Keyboard Builders' Digest / Projects
Slump52
A diodeless unibody split by Peter J. A. Cock: Slump52 with number pad.
Published December 24, 2025
Peter J. A. Cock (aka peterjc/astrobeano) shared his monoblock Slump52, an ergo keyboard with number pad, using graph theory to achieve the diodeless design while avoiding ghosting with 4KRO.
Up until now, I have had three different keyboard PCBs fabricated to my own design - all diode-free using Graph Theory. The Gamma Omega TC36K, the Gamma Omega Hesse, and the Forager Acid, with 36, 36 and 34 keys respectively. They've been getting smaller. Well now for something bigger, requested by our nine year old: They want a keyboard with more keys, and deserve smaller keys. Here is the Slump52! – Peter.
Features
- 52 keys (arrows and numpad)
- low-pro Choc switches, hot-swappable
- CFX spacing (17x17 mm), CFX keycaps
- Raspberry Pi Pico controller
- designed via Ergogen and KiCad
- case created programmatically via Ergogen, build123d
- firmware: both ZMK and QMK/Vial
The placement of the Raspberry Pi Pico controller bottom left at an angle is to minimize the keyboard width (putting it centrally like in my earlier Gamma Omega TC36K PCB would add need about 2 cm between the halves).
Resources
- https://codeberg.org/peterjc/pico-keyboards/src/branch/main/slump52/
- https://astrobeano.blogspot.com/2025/12/fourth-keyboard-slump52-with-numpad.html
- https://astrobeano.blogspot.com/2025/12/almost-year-of-diy-mechanical-keyboards.html
Published on Wed 24th Dec 2025. Featured in KBD #204.
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