Sunday, April 19, 2015

Reducing Arduino’s Power Consumption Part 4 (Turning Off the BOD)

This is the fourth, and most likely the last, in a series where we look at how to reduce your Arduino's power consumption. This series is great for anybody working on a project that is battery powered and you want to ensure the longest battery life possible. In this part we will look at how to turn off the Brown Out Detector (BOD) to save power.

************************Arduino Code*******************************************
/* This Arduino Sketch is part of a tutorial on the ForceTronics YouTube Channel and demonstrates how to use the Sleep cabilities on
Arduino as well as turn off the ADC to get low power consumption. In this tutorial the Extended Fuse on the Atmega was configured
to turn off the Brown Out Detection (BOD) for even further power savings. It is free and open for anybody to use at their own risk.

To turn off the BOD avrdude was used via the command prompt, the following command was used:
avrdude -c usbtiny -p atmega328p -U efuse:w:0x07:m

#include <avr/sleep.h>

void setup() {
  delay(6000); //Delay to see normal power level first
  sleep_enable(); //enable the sleep capability
  set_sleep_mode(SLEEP_MODE_PWR_DOWN); //set the type of sleep mode. Default is Idle
  ADCSRA &= ~(1<<ADEN); //Turn off ADC before going to sleep (set ADEN bit to 0)
  sleep_cpu(); //enter sleep mode. Next code that will be executed is the ISR when interrupt wakes Arduino from sleep

void loop() {
  // put your main code here, to run repeatedly: