2 layers44.5 × 46.9 mm
OSO SWAT B1-jig
joeycastillo/Sensor-Watch
A board replacement for the classic Casio F-91W wristwatch
31 parts2.1k
2 layers105.2 × 67.2 mm
12KEMP
OakTreeWC/12KEMPA 12 key 4by3 macro pad w/ a custom PCB and rotary encoder than uses an Arduino Pro Micro with vial-qmk firmware.
- Size
- 105.2 × 67.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 24
- Pads
- 121
- Tracks, vias
- 179, 0
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 21 Mar 2024
- Updated
- 14 Jul 2025
Overview
12KEMP is an open-source printed circuit board by OakTreeWC, from the OakTreeWC/12KEMP repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 105.2 × 67.2 mm with 31 parts on 24 nets, routed with 179 tracks and 0 vias.
It belongs with the keyboards and input boards of this library.
README
README.md12KEMP
12KEMP is a 12 key 4 by 3 macropad, that features an Arduino Pro Micro with vial-qmk support, a rotary encoder, and a custom pcb with support for 3/5-pin switches. All PCB files are in this repo, and you may create any form of case to mount the pcb onto. Additionally, a bill of materials (BOM) is included. This project does require soldering.
P.S. My keys look a little bit wonky since I used some 3-pin switches I had laying around. 5-pin switches are preferred since they are already aligned.
Gerber Download
Bill of Materials
- Qty. 1 Arduino Pro Micro
- Qty. 1 Rotary Encoder
- Qty. 1 Headers --- (Only required if Pro Micro doesn't come with some.)
- Qty. 12 MX Switches --- Any 3/5-pin MX switch you would like. 5-pins are recommeded.
- Qty. 1 PCB --- For mine, I used JLCPCB. It cost around 10 dollars for the pcb and shipping. Took about two weeks to finish manufacturing and arrival. You may use any other service you would like for a pcb (Gerbers are linked above).
- Qty. 12 Keycaps --- Any Cherry MX style keycap will do.
- Qty. 1 Encoder Knob --- This can be 3D printed or bought online. Make sure its for a 6mm "D" shape encoder.
Firmware
To install firmware on the Arduino Pro Micro, you can use QMK Toolbox.
- Download and install QMK Toolbox
- Download the firmware
- Plug in your Pro Micro into your computer
- Open QMK Toolbox and load
- After the keyboard reboots, it should be configurable in Vial
Credits
Kudos to:
Jeroen94704's "klepcbgen"
Contributors of the "vial-qmk" repo
xwing's Rotary Encoder Knob
Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | Diode_THT:D_A-405_P7.62mm_Horizontal | , , , , , , , , , , , , | |
| 12 | Blank | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | K0, K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3_DIN965 | H1, H2, H3, H4 |
The 29 most common of 31 parts.
Questions
How big is the 12KEMP PCB?
It measures 105.2 × 67.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 12KEMP use?
31 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 12KEMP KiCad files?
From the OakTreeWC/12KEMP repository on GitHub, at the commit this page was made from: the board is KiCad_Files/12KEMP.kicad_pcb and its schematic KiCad_Files/12KEMP.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 12KEMP design in my own project?
Its repository publishes it under the Apache-2.0 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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