Theremin
I'm working on a bunch of hardware stuff. I'm up to my 3rd prototype of a device that combines GPS with TERCOM style algorithms using a bunch of sensors for use in areas that have terrible GPS coverage (initial use was canyoning). Hopefully, when I receive the samples, I'll have ironed out most of the hardware faults! I've also just (sort of) finished a TinyGo version of firmware that runs on a cheap Adafruit board in combination with Gaudi Lab's OpenThereminV3 shield to provide MIDI theremin capabilities for live music performance. That one is available at https://github.com/intermernet/theremin if anyone wants to play with it.