Ultrasonic Theremin

The Ultrasonic Theremin plays back samples, but modulates them depending on the distance from your hand to the ultrasonic sensor, giving an effect similar to a traditional Theremin. This simple project doesn't need many parts to get its sound because it uses a few of the special hardware features of the ATMEGA 328p chip in the Uno to do most of the work. Because of this, you can't use a Leonardo or a Mega (but the Nano does use the same chip as the Uno, so it could replace the Uno). There is some soldering needed to complete this project.