40% Keyboards

A blog about small mechanical keyboards.

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Firmware

Firmware for Atmega32U4

TMK

  • Github repository 
  • Main support page: https://geekhack.org/index.php?topic=41989.0
  • Teensy LC/3.0/3.2

QMK

  • Github repository
  • Main support page: https://www.reddit.com/r/olkb/

EasyAVR

  • Github repository
  • Main support page: https://deskthority.net/wiki/Easy_AVR_USB_Keyboard_Firmware

Matrix timing graphs

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Popular Posts

  • Gherkin
    A note about the license the Gherkin is released under. 30 key keyboard Efficient 5x6 matrix TMK firmware PWM backlight Pro Micro cont...
  • Ordering a PCB
    A note about the license the Gherkin is released under. How to order a PCB from EasyEDA.com from a gerber file EasyEDA now redirects you t...
  • Sockets
    Lots of sockets Some of the many sockets I use on my keyboards and other projects. Front row left to right: MillMax standard socket ...
  • nori
    Another modular 4x4 experiment A 4x12 matrix using 3 modular 4x4 matrix boards and powered by a Pro Micro. The previous 4x4 boards were ...
  • Gherkin Assembly
    A note about the license the Gherkin is released under. Gherkin assembly notes Test fitting all the parts together before soldering anythin...
  • Contra
    Contra 40% ortholinear keyboard kit This is a very inexpensive kit from Cartel.ltd that includes everything except switches and keycaps. ...
  • Shine of the Rainbow
    Volume Control I made a rotary encoder with 12 RGB LEDs. I programmed it as a volume control. Pressing down on the knob toggles mute. The LE...
  • gherkin express
    What's in your wallet? A tiny credit card sized TMK powered gherkin. The Gherkin Express is running an ATmega32U2 running at 16MHz. Ther...
  • Dyeing PCB
    Dyeing a bare FR4 PCB plates Gherkin PCB top and bottom plates 3M 220 grit wet/dry sandpaper iDye Poly Purple dye Cheap stainless stee...
  • SMT assembly
    Gherkin Express2 with SMT assembly at JLCPCB I wanted to try out the SMT assembly service at JLCPCB. They were having a special with a...

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