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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).

Sleeping Arduino - Part 5 Wake Up Via The Watchdog Timer

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. Sleep Modes on ATTiny85. When using microcontroller in battery-based applications we really need to look at current consumption.

Sleep Modes on ATTiny85

This will affect the power consumption and hence the lifetime of the device. This post shows some tests I performed to try and reduce the current consumption of an ATtiny85 AVR microcontroller using sleep modes and switching off various aspects of the IC when they are not required. The test results and code for th Arudino IDE is shown here. I needed a test circuit to check both the correct functioning of the different inputs and outputs and also for comparison of the current consumed when using different power modes. Test comparatif de la consommation électrique à vide de diverses cartes Arduino et compatible. Lightweight Low Power Arduino Library.

We have just release the 1st revision of our low power library for Arduino.

Lightweight Low Power Arduino Library

This is a simple and easy to use library that has the following features: Supports all sleeping mode of ATmega328P: Idle.ADC reduction mode.Power save.Power down.Standby.Extended standby.Selectable sleep duration: 15 ms, 30 ms, 60 ms, 120 ms, 250 ms, 500 ms, 1 s, 2 s, 4 s, 8 s, and forever (wake up using other resources) through on chip 125 kHz Watchdog timer. Using sleeping forever duration, the Watchdog timer module is not in use and will further reduce the current consumption by approximately 4 µA.Option to shutdown Analog to Digital Converter (ADC) module to further reduce current consumption.Option to disable Brownout Detector (BOD) module to further reduce current consumption by approximately 17 µA.

BOD module cannot be disabled through software in idle and ADC noise reduction mode. In idle mode, the IO clock is available for general IO modules usage. The library is available on our GitHub repository. Tout ce que vous pourriez vous demander sur la consommation d'une puce ATmega328p (puce d'Arduino) - Robot Maker. Consommation d'un Arduino, et optimisation d'un montage à base de ATmega328PJe vous propose ici un résumé d'un excellent article que j'ai lu sur le net.

Tout ce que vous pourriez vous demander sur la consommation d'une puce ATmega328p (puce d'Arduino) - Robot Maker

Je tiens avant tout à dire que tout ce que je vais présenter ici provient du travail de Nick Gammon, sur le lien ci dessous :Sur cette page de Nick Gammon, se trouve un post d'immense qualité sur la consommation des ATmega328P, et les moyens d'optimiser celle ci.Si vous comprenez l'anglais, allez plutôt lire l'original, et au pire gardez le lien vers ce résumé pour les tables, et formules L'auteur y mène une investigation poussée sur ce que consomme un Ardruino, puis surtout un ATmega328P sur une breadboard. Bien sur, le Arduino consomme plus que la version breadboard. [Résolu] Alimentation arduino batterie rechargée en solaire. En ce qui concerne la batterie, je ne me fais pas trop de soucis, elle peut parfaitement délivrer quelques ampères.

[Résolu] Alimentation arduino batterie rechargée en solaire

Là ou je m'inquiète plus, c'est pour ta petite plaque qui va charger la batterie et faire le 5V. Je vois très mal cette plaque délivrer 2A... elle ne va pas du tout supporter. En revanche, on y regardant de plus prêt, on voit que ton shield possède un module GSM M10E-04-NCH-STD. D'après sa datasheet, il peut s'alimenter entre 3.3 et 4.6V avec une tension préférée de 4.0V. How to Run an Arduino for Years on a Battery - Open Home Automation. If you found this article after doing a search on Google, welcome!

How to Run an Arduino for Years on a Battery - Open Home Automation

On this website you will find plenty of content around DIY home automation using open-source hardware. Enjoy the article! For most of the Arduino tutorials you will find on this website, power is usually not an issue as the Arduino is powered by the USB cable coming from the computer. However, sometimes you want to build systems that are going to be autonomous and powered by a battery. For example, you want to power the wireless motion detector just by using a set of batteries. The first thing we need is to build our own Arduino system with just the minimal set of components. Hardware & Software Requirements You need several components to build you own Arduino system. In a previous project I used a FTDI breakout board to program the Arduino chip directly on the breadboard. To power the Arduino, you will need a battery. You will also need several components around the chip.

Gammon Forum : Electronics : Microprocessors : Power saving techniques for microprocessors. Summary In this thread I show various power-saving techniques for the Atmega328P processor.

Gammon Forum : Electronics : Microprocessors : Power saving techniques for microprocessors

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 I am going to explore various power-saving options for running your project, presumably from battery power. These examples are specifically for the Atmega328P processor, but the techniques are pretty general. Summary of methods. Mettre en veille l'arduino pour gagner de l'autonomie.