473 B

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Pro Micro splittest

To trigger keypress, short together pins B3 and B6 (marked on the PCB as 14 and 10).

Wiring

Add switches to both Pro Micros across B3 and B6 pins
Add pull-up resistor to left side between VCC and F6
Add pull-down resistors to right side between GND and F6
Connect the following pins on both sides together: D0, D1, GND, VCC
Add I2C 4.7kOhm resistors between D0 and VCC, and D1 and VCC
Wire Di of RGB strip for each half to D3