theremax

A theremin-like instrument for Arduino, using a HC-SR04 ultrasonic ranging module.

Demo

• Demo video

Features

• Play notes of a C major scale based on distance from instrument
• 6 octaves, adjustable by rotary encoder
• Sharp button (modulate up half a step)
• Loop recording mode with metronome light and tempo adjustable by rotary encoder

Requirements

Hardware

• Arduino Uno
• HC-SR04 ultrasonic ranging module
• Speaker/buzzer
• Rotary encoder with built-in push button
• 74HC595 shift register
• 9 LEDs
• 2 push buttons

See the included Fritzing diagram for details (+ wires, resistors, etc.).

Arduino Libraries

• NewPing (for ultrasonic sensor)
• Tone (for speaker)

TODO/Wishlist

• Fix some intermittent tempo issues during loop playback
• Indicator of current recording bar on LEDs (using ShiftPWM)
• Record/playback two tones at once (Tone supports this)

Etc.

• A time-lapse video of us prototyping and building this