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...
  • 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...
  • 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...
  • 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 ...
  • 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...
  • Analog matrix keyboard
    Keyboard using voltage dividers and analog inputs This is a custom keyboard PCB that uses 12 analog channels on a Teensy LC . 4 switches a...
  • 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...
  • feegle XS
    SSL A tinier Feegle . This is the same design as the Feegle but using 4.5x4.5mm tactile switches instead of 6x6mm. The only functional diffe...
  • 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 ...

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