2 layers159.3 × 86.8 mm
2 layers256.2 × 125.1 mm
Mono v2
flinguenheld/chew38A crunched 34 key choc-spaced keyboard.
- Size
- 256.2 × 125.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 83
- Nets
- 52
- Pads
- 606
- Tracks, vias
- 353, 5
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Mar 2024
- Updated
- 6 Sep 2025
Overview
Mono v2 is an open-source printed circuit board by flinguenheld, from the flinguenheld/chew repository on GitHub, published under the MIT licence. It is a 2-layer board of 256.2 × 125.1 mm with 83 parts on 52 nets, routed with 353 tracks and 5 vias.
Its parts include 34 diodes, 34 switches and 1 IC. It belongs with the keyboards and input boards and the RP2040 boards of this library.
README
README.md
A crunched 34 key choc-spaced keyboard.
Split
The original.
Requirements
- 2x PCB
- 2x MCU board 0xCB Gemini or RP2040-Zéro
- 2x TRRS jack
- 34x switches Choc V1 only
- 34x keycaps Choc V1
Optional:
- 23x Mill Max sockets
- 34x Kailh hotswap sockets
- 2x Piezo buzzer
- 2x Back PCB + screws and bolts
- 2x Tenting pucks
- 2x Tripods
Test
You can print these templates to test if it fits your hands:
Firmware
Chew is now running with it's custom firmware written in rust ! 🦀
It also runs on QMK, you can see it's folder and my keymap.
How to build
Check the wiki.
Brainwave
Chew is a mix of these two cool keyboards:
Mono
The same, monobloc though !
Requirements
- 1x PCB
- 1x MCU board 0xCB Gemini or RP2040-Zéro
- 34x 1N4148W SMD diodes
- 34x switches Choc V1 only
- 34x keycaps Choc V1
Optional:
- 18x Mill Max sockets
- 34x Kailh hotswap sockets
- 1x Piezo buzzer
- 1x Back PCB + screws and bolts
Test
You can print this template to test if it fits your hands.
Firmware
The rusty firmware also works with this version. 🦀
Or its QMK folder with my keymap.
How to build
Check the wiki.
Parts
83| Qty | Value | Footprint | References |
|---|---|---|---|
| 34 | Diode | chew_is_so:Diode_SOD-123_chew | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +18 |
| 34 | Keyswitch | chew_is_so:Choc_V1_chew | S1, S2, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23 +18 |
| 8 | , , , , , , , | ||
| 5 | LOGO | LOGO | G***, G***, G***, G***, G*** |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_Mallory_AST1109MLTRQ | Buzzer1 |
| 1 | RP2040_Zero | chew_is_so:RP2040_Zero_chew_mono | U1 |
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Questions
How big is the Mono v2 PCB?
It measures 256.2 × 125.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mono v2 use?
83 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 Mono v2 KiCad files?
From the flinguenheld/chew repository on GitHub, at the commit this page was made from: the board is kicad/mono_v2/mono_v2.kicad_pcb and its schematic kicad/chew_v2/chew_v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mono v2 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).