Adventures in Low Power Land - SparkFun Electronics. Skill Level: Intermediate by Nate | August 09, 2011 | 32 comments I was working on a project called BigTime where low power operation was a necessity.
Here's a tutorial to show you some of the tricks I found to get the power consumption down to about 1uA (that's micro, not milli = 0.000001A). I'm pretty sure rubbing your fingers together produces more heat energy than 1 microamp. My overall goal was to get an ATmega328 to go to the deepest sleep possible, waking up only with an external INT button interrupt or with a 32.768kHz TMR2 overflow interrupt (for an RTC). Here's the example code that I used. Why is this important? Because we're playing with bootloaders and fuses, be sure to get a good hardware programmer and supporting software that allow for easy editing of the fuses. There must be better/smaller options out there but AVR Studio 5 is the only one that I know of that works seamlessly with my MKII programmer and the ATmega328. make clean make atmega328_pro8 Whoa. 1uA. 1) The DMM.
High-Low Tech – Programming an ATtiny w/ Arduino 1.0. This tutorial shows you how to program an ATtiny45, ATtiny85, ATtiny44 or ATtiny84 microcontroller using the Arduino software. These are small, cheap ($2-3) microcontrollers that are convenient for running simple programs. The ATtiny45 and ATtiny85 have eight legs and are almost identical, except that the ATtiny85 has twice the memory of the ATtiny45 and can therefore hold more complex programs. The ATtiny44 and ATtiny84 have 14-legs and more inputs and outputs. Lab3 - Laboratory for Experimental Computer Science.
Watchdog and Sleep functions This example shows how to make use of the Watchdog and Sleep functions provided by the ATMEGA 168 chip .
These functions are useful if you want to build low power consuming devices operated by battery or solar power. The reduced power consumption is achieved by through a intermittent operation of the system .In case of Arduino your main loop will be executed once before the system is put into the sleep mode. Low power ATmega/tiny with watchdog timer.
At work recently, the pranks have been escalating.
Raspberry PI ~ 18 : Construire une sonde de température radio pour 7€ Ce post est le dix-huitième d’une liste de tutoriels sur le raspberry PI, cliquez ici pour accéder au sommaire !
Faire du on/off c’est bien ! Mais contrôler sa maison en disposant d’indicateurs c’est mieux ! Aussi allons-nous voir, pour changer, comment construire un petit capteur qui va transmettre une information de température par radio au Raspberry PI. Si comme moi, vous vous interrogez sur l’intérêt de connaître la température d’une pièce en temps réel, je trouve personnellement qu’il n’y en a aucun, en revanche cela peut être très utile pour le Raspberry PI, qui pourra par exemple en dessous d’une certaine température, enclencher les radiateurs, on appelle ça des scénarios (on en reparlera dans un prochaine tuto) pour le moment, contentons-nous de récupérer l’information via une interface web et via notre interface vocale Yuri.
Avant tout, le traditionnel quart d’heure de honte en vidéo : (Le charisme d’une truite avec un double menton, un acteur né je vous dis !!) Le principe. HomePi – Test 01 – Lire une sonde avec l’arduino et communiquer avec le RaspberryPi. Bonjour à vous chers lecteurs geeks et moins geeks.
My first project. Notes on putting Arduino to sleep. I’ve been challenged recently with the need to minimize the power drain on my battery-powered Arduino project.
It seems I’m not alone and I found a bunch of great ideas on the web, and the solution I settled on involves the use of the AVR watchdog timer, and AVR sleep mode. The functions needed are available if you include the following header files in your Arduino code: #include <avr/sleep.h> and #include <avr/wdt.h> Before going any further, special thanks to these bloggers for providing the code, so the credit for the difficult works belongs here and here and here.
I’ve gotten about 3-5 days out of 6 rechargeable AA batteries powering an XBEE Pro, and a couple of sensors using this technique, and 5-7 days with a couple of solar cells for recharging. Also, the AVR 8-bit instruction set documentation can be downloaded here for those who want to dig in. After the includes, add these defines (used for clearing and setting bits, “sfr” is a special function register): Arduino, Zigbee and Embedded Development: Sleeping Arduino - Part 5 Wake Up Via The Watchdog Timer. OverviewWelcome to the fifth and final part of the "Sleeping Arduino" series, where we will cover how to wake the Arduino from sleep mode using the Watchdog Timer (WDT).
When waking your Arduino from sleep, you could use one of the standard internal timers of an Arduino as I have detailed in Part 4, but if you are looking for the maximum sleep time and/or minimum sleep power consumption, you have the use the WDT;As I have mentioned in this table, the WDT can give us a sleep time of 8 seconds, whereas the 'longest' 8/18bit timer will only give us a sleep time of ~4 seconds.Watchdog Timer (WDT)The Watchdog Timer on the Arduino's microprocessor only has one source to drive it: it's own separate internal 128kHz oscillator (as opposed to the 8/16bit internal timers, which can use either the 16Mhz system clock or an external clock).
The WDT also has a prescaler, which is used to configure the timeout period. It supports timeout periods from 16ms to 8 seconds: All parts of this series: Electronics : Microprocessors : Power saving techniques for microprocessors. Summary In this thread I show various power-saving techniques for the Atmega328P processor.
They include sleep modes, use of power-reduction registers, and other techniques. Applying all of them can result in a current draw as low as approximately 100 nano-amps (100 nA), well below the self-discharge rate of most batteries. Proof from the datasheet for the Atmega328P (page 405 of my copy): That is 100 nA at at 25°C running at 3v. These techniques would be useful for battery-powered devices where the full power of the processor was only required intermittently, for example a TV remote, calculator, doorbell, or some sort of environmental monitor where you only needed to check things from time to time. Introduction.