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...
  • 16mm
    30% built with 16mm switch spacing Same schematic as the Gherkin , running the same firmware. 16mm is about as close as you can get the ...
  • 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 ...
  • 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...
  • 1 iota
    40% keyboard the size of a 30% 16mm switch spacing instead of standard 19.05mm PCB mount switch with diode installed inside the switch ...
  • Semaphore
    5x6 Split Keyboard Made a split split keyboard. Each half is made of two identical PCBs. Each PCB is under 100mm, very cheap to have made....
  • 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 ...
  • mf68 revised PCB
    Second version of mf68 TMK PCB Fixed switch spacing issues from first PCB Holes for mounting post centered better Reset switch centered...
  • 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...

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