So, my HT16K33 controller just failed. Doesn't show up on an i2c scan, and thus my LED buttons don't work.

Other issues I've run into:

- Sparkfun ESP32 Thing: Wonderful board, just doesn't have a mature software stack. SPI and i2c are flaky at the moment. I hope to be able to use it soon.

- LED matrix is clunky, and I didn't make the slot it fits into big enough, so it's curved. Also managed to ruin traces, hooray for jumper wire patches.

So now I'm looking at other ideas. I saw some really nice SMD charlieplexed matrices on Adafruit - 16x9, runs via i2c. I'd love to have several of those, make a really nifty display, but I don't like the gaps when boards are next to each other. Guess I'll look into PCB design - something I've never done!