Let's Split w/ Qwiic Pro Micros and slave half isn't working

Qwiic System
1

I just put together a Let’s Split by following the verbose guide on GH. I built it with two Qwiic Pro Micros (which have USB-C) and no matter what I try, whichever side is the slave doesn’t work. It’s essentially the same symptoms as this thread. Except my jumpers seem fine. Whichever half is plugged in via USB works, but it always thinks it’s the left half.

Some things I’ve tried:

  • Measuring the voltage on the slave side between the jumpers/bridged area (VCC and GND). Always 4.7v

  • Measuring the voltage on the slave side pin3 and GND (4.7v)

  • Testing continuity between pin 3, VCC, and GND on either half (good continuity; as in pin 3 on left half connects to pin3 on the right half, etc)

Is there some difference between the Qwiic Pro Micro and a regular Pro Micro? This is my first QMK keyboard. Do I need to do something special to tell it to use serial instead of i2c?

2

There are not any functional differences between the Pro Micro and the newer Qwiic Pro Micro, the newer version just changes the USB connector and adds a Qwiic connector.

There are additional I2C pullup resistors included on each Qwiic Pro Micro, if you have I2C pullups included on your device, you might try disabling those to see if that helps.