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
    30 key keyboard Efficient 5x6 matrix TMK firmware PWM backlight Pro Micro controller Unused pins broken out to header How to order P...
  • 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 ...
  • Ordering a PCB
    How to order a PCB from EasyEDA.com from a gerber file EasyEDA now redirects you to order from JLCPCB . The process is not much different....
  • Gherkin Assembly
    Gherkin assembly notes Test fitting all the parts together before soldering anything. You may need to trim/grind some parts to make them f...
  • 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 ...
  • Cheap Green Arduino Micro and Pro Micro clones
    Back in stock on Aliexpress I bought these before but they stopped showing up on Aliexpress. Both are now back in stock. The Pro Micro c...
  • 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 ,...
  • 5x5
    5x5 Modular Keyboard Up to three of these 5x5 matrices can be connected together, controlled by a single Arduino Micro clone. This works i...
  • Contra
    Contra 40% ortholinear keyboard kit This is a very inexpensive kit from Cartel.ltd that includes everything except switches and keycaps. ...
  • Kolea
    Purpose built steno keyboard The Outrigger and Kon Tiki were modifications of a Gherkin that added 4 keys to the bottom. The Kolea is ...

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