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 a toggle switch. J.R. Stoner has been playing around with an interesting circuit called Powach.
This is a standalone toggle power switch with a built-in debounce and power LED indicator. The circuit is built using Schmit triggers and P-channel MOSFET. The 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 accidental turn off. Great feature. Board is designed to fit into a breadboard, while the circuit itself can be a nice piece for your next MCU project.