When building a microcontroller based project we don’t think much about power switch. Usually this is a simple switch that connects power on and off. More sophisticated designs may require smarter solutions like toggle switch. J.R. Stoner has been playing around with interesting circuit called Powach.
This is a standalone toggle power switch with built-in debounce and power LED indicator. Circuit is built using Schmit triggers and P-channel MOSFET. Switch can pass up to 2A of current which is enough in most embedded projects. The switch turns power on practically immediately, while turning off requires longer hols. It prevents from accidental turn off. Great feature. Board is designed to fit in to breadboard, while circuit itself can be a nice piece for your next MCU project.