Hi, I would like to build a device with a power button, the device will be plugged into AC outlet. I would like to be able to switch off the device after some time. I understand how to do that if I power my board from a battery. But it almost seems that I would have to have some part of my circuit …

Auto shut down AC Power

system December 3, 2012, 2:26am 6

retrolefty:
http://1.bp.blogspot.com/_f2TjoRrM27k/TD12YBkV2aI/AAAAAAAAAeQ/HZV8ehjlWk4/s1600/timer-switch.jpg

That would work, but I want microcontroller to determine what the timer delay is.

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