Hand-wired Ergodox with Pro Micro

The parent model used a Teensy and an I/O expander, which is very similar to the original Ergodox PCB.

I hand-wired my keyboard using two Pro Micro controllers (one in each half) and an I2C connection between them. This is similar to the way the Let's Split keyboard is wired. I used mirrored copies of the same case for both halves so I can attach a USB cable to either side.

Modifications from parent:
- Enlarged the controller slot to fit the Pro Micro snugly.
- Enlarged the TRRS area to better fit my longer/narrower sockets.
- Filled in the reset hole from the Teensy. There's no reset button on the Pro Micro, and I use a software reset keystroke.
- Added thickness to the middle of the cable cavity to prevent some sagging that was visible from the top.

The OpenSCAD files depend on the STL files from the parent.