Elite-Pi - USB-C Pro Micro Replacement RP2040 Controller – Keebio

Elite-C V4 - USB-C Pro Micro Replacement ATmega32u4 – Keebio

Elite-Pi Microcontroller - Ergoboards

Postage Board Mini - USB-C Controller Board for Handwiring – Keebio

USB-C Pro Micro issues

Elite-Pi - USB-C Pro Micro Replacement RP2040 Controller – Keebio

USB-C Breakout Board – Keebio

Did anyone tried to put black pill stm32 into lily58 ? : r

Alternatives · joric/nrfmicro Wiki · GitHub

Spice up your DIY keyboard builds with this little microcontroller, which works with the TMK and QMK firmware. It's got 18 pins for you to work with.,

Pro Micro (Micro-USB) - 5V/16MHz - Arduino-compatible ATmega32U4

Elite-Pi

Keyboard Builders' Digest

Stampy - RP2040 USB-C Controller Board for Handwiring – Keebio