#Power Management of Atmega-328p (Arduino nano) with RTC used for wake-up (DS3231)
This sequence displays the possibility to save power by keeping the processor in sleep mode. Following sleep modes are available:
SLEEP_MODE_IDLE
SLEEP_MODE_ADC
SLEEP_MODE_PWR_SAVE
SLEEP_MODE_STANDBY
SLEEP_MODE_PWR_DOWN
Wake-up is done by a real-time clock module (DS3231), which uses the alarm1 and an interrupt on pin PIND2 (INT0). In this particular case the wake-up occurs every minute, but it can be configured to wake up every second, minute, hour, day or date.
#Schematic
