at random from their incredibly diverse selection of XLP (extremely low power) devices. The PIC16LF1704/8 is a nice 8 bitter with gobs on causes of peloponnesian war essay on-board I/O, including a watchdog timer. In the expert low-power sleep mode the WDT consumes 14-17 uA. I started engineering when a microprocessor needed a huge honking power supply, so this is an incredibly small number. But it's too much for long-lived coin cell operation.
That compendium I referenced demonstrates that for 10 years of life from a coin cell the essay average current consumed can't exceed 2.5 uA. That watchdog is unusable in this environment. (I didn't do an exhaustive search; possibly other MCUs from Microchip have lower-current WDTs. And I commend them for publishing these worst-case numbers; too many other vendors don't.) A competing MCU from TI, the the flower dg hessayon MSP430F11x1a, takes only robert essay 1 to 3.4 uA in the lowest-power sleep that still has an oscillator running (to support the WDT). By Dr Dg Hessayon? Nice, but 3.4 uA is far too much for these applications. The better figures assume Vdd is 2.2 volts and causes war essay it's not hot.
No incremental current is listed for turning on expert the watchdog, which suggests that is causes of peloponnesian included in the flower dg hessayon these figures. However, the user's guide reads When the watchdog timer is not required, the WDTHOLD bit can be used to hold the WDTCNT, reducing power consumption. That sounds like there is some, undocumented, hit for using that peripheral. Causes? Is it a nanoamp or do you have to run jumper cables to a car battery? Sans data engineers are left adrift. Other vendors are equally vague. Since the code can't crash while sleeping, leave the the flower dg hessayon WDT turned off during those long periods. Good? Enable it while awake. The Flower Dg Hessayon? Running, a crash will be mediated by the operating WDT.
The upside of this approach is that, since the MCU is awake for such short periods, the current consumed by the WDT is the new app essay insignificant and won't drain the battery. While awake, of course, a crash could vector to the code that disables the watchdog before going to sleep. Instead, structure the code to initialize a variable to the flower by dr, a known value, and add offsets to about in the, it while running. That could be done in functions that are always called. Before executing the SLEEP instruction check to see if that variable contains a value that indicates the code executed correctly.
Take recovery action if the variable is not correct. Or, if basically the same code runs during each awake cycle, use a timer to expert by dr dg hessayon, measure execution time; error if it deviates much from nominal. There are other failure modes. Creative Writing? The firmware could be perfect, but an external event -- EMI or a cosmic ray impact -- may scramble the the flower expert by dr MCU's neurons. Perhaps the program counter gets altered. When the MCU wakes up it will resume operation at a random address without re-enabling the WDT. Or maybe the event flips a bit in the sleep logic so the microcontroller never wakes up.
Essentially, one would need a watchdog that operates during sleep times to term help 100%, counter these threats. Internal WDTs use too much current. Readers have suggested two TI parts: the TPL15111 timer (beware of footnote #4 in the flower expert by dr dg hessayon that datasheet), and the new common app essay questions the TPL5010. This report uses the results of extensive experiments, plus analysis, to dg hessayon, prove that most assumptions about designing ultra-low power systems are wrong. Among the knowledge age most important findings: Sleep current is almost irrelevant. What matters is time spent sleeping. . and contributions of other leaks and drains. The internal resistance of coin cells increases hugely as the battery is discharged.
Don't wake up at by dr dg hessayon, full speed! Check the voltage as you ramp up frequency. Don't use the on-board brown-out reset circuits. Droop will trim another 10% or so of servant leadership battery capacity. From a practical standpoint, it's impossible to use a capacitor's time constant to boost Vdd. Successful low-power design requires careful analysis of every component used. Even poor decoupling capacitor selection will drain a battery in short order. I doubt anyone will get 10 years from a coin cell even with the the flower expert dg hessayon most careful design practices. The bottom line is to apply careful engineering judgment to in the age, all design decisions.
And test your design. You know the IR will go up as the cell's voltage declines. Power your system from a power supply fed through a pot, and turn that pot up to simulate a cell's IR. Run the system through sleep and wake modes, as well as brown-out-reset, to the flower dg hessayon, insure it will still operate correctly even as a battery approaches end of life. Do you need to eliminate bugs in your firmware? Shorten schedules? My one-day Better Firmware Faster seminar will teach your team how to operate at a world-class level, producing code with far fewer bugs in robert greenleaf leadership less time. It's fast-paced, fun, and covers the the flower dg hessayon unique issues faced by 100%, embedded developers. Here's information about how this class, taught at your facility, will measurably improve your team's effectiveness.
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The Flower Expert, The world s best-selling book on flowers by Dr D G
A Kabbalistic Guide to Lucid Dreaming and the flower by dr dg hessayon, Astral Projection. Director of Research, ORA Project , The Philosophers of Nature (PON) Copyright 1997. All Rights Reserved. The projection of consciousness has been an integral part of robert essay servant leadership, kabbalistic teachings, from the Merkavah (Chariot) Riders and their journeys to the starry Palaces ( Hekelot ) of the invisible world, to Traveling in Spirit Visions with the early adepts of The Hermetic Order of the Golden Dawn in the 19 th can early 20 th centuries. While a wide variety of the flower expert by dr dg hessayon, approaches has been formulated to to start a university, assist the disciples of the flower expert dg hessayon, these diverse schools, much of their techniques require an extensive amount of preparatory teachings and/or ritual assistance. For those who have little or no knowledge of traditional 10-12 th century Merkavah doctrines, or no interest in learning the necessary signs, symbols, and robert essay, invocations for Golden Dawn style techniques and their ‘spin offs’, yet want a Hermetic approach to their inner world, there is a solution. It is also simple, direct, and does not require an extensive amount of visualization or creative imaging. Expert Dg Hessayon. The following experiment was carried out over a three month period, from December 1996 to February 1997.
During that time, no additional ritual methods were performed, either for personal development, or in a group, in order to asses the value of the help 100%, technique as it stood alone. The majority of the experiments occurred at night, before going to expert by dr dg hessayon, sleep, and about half the time, in the morning upon waking, while still in a borderline state. It is designed for those who would like to have an ‘out of body experience’ but lack either the necessary visualization skills required of so many of the present techniques, or who have had violent experiences leaving their body, and paper non plagiarized, would like a more gentle approach to the astral planes. It can be carried out by either experienced ‘traveler’ or beginner with equal ease, and possibly, similar results. The theoretical background behind this experiment is strictly kabbalistic, and is applicable to either the traditional Tree of the flower dg hessayon, Life (Golden Dawn), the revised Tree of Life as applied to the Portae Lucis material, 1) or the Palaces as outlined in the Sepher Zohar . Robert Greenleaf Essay Servant. In short, any systematic outline of the interior body-world of humanity can be applied, as long as it has concise, easy to the flower by dr, visualize symbols for the various planes of consciousness. The working assumption is that we as conscious beings originate in the Ain Soph Aur , or Limitless Mind of God. We incarnate through various stages of increasing density and matter, into the present world, in order to gain the information, experiences that will allow us to go from ‘potential beings’ into Self Actualized, or Self Created Beings.
In our journey of by dr dg hessayon, development we take on characteristics and ‘bodies’ of various vibrations, and on our ‘return’ we shed these bodies in exchange for increasingly subtle bodies and worlds of Light. These Worlds are categorized in the Gnostic, Kabbalistic, Hermetic, and Alchemical texts under different names and numbers, but share the same essential qualities and greenleaf servant leadership, functions overall. That is, they go from the most dense world of material Earth, to the most subtle of Infinity, or the point of the flower by dr dg hessayon, our origin, the Mind of the Creator. Within our physical body we have various organs of psychic perception, called psycho-spiritual centers in questions modern Western esoteric nomenclature, and chakras in Sanskrit. These centers correspond to several levels of our physiology, that is on one level, our nervous system and plexus, as well as our endocrine system of the flower expert dg hessayon, hormone secreting glands. Other correspondences exist as well, but for our purposes these are the ones used most commonly and efficiently. Astral projection is often suggested through the solar plexus, but for many this can be an unnerving and unsettling experience. Other suggestions are purely visual, such as rising out of your body like a mist, or as having a second ‘body of causes of peloponnesian, light’ present next to your physical one.
It is said that advanced practitioners can project their consciousness at the time of their death through the upper centers, thus ‘dying consciously’. The centers suggested here are the top and front of the expert dg hessayon, head, or the “Crown” and “Third Eye” centers, associated with the pineal and pituitary glands. Some even use the back of the head, the medulla oblongata, or brain stem. In the of peloponnesian war essay, Indian texts, each chakra is expert by dr associated with a particular power ( siddha ), which is awakened in the aspirant, and as such, allows the student to then project their consciousness through the different psychic centers in increasing complexity and subtlety, until finally, the Crown is reached. In kabbalistic practices however, the centers are rarely used as such, but instead intense visualization of the etherial Worlds is the new common used, until they are progressively realized, or rituals combined with more generalized energizing of the psychic body are used, alone or in conjunction with these visualized worlds. The modern variation of this often involves the use of Tarot cards, and is called Pathworking, or the use of the flower expert by dr, Hebrew letters. Eastern Orthodox monks have used intense visualization on the solar plexus, as a small sun, as a method of achieving exteriorization, and ways, some schools use the heart as a center of displacement, however, the previously mentioned methods are the most commonly used to date. Alchemists use tinctures, or medicines to assist in the projection of consciousness. Although, these should not be confused with hallucinogenic, or psycho-active drugs. The effects of alchemical medicines generally occur when their user is dg hessayon relaxed, sleeping, or in meditation.
They in effect, assist the projection of consciousness, that is the good ways essay, expansion of awareness, rather than induce or cause it directly. The Flower Expert. It is possible to take an alchemical medicine and drive a car unimpeded. In Eastern techniques, the number of psychic centers attributed to the body vary in number depending on the school in question. In general, it is said that we have at least seven major and five minor psychic centers. Location, color attributes, mantras, or vowel sounds attributed to them however vary considerably. 2) According to Sri Aurobindo, the throat center is strategies school associated with the externalization of mental forces, and the link between the higher and by dr, lower mental spheres. Like in some color scales of kabbalah, grey is associated with this center.
3) In Serpent of Fire: A Modern View of Kundalini , Darrel Irving points out that the essays about knowledge, Vissudha chakra is presided over by the dual deities of Shakini and Shiva . Each is expert five faced, representing the essay servant, five Elements, and three eyes, showing physical and psychic perception, or knowledge. Shakini is seen as Light itself, and Shiva, like the Hermetic ideal, is androgynous, half white and half gold. By Dr. The center is associated with the writing strategies for middle, purification of intelligence, the psychic substratum or ether ( akasha ), and hearing. The Flower By Dr Dg Hessayon. The color given is smoky-purple. As with Sri Aurobindo’s color, purple is also sometimes given as associated with the throat center in causes modern kabbalistic works. 4) Along with the remaining upper two psychic centers, these three constitute the only centers whereby direct psychic perception is possible. 5) In the West, the Throat center is less well defined, although it shares in all of the above named characteristics. In Kabbalah of the Golden Dawn , Pat Zalewski states that the throat center is associated with the thyroid gland and controls respiration. As with yoga, each of the preceding centers is associated with an Element, starting with Earth, Water, Fire, and Air.
While not stated, it might be presumed that the Throat center is the flower expert dg hessayon then the first center to help 100% non plagiarized, be associated with Spirit, or Quintessence, as in yoga. Expert By Dr. Here however, we run into a problem regarding the good a university, attributes associated with this area. In alchemy, the the flower expert by dr, throat is the new common questions ruled by Mercury, the god of Air, as well as magic, voice, and initiation. In the expert, systems generally used (i.e. Paper. Golden Dawn), no planetary attribute is given to the throat.
Instead, it is the sepherothic realm of Daath that presides over this region. Daath is Hebrew for ‘knowledge’ and maybe that is the best attribute for things associated with the mind, speech, and magic. However, for the flower by dr dg hessayon, many kabbalists, Daath is a region better left alone, and feared more than the so-called Qlippoth, or Demonic realms. About Knowledge Information Age. How did Daath come to dg hessayon, be seen with such awe? Mostly from the second-hand reports of book learned occultists repeating what they read. Although, if we keep in robert greenleaf leadership mind that Daath is Knowledge , then some interesting correlations can be drawn. Israel Regardie states:
“This central point between two symbolic pillars of the opposites, the place of balanced power from expert by dr dg hessayon, which the working of the opposites may correctly be viewed, is the implication of DAAS , which is the name of this shadowy Sephirah. Rightly it is causes of peloponnesian war essay shadowy, and the word is used advisedly for in the majority of the flower expert dg hessayon, us who have not cultivated the paper non plagiarized, difficult art of avoiding the opposites, the development of this new principle has proceeded with the utmost slowness. It is a new factor of adaptation or equilibrium, especially between the two broad divisions of consciousness — the ego on one hand with its desire for adjustment to modern life with its refined and non-natural conditions, and on the other hand with the superficial level of the instinctual life, concerned with primitive things, of self-assertion and the flower by dr dg hessayon, the unbridled gratification of its every whim and caprice.” 6) “DAAS (sic), the shadowy Sephirah, which develops in the new app essay the course of evolution as we learn the domination of the flower dg hessayon, our mental and emotional propensities, is situated at the nape of the ways, neck. Its position is at the flower expert by dr a point on the spine just below the occiput, about one or two inches above the larynx, and its diameter may be imagined to be about four inches in extent. It is ways a university conceived to be a symbolic link, self-induced, and self-devised, between the the flower dg hessayon, higher Genius on the one hand, and on the other, the ego, the term non plagiarized, consciousness self referred to that group of characteristics clustered around TIPHARAS (sic).” 7) Regardie also refers to Daath as “The Link” between the Higher Self and the ego, or waking brain. Gareth Knight states that Daath is where ‘pure force takes on the flower expert by dr dg hessayon form” 8) and that it is “the highest unity in the world of forms” 9) , and “Daath is the highest point of creative writing strategies for middle, awareness of the human soul regarded as a soul…”. 10) “The Daath powers in balanced function, of course, give the type of person with a mission or sense of destiny who will have sufficient detachment to cut his way through any obstruction to his aims, at no matter what cost, and who has absolutely no concern for what danger the future may have in store such is his faith in the flower expert dg hessayon his powers and acceptance of his destiny.” 11) Unfortunately, most of what is said regarding Daath, like the other spheres, is of a cosmological nature, and difficult to apply to our individual consciousness. The abstract ideas associated with it, coupled with vague warnings and causes of peloponnesian, trepidation are not directives on how to approach this sphere within our psyche ( and very real psycho-spiritual, semi-physical center!) in a positive and growth oriented manner.
Possibly what Knight is saying, on a personal level, is that the psycho-physical sphere associated with Daath allows for the highest awareness in human consciousness when it is progressively opened. When this occurs, many of the fears, obstructions, and psychological malfunctions that have previously plagued us, fall away under the intense awareness of our true power and presence as Beings becoming consciously Divine. In summary, maybe the fears are real, in that once we cross the Bridge of Knowledge, there is no turning back. Once we go from the theoretical to the experiential, we cannot return to ignorance. When innocence is expert lost, it is gone for good. Causes Of Peloponnesian War Essay. Thus, we can cross the ‘bridge’ several times: from the material world to the psychic; from the psychic to the more abstract mental realms; and from the mental to the highly spiritual, from which none is said to have returned. Most of what is dg hessayon reported about Daath may be in relation to this last and highest reality. The function of this technique, is to assist those who desire it, to cross their personal psychic bridge from the visible into the invisible with consciousness and common app essay, memory. Mercury, Hermes and the Psychopomp.
Knight suggests using the caduceus, a symbol of the god Mercury, and the psychopomp Hermes, as a symbol for approaching Daath. This relationship of the Throat Center to Mercury must not be overlooked, for dg hessayon, it is this very relationship that we are seeking to establish within ourselves. Good To Start A University Essay. To be able to enter into the psychic realms with the the flower expert, aid and assistance of our Higher Genius, as well as our human intellect, and to make use of the information upon creative strategies for middle return to waking consciousness. We want, in effect, to do as Hermes does, “Walk Between Two Worlds” and unite them within our psyche. The symbols for expert by dr dg hessayon, Mercury is the stylized caduceus in the form of the combined symbols of Luna (Moon), Sol (Sun), and Terra (Earth). Good Ways A University Essay. Combined they state the function of this part of our psychic anatomy. The upturned lunar symbol represents our brain, nervous system, and psychic functioning, resting upon the Solar symbol beneath. The Flower By Dr. The Sun, is our spiritual powers, life force, and intuition.
It sits astride the symbol for matter, or the equal armed cross. The Cross of the Four Elements is the symbol of material existence, and is at once our physical bodies as well as the material world we live in. In the symbol for questions, Mercury, we see that the terrestrial energies, or matter, are dominated, by the Solar forces of the Sun, and Soul. However, these spiritual forces are in expert dg hessayon turn dominated by the intellect and physical brain of man. That is, the brain directs them, or represses them, depending on the spiritual health of the aspirant. It also illustrates a unique point. That is, the relationship between the heart, sun, brain, and spiritual awakening. As messenger of the gods, Mercury assists in the transfer of knowledge, and not in the creation or interpretation of that knowledge, these functions being left to the brain and psychic heart. The heart is the seat of intuition, the Voice of the essays knowledge in the, Soul, and the flower, the Interior Master, only through its awakening can we become conscious and free beings. However, the energy of the the new common app essay, awakened heart, with all of its love, must be transferred to the physical brain for insight and understanding.
In doing so, it requires the assistance of the Throat center. Once in the brain, the energy must also be able to return to the heart, or send information there for spiritual consideration, via the Mercurial Center. Herein lies some confusion for some folks. It is said that the heart is the expert by dr dg hessayon, center of essay servant, intuition, yet it is in the pituitary body of the physical brain that intuition is expert by dr dg hessayon realized in common app essay mundane consciousness. Is it not possible to simply awaken the pituitary body without the needed functions of the psychic heart?
The answer is the flower expert by dr yes. To understand this somewhat confusing relationship between the heart, pituitary gland, and our spiritual awakening, we need to essay leadership, realize that according to esoteric tradition both of these organs are Solar in expert nature, and about knowledge age, as such effected by the material and spiritual Sun. Just as the pituitary gland reacts to the flower expert, physical light, it also reacts to help non plagiarized, the awakening of the spiritual light caused by an awakened Heart — a Heart filled with love. The brain in general is Lunar, but certain aspects of expert dg hessayon, it respond to other planetary influences in their specific functions. This need to awaken both the heart and brain, is what is required for the new common questions, travels through the psychic realms. An awakened heart with no brain is subject to an extreme lack of practicality; and a brain with no heart can function psychically, but only in a cold and expert dg hessayon, detached manner. The ‘thinking heart’ and ‘feeling brain’ are what Mercury help us to establish. In doing so, the polarity is overcome through union and causes of peloponnesian, the material and remaining psychic forces of our body are brought into by dr, play in a harmonious manner. The use of of peloponnesian war essay, blues, and purples is said to show the relationship between Daath, and the ideas of a Higher Mind (Blue/Chesed) and Yesod (Purple). Expert By Dr. Thus, the Daath , or sphere of Knowledge that we are contacting through our meditations is our personal one, and term 100% non plagiarized, not that of the transpersonal or Cosmic Daath on the Tree of Life, of which so many dangers have been written and attributed. It is expert by dr dg hessayon also the synthesis of the Supernal Upper Trinity in a form we can approach and understand more easily.
12) Also, if Yesod, or the gateway and principle sphere of the astral realm is a reflection of Daath “on a lower arch” as our British fraters and sorors are so fond of saying, then meditations on the “Daath” sphere in essay servant leadership ourselves should not only sublimate the sexual creative powers of Yesod, but also allow us to enter into expert dg hessayon, astral consciousness more fully and completely. Some Additional Thoughts From the writing, East. In Chinese and Mongolian Chi Kung, meditation on the throat center is used precisely for these purposes: (1) sublimation of the sexual force 13) , and (2) assisting in the conscious projection of consciousness and the induction of lucid dreaming. It is the connecting center between the heart and the brain. “Taoists who practice Dream Yoga focus on the throat point when going to sleep so as to consciously cross the bridge between the waking state and the dream state. Being able to dream lucidly helps one gain greater control of one’s Chi (internal energy) and expert, also enables one to consciously bridge the gap between life and death.” 14) Conscious dreaming is used to awaken the “Seventy-Two Magical Abilities”, in order to prepare them for eventual transfer to the waking, material world. This is an interesting number, as it matches the creative, number of permutations of the “Great Name” of God, or Shemhamphorasch . Theoretically, each of these Names, Signs, Seals, and correspondences 15) could be awakened using the technique outlined in this article.
As in India and Western techniques, the throat is associated with air, spirit energy, and consciousness in Taoist practices. The Philosophers of Nature 16) suggest three methods of projecting consciousness: mental, astral, and the flower expert, ethereal projection. The first technique suggests using the Throat center for essays in the, projection, and states that the dis-alignment of the physical and psychic bodies will occur at the level of the neck. It is this basic idea that the following experiment is based upon. In order to present the subconscious with an orderly supply of symbols in a coherent and meaningful manner, the use of either the Hindu Tattwas, Alchemical Elements, or Kerubic Signs can be initially used. Afterwards, the planetary signs of the seven principal planets are used in their place. This progressive use of the same symbols allows the by dr dg hessayon, subconscious to understand that these symbols are meaningful and are the essays about information, official means of transferring consciousness from one level to another. If done repeatedly, the symbols will not be needed after a period of time, and if done with good heart and mind, one may potentially realize their ‘interior level’ during one of the dream states provoked.
While full-scale astral projection may not immediately occur, the degree of lucid dreaming, dream memory, and the flower expert, even a limited increase in about information age one’s ‘magical voice’ will be experienced. It is up to each aspirant to make the most of these ‘out-of-body’ dream states, and increase their level of intensity so as to realize full and controlled projection of consciousness. Unlike other methods of projection, through regular practice, the method outlined here will in most cases work gently and progressively, i.e. increased dreaming, then lucid dreaming, and finally astral projection, thus allowing for an acclimation of consciousness to these new states of being. Step One — Obtain a set of symbols for the Four Elements and Spirit, and the flower dg hessayon, the Seven Planetary Signs. Start with Earth, then progress to Water, Air, Fire, and Spirit as the days proceed. The basic procedure will not change, only the symbols used to attain projection. Therefore, it is best to use symbols that you can easily visualize, either in gold, phosphorescent white, or their complementary colors.
Step Two — When going to sleep, or even just relaxing a few minutes, turn your attention to the area of your ‘Adam’s Apple’ and imagine a brilliant blue-black (or indigo/ultra-violet) sphere there, about the size of a tennis ball. Make it brilliant and translucent, as though it were illuminated from the inside, with its center point around the app essay questions, thyroid gland. It should be large enough to also touch the back of the nape of the neck, and if done very large (as Regardie suggests), 17) it may even have its farthest edges at the bridge of the nose and brushing the thymus gland, or heart. What is important here, is that the image is three-dimensional, and not just as a flat plate in front of you. Thus, the sphere, or ball, will encompass your neck, and parts of your head.
Your imagination is internally directed. It is alright to imagine the organs mentioned if it aids in dg hessayon visualization, otherwise, stay with the bright, translucent color and imagine that this is all there is, lose yourself in it. Place yourself in its center, look around at an infinity of singular color of slightly different shades and hues. Step Three — After achieving familiarity with the first step, and can enter into the indigo sphere at will, and be comfortable there, imagine your chosen symbol for the new app essay questions, Earth present with you. See it brilliant and before you, with the qualities of Earth present, that is heaviness, and expert by dr dg hessayon, density, and simply stay with the symbol for a while, or until you fall asleep. Do this one for five to seven days, then move on to start to the remaining symbols.
After you have completed all of the the flower expert dg hessayon, Elements, including Spirit, then proceed on to the Planetary symbols. Step Four — With the planetary symbols you have several choices on how to approach. First, you can simply move through them, starting with Luna, and progressing up the Tree of Life. Second, you can start with Saturn and progress down. Third, you can simply alternate through them according to the ruling planet of the day. Since it is desirable to spend several cycles with each symbol, the Third method offers the easiest and the new questions, least tedious way of working through them without worrying about breaking off in the middle somewhere and having to start that symbol over again. Note your experiences in your daily notebook and see what if any connections exist from week to week between the symbols of each planet. It is the flower expert by dr desirable to spend at least five to good ways to start a university essay, seven cycles with each planetary symbol, or between six and seven weeks working with them as you fall asleep.
This, added to the previous four or five weeks working with the the flower by dr dg hessayon, Elements, makes a total of ten to twelve weeks of nightly work. Upon rising in the morning, a minute or two can also be spent visualizing the greenleaf essay servant leadership, symbol of that day as well, as long as you don’t fall back to sleep! Those wishing to supply information regarding their experiences to the ORA Project may do so by sending a copy of their notes after the completion of the exercise to: Mark Stavish, M.A., ORA Project, Philosophers of Nature, P.O. Box 2920, Wilkes-Barre, Pennsylvania 18703-2920. Materials can not be returned and will entered into the research files of PON for future reference.
Please include a brief biographical sketch regarding your esoteric background, with particular emphasis on the flower expert by dr kabbalah, alchemy, and ritual magic, if applicable. ORA is the strategies, Occult Research and Application Project, and is designed to find new applications for existing Hermetic knowledge, as well as re-create and examine traditional knowledge and techniques for use in the contemporary world.
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