QMK Proton C

QMK Proton C


An improved QMK powered keyboard controller and so much more.

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The QMK Proton C is the Controller You Didn’t Know You Needed

At the heart of every keyboard is a controller. It is a computer chip that is responsible for translating your button presses into signals your computer can understand. Many PCB’s have a controller built in (or “Pre-soldered”) while others rely on an external controller. The most popular external controller is a Pro-Micro.

Jack Humbert and I have been working an improved controller. We call it Proton C and it is a drop-in replacement for a Pro-Micro, with some extra features:

  • USB-C Port that won’t break off easily

  • 32-bit Cortex-M4 Processor

  • PWM on every exposed pin

  • A break-away section with extra pins and a place to mount a speaker

  • RESET button with a sane bootloader

Add Audio To Your Build

Proton C comes with a speaker mount you can use to add Audio to any build. Just solder in a Mallory Sonalert AST1109MLTRQ and you can have auditory feedback. Whether you play a sound for layer changes, use Music Mode to turn your keyboard into a piano, enable Audio Click, or just use it as a cute little soundboard, having the ability to play sounds will give you new ways to extend and customize your keyboard.

Upgrade Your Existing Pro-Micro Based Kit

You can solder a Proton C into any QMK-compatible kit that currently uses a Pro-Micro, and compile Proton C firmware without any extra work! We’ve done the heavy lifting of making your existing keyboards work without any keymap changes. Just adjust your make target and it will build an ARM firmware instead of an AVR firmware. Configurator support is coming in Q1 2019.

Take Your Handwired Build To The Next Level

Now you can have USB-C and Audio in your hand-wired builds! Proton C provides you with 23 GPIO pins to use- Enough to wire a full sized keyboard! If you’ve been thinking about building a custom keyboard the time has never been more right.

Proton C Technical Specifications

  • Processor: ARM-7 Cortex-M4 STM32F303CCT6

    • Core Size: 32-Bit

    • Speed: 72MHz

    • Connectivity: CANbus, I²C, IrDA, LINbus, SPI, UART/USART, USB

    • Peripherals: DMA, I²S, POR, PWM, WDT

    • Number of 3.3v I/O: 23

    • Number of 5v Output: 1

    • Program Memory Size: 256Kb

    • RAM Size: 40K

    • VCC: 3.3v

  • USB-C Connector With Throughhole Fixing Pins

  • 5v Output for WS2812 RGB Strips

  • RAW pin for 5v VCC-supply

  • Speaker Mount for AST1109MLTRQ