RTC Light Timer Example?

[ScruffR]

You may want to look into this

Battery saving help

Actually I would not check for a specific hour alone. Imagine what is if your device wakes up between 3am and 9am for some reason? Then the device would not go back to sleep or if this happens at 2:59am, the device would wake again 59 minutes too late. Hence I’d do things slighty different Knowing that Time.local() returns the local date/time in seconds allows for easy range checks by use of the fact, that a day has 86400 seconds const int secGo2Sleep = 02*3600 + 00*60 + 00; // 00 minutes a…

You don't need to use System.sleep() but can do anything you want in that true or false branch.