- KiCad (for schematic and PCB)
- Fusion 360 (for 3D printed case)
- Arduino IDE (for Teensy code)
- JLCPCB (for PCB fabrication)
- Monoprice MP Mini (3D printer used for case)
- The built in LED on one of the Teensy pins draws enough current for the built in pull-up resistor to be overwhelmed. An extra pull-up resistor in parallel with that pin is needed.
- The center knob's pushbutton isn't wired up. I ran out of pins. The final pushbutton pin has been broken out so a bodge wire can connect it to one of the teensy's extra IO pads. I haven't bothered.
- The code is probably a bit jank, but it works well enough for me that I haven't changed it further.