QMK Proton C
|This article requires additional photographic illustration|
|Host port||USB Type C|
|Clock speed||72 MHz|
|I/O Voltage||3.3V, one +5V output pin|
|Program memory||256 KB|
The QMK Proton C is a microcontroller-board, pin-compatible with 3.3V Arduino Pro Micro. Instead of an 8-bit AVR, it uses the ARM Cortex-M4 based STM32F303CCT6 as microcontroller. It was made especially to be used with the QMK firmware.
The USB port is a USB type C, which is both through-hole and SMD mounted. It should be tougher and not as easily torn off as the USB micro B port on the original Pro Micro.
The main part has pads for USB, a +5V output pin for WS2812 LED strips and a physical reset button.
The bottom is a break-away part with 11 additional digital I/O pins not on the Pro Micro and a hole and pad for a piezo speaker/buzzer.
- Internal pins: D+, D-, CR, A3 (5V)
- Pads on bottom: C14, C15, A3 (3.3V), BT0, C13 LED, RST, SWD, SWC
- Pads on top (breakaway part): Buzzer +, Buzzer -