Chaos Generator - 2010
This device was made as a lab assignment for a course called Music 250a: Physical Interaction Design for Music, taken during the fall of 2010 at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), where I am currently a masters student. I used an Arduino microcontroller and programmed the firmware, which you can view or download here.
The components I used were an Arduino Nano, a TIP120 transistor, two pushbuttons, a 7805 power regulator, two 22 pF capacitors, a red LED, a piezo vibration sensor, an old speaker cone, the top of a plastic bottle, and a 7.5 volt power supply.
Device Documentation Video