Arduino Ultrasonic MIDI (Native version)
This uses a HC-SR04 Ultrasonic Sensor to send Control Change messages to music software. The Arduino registers as a native MIDI device.
Some links to software and potential usage here
https://tinyurl.com/y7fslb83
This code is suitable for Arduino Leonardo, Micro or Due for other models try
https://github.com/psiconlab/Arduino_Ultrasonic_MIDI