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...
  • 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 ...
  • ORTHOPI
    Raspberry Pi 400 mechanical keyboard mod I integrated the ORTHOPI mechanical keyboard PCB with the Raspberry Pi 400 keyboard matrix into the...
  • Contra
    Contra 40% ortholinear keyboard kit This is a very inexpensive kit from Cartel.ltd that includes everything except switches and keycaps. ...
  • 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...
  • Gherkin Assembly
    A note about the license the Gherkin is released under. Gherkin assembly notes Test fitting all the parts together before soldering anythin...
  • 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 ...
  • PB-GHERKIN ESP32-S2 KMK
    KMK running on the ESP32-S2 I soldered some pin headers on a PB-Gherkin so that I could connect it to a ESP32-S2 SAOLA-WROVER dev board. The...
  • 4x4x4x4x4
    Modular keypad/keyboard The basic unit is a 4x4 matrix with 16 keys. Up to 4 of these can be connected to each other side by side. 4x4 ,...
  • PB-GHERKIN Raspberry Pi Pico KMK
    KMK running on the RP2040 I used the same modified PB-Gherkin I used for testing the ESP32-S2 to test KMK on the new Raspberry Pi Pico. The...

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