Here are some things I made.
The Plastic Pitch Plus is made for experimenting with microtonal scales/tunings. It provides an intuitive interface for retuning a MIDI keyboard.
Michelangelo is a synthesizer module that makes it possible to play a synthesizer with a Wii Nunchuk controller.
The boomCHUCK is the winning entry from the 2018 Moog Circuit Bending Challenge. The challenge was to modify electronic devices to construct a unique musical instrument with a $70 budget. To that end I augmented a Yamaha DD7 drum machine with a custom analog audio signal processing circuit and interfaced a pair of Nintendo Wii Nunchuk controllers to play it. I built it in my “spare time” (while working full time and being a father to my two small children) over the course of six weeks. I presented it at Moogfest, the annual art and technology festival, where the final judging happened.
The MIDI to CV/Gate Converter (left) and Nunchuk Controller to Control Voltage Adapter (right) were the first devices I sold. (I am no longer selling them to focus on bigger projects.) I chose the former as a simple, first project to do bare-metal programming of an ARM microcontroller. I very soon after found myself designing the latter as part of building the boomCHUCK (above), and a slightly modified version is part of the Michelangelo Nunchuk Controller Eurorack Module.
The GameSquare is a custom handheld video gaming system built around a Raspberry Pi. The LCD display is repurposed from a monitor intended for use with a rear view parking camera. The controls are thru a Nintendo Wii Classic Controller PCB interfaced to the Raspberry Pi via I2C. I wrote a custom linux I2C driver in C and a curses UI in Python that allow full control (without attaching a keyboard). I designed the case and had it laser cut from a sheet of bamboo.
My first Arduino microtonal MIDI device was the reason I got into Arduino in the first place, to experiment with microtonality.