News How to Build a Raspberry Pi Hand Washing Timer

What a waste of time, money and effort. Just run down to WallyWorld and buy a sand time or cheap digital timer.

Seems a decent project from a learning perspective.

Could also turn it into a t-rex evasion tool. Plays scary music if you aren't staying still 😀
 
What an overkill. its like taking a sledgehammer to crack a nut. This is not Pi territory, hell its not even arduino territory. maybe an arduino with attiny. frankly you can do it even without a microcontroller.