2 layers173 × 122.5 mm
2 layers134.1 × 86.5 mm
Chopping board
HolographicX/pulpA 40 key split ortho keyboard focused on versatility and simplicity.
- Size
- 134.1 × 86.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 49
- Nets
- 71
- Pads
- 513
- Tracks, vias
- 1,130, 88
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 31 Jan 2026
- Updated
- 8 Sep 2026
Overview
Chopping board is an open-source printed circuit board by HolographicX, from the HolographicX/pulp repository on GitHub. It is a 2-layer board of 134.1 × 86.5 mm with 49 parts on 71 nets, routed with 1,130 tracks and 88 vias.
Its parts include 20 diodes and 20 switches. It belongs with the keyboards and input boards of this library.
README
README.mdpulp
A minimal 40 key low-profile split ortholinear keyboard. Designed with simplicity and versatility in mind.
Split keyboards are a revelation in terms of ergonomics. I wanted to build a split ortholinear keyboard that looks clean and is designed with intention. I took aspects from the Corne and Totem to acheive this minimal yet complete keyboard.
Features
- Hotswappable
- Low Profile
- 128x32 OLED on each side
- Low profile knobs on each side
- 40 keys
- Flippable PCB oO
- Corne style thumb cluster
- Choc v1 switches
- ZMK Firmware
- Replicable, 3D printable and fully open source
Images
PCB
Onshape
Credits
- Erogogen - https://github.com/ergogen/ergogen
- Ceolide's Ergogen Footprints - https://github.com/ceoloide/ergogen-footprints
Parts
49| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | ceoloide:diode_tht_sod123 | D1, D2, D3, D4, D5, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20 +4 | |
| 20 | ceoloide:switch_choc_v1_v2 | S1, S2, S3, S4, S5, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20 +4 | |
| 4 | ceoloide:mounting_hole_plated | H1, H2, H3, H4 | |
| 1 | ceoloide:reset_switch_tht_top | RST1 | |
| 1 | ceoloide:mcu_nice_nano | MCU1 | |
| 1 | ceoloide:display_ssd1306 | DISP1 | |
| 1 | ceoloide:power_switch_smd_side | PWR1 | |
| 1 | ceoloide:rotary_encoder_ec11_ec12 | RE1 |
Questions
How big is the Chopping board PCB?
It measures 134.1 × 86.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Chopping board use?
49 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Chopping board KiCad files?
From the HolographicX/pulp repository on GitHub, at the commit this page was made from: the board is pcb/chopping-board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Chopping board design in my own project?
Its repository states no licence, so its author keeps all rights: ask HolographicX before reusing the design.
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