I'm trying to run arduino from 9v battery for as long as possible.
The arduino get's his input from IR sensor. He will get input once every few hours.
I want it to sleep till he get's an input from the IR sensor, and then wake up and do something according to the input, and then go to sleep again.
Is it possible ? I know i can send it to sleep, but how can he "listen" to the IR sensor while he is sleeping ?