#include <avr/sleep.h>

void setup () 
{
  
  //SLEEP_MODE_IDLE: 15 mA
  //SLEEP_MODE_ADC: 6.5 mA
  //SLEEP_MODE_PWR_SAVE: 1.62 mA
  //SLEEP_MODE_EXT_STANDBY: 1.62 mA
  //SLEEP_MODE_STANDBY : 0.84 mA
  //SLEEP_MODE_PWR_DOWN : 0.36 mA
  
  set_sleep_mode (SLEEP_MODE_PWR_DOWN);  
  sleep_enable();
  sleep_cpu ();  
}  // end of setup

void loop () { }