196407400_572207380465924_8181237636270896746_n.mp4
Toggles a relay with a double clap (expandable to triple or quadruple claps)
Designed to be run on an ATtiny85, but can run on any Arduino microcontroller. Input device is a sound-detector like this: https://tinyurl.com/y7kha9k8 (which may need to be tuned with a screwdriver upon purchase).
These videos were helpful for reference: https://youtu.be/b1fT-eOpi9o https://www.youtube.com/watch?v=-WofIjpFR9Y
As well as this page for working with the ATTiny: https://www.hackster.io/arjun/programming-attiny85-with-arduino-uno-afb829