From what I searched, it&#x27;s dependant on your microcontroller, so there is no generic way to do this (since different Arduinos have different microcontrollers).<p>For a very low power project I had, I basically found a lib that did deep sleep correctly for my microcontroller (an ATTiny), then you sleep for a significative period of time each time (for example, 500ms), and check if the event happened when sleep ends. That results in a consumption under 10uA.<p>It is obviously very dependant of what you want to do, some applications can&#x27;t afford to check only every X ms.<p>And be careful too, you need to put everything possible behind your microcontroller, to be able to disable things during sleep (otherwise, you are just powering the rest of your circuit for nothing).