RP2040 Pro Micro 16MB/128Mbit USB-C Controller

• Compatible with Pro Micro-based PCBs
• Mid-Mount USB-C port for low-profile
• RP2040 microcontroller
• Flash Memory: 128Mbit/16MB (W25Q128JVPIQ)
• Up to 27 I/O pins available
• USB D+/D- accessible via pads
• On-board boot and run/reset buttons
• 1.6mm thick PCB
• Comes with two 12-pin headers and one 5-pin header
• Firmware Support: QMK, KMK, CircuitPython

This controller can be used the same way as the Elite-Pi, so you can follow the guide for the Elite-Pi, which can be found here: Elite-Pi Usage Guide. When compiling, just replace "elite-pi" with "helios". Please read the guide for some important notes. 

Question: Can I use this on just one half of a split keyboard and use a Pro Micro on the other half?

Answer: No, you can not mix the controller with a Pro Micro or Elite-C. However, another RP2040 controller can be used with it.