https://open-e-drums.tumblr.com/test movie : https://www.youtube.com/watch?v=cDVI-QIp1Nc
How to Make : https://www.instructables.com/id/Arduino-Minimal-Drum-Kit/Code : https://github.com/RyoKosaka/drums/blob/master/arduino/HELLODRUM/HELLODRUM.ino
