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Mk75 too many macros edition

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This is a modified version of Brianne's MK75 keyboard. Enjoy

Updated at source: Feb 28, 2026

Model information

This is a modified version of the MK75 that adds a 5 way switch, lots of macro buttons and an OLED

The wiring is shown on a picture. If you wish to replace the 5 way stick with either a button or a knob check out the original files here: https://www.printables.com/model/624069-mk75-3d-printed-handwired-mechanical-keyboard

Parts used:

6x6x7 push buttons: https://nl.aliexpress.com/item/1005006143327227.html
10x10x10 DIP five way switch: https://nl.aliexpress.com/item/1005009707783641.html
0.96 inch I2C oled display (the "new" black one): https://nl.aliexpress.com/item/1005007141354041.html
Tensar RP2040 TYPE-C 16MB: https://nl.aliexpress.com/item/1005006055009344.html
1N4148 Diodes
Some normal MX style key switches and keycaps
Cables to wire it up, the keyboard is printed out of PETG

U2F file for the keyboard: https://github.com/backAir/Bair-s-vial-keyboards/releases/tag/release
Source code for Vial-QMK (mk75): https://github.com/backAir/Bair-s-vial-keyboards

To flash the RP2040 just hold the boot button while plugging it in and then drag the u2f file into it from your file explorer. You can modify what the keyboard does using: https://vial.rocks/

I left pictures for the wiring, but I strongly suggest that you know how QMK works so that you can fix issues if you have them.

I currently don't have the time to program the OLED to do anything.