We’ve seen some curious audio interfaces, but this one is particularly fascinating: mrezanvari has created PendulumSynth, which translates the swinging of a pendulum into USB MIDI or CV for use in any synthesizer or DAW!

The pendulum itself consists of a 10-inch plastic ball with an IMU that wirelessly transmits its data to the Teensy 4.0-powered host. A slip ring and 4-pin GX16 connector allow the pendulum to move freely. mrezanvari hopes to create an nRF24L01-based network of pendulum nodes for even more eccentric performance capabilities. Schematics, BOM, and source code can all be found in the project’s GitHub repo.