40% Keyboards

A blog about small mechanical keyboards.

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  • 10 for $5 PCBs

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 PCB...
  • 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...
  • PiPi Gherkin
    Gherkin for the Raspberry Pi Pico Gherkin PCB built specifically for the Raspberry Pi Pico. It has the option of soldering switches directly...
  • ORTHOPI
    Raspberry Pi 400 mechanical keyboard mod I integrated the ORTHOPI mechanical keyboard PCB with the Raspberry Pi 400 keyboard matrix into 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
    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...
  • PiPi Mherkin
    The Micro Gherkin The tiniest Pi Pico powered keypad. Both the switches and the Pi Pico are surface mounted, back to back. The 30 switches w...
  • Contra
    Contra 40% ortholinear keyboard kit This is a very inexpensive kit from Cartel.ltd that includes everything except switches and keycaps. ...
  • 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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