Meet the Rock Band: electromechanical instruments that make music with rocks by throwing them through the air and vibrating them. The rock band consists of a Pinger, Spinner, Slapper, and Buzzer. Here is how they work:
- Pinger – fires small rocks at aluminium keys using solenoids.
- Spinner – launches magnetic rocks, Hematite, at pieces of marble. Rocks are launched by spinning magnets using Applied Motion applied-motion.com stepper motors.
- Slapper – slaps rocks with fake leather.
- Buzzer – vibrates the plunger of a solenoid against a piece of marble.
The whole machine is controlled by a computer running a MIDI player written in openFramworks and a Teensy.
More info is available here.