luytendries

#include <avr/sleep.h> //Needed for sleep_mode
#include <avr/wdt.h> //Needed to enable/disable watch dog timer

void setup() {
  pinMode(0, OUTPUT);// LED connected to pin 5 which is recognised as pin 0 by arduino
  ADCSRA &= ~(1<<ADEN); //Disable ADC, saves ~230uA
  //Power down various bits of hardware to lower power usage  
  set_sleep_mode(SLEEP_MODE_PWR_DOWN); //Power down everything, wake up from WDT
  sleep_enable();
}