2 layers208.7 × 393.8 mm
Ferris
pierrechevalier83/ferris
A low profile split keyboard designed to satisfy one single use case elegantly
102 parts1.3k
2 layers285.9 × 94.3 mm
"Maximalist" ergo mech split keyboard. 38-keys, 3 rotary encoders, 1 trackpad.
- Size
- 285.9 × 94.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 102
- Nets
- 92
- Pads
- 465
- Tracks, vias
- 1,090, 69
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Sep 2025
- Updated
- 4 Oct 2025
Overview
Zen is an open-source printed circuit board by bkienzle3, from the bkienzle3/zen_kb repository on GitHub, published under the MIT licence. It is a 2-layer board of 285.9 × 94.3 mm with 102 parts on 92 nets, routed with 1,090 tracks and 69 vias.
Its parts include 38 diodes, 38 switches and 2 ICs. It belongs with the keyboards and input boards of this library.
README
README.mdzen_kb
"Maximalist" ergo mech split keyboard. 38-keys, 3 rotary encoders, 1 trackpad. My last keyboard was mu (無), meaning nothing. Since this adds a lot of extra bells and whistles, I've named it zen (全), meaning all. This keyboard is meant to be much more "finished" than mu. With that said, this is still an eternal work in progress. The hardware is finished, at least. The config is a never ending journey.
Firmware
Firmware is located in qmk_firmware. Keymaps are based on Miryoku (manna-harbour/miryoku), with my own customizations, of course.
Bill of materials
Kailh Choc V1 key switches x 38
KB2040 x 2 (MCU - runs on 3.3v, important for trackpad)
1N4148 MiniMELF diode x 38
TRRS-PJ-320A x 2 (TRRS jacks)
Alps EC12E2440301 x 2 (Mini encoders)
Alps EC12E24404A8 x 1 (Jog wheel encoder)
Cirque TM040040-2024-303 x 1 (trackpad)
Molex 505110-1297 x 1
.50 mm pitch type B FFC x 1
M2*6mm screws, hex socket head x 12
M2 heat set inserts x 12
Other
I recommend putting some sort of grip tape around the knobs. I'm using self-fusing silicone tape, but anything should work.
Parts
102| Qty | Value | Footprint | References |
|---|---|---|---|
| 38 | D | Diode_SMD:D_MiniMELF | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +22 |
| 38 | SW_Push | keyswitches:SW_PG1350 | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +22 |
| 11 | , , , , , , , , , , | ||
| 3 | RotaryEncoder | EC12:EC12E2440301 | ENC1, ENC2, JOG1 |
| 2 | Cirque Curved Trackpad | Trackpad:Cirque Curved 40mm Trackpad | REF1, REF1 |
| 2 | TRRS | Keebio-Parts:TRRS-PJ-320A | TRX1, TRX2 |
| 2 | kb2040 | kb2040-kicad:kb2040 | U1, U2 |
| 1 | Trackpad | 505110:5051101297 | TKP1 |
The 97 most common of 102 parts.
Questions
How big is the Zen PCB?
It measures 285.9 × 94.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Zen use?
102 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 Zen KiCad files?
From the bkienzle3/zen_kb repository on GitHub, at the commit this page was made from: the board is zen/zen.kicad_pcb and its schematic zen/zen.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Zen design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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