4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers271.9 × 133.9 mm
Matrix of buttons
ThongNQ867/Key-bored1This is a split keyboard that uses XIAO nRF52840 and MX switches with hotswap, LED and 3-D printed case.
- Size
- 271.9 × 133.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 165
- Nets
- 133
- Pads
- 834
- Tracks, vias
- 1,711, 320
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Mar 2026
- Updated
- 18 Mar 2026
Overview
Matrix of buttons is an open-source printed circuit board by ThongNQ867, from the ThongNQ867/Key-bored repository on GitHub. It is a 2-layer board of 271.9 × 133.9 mm with 165 parts on 133 nets, routed with 1,711 tracks and 320 vias.
It is built around the SK6812MINI-E. Its parts include 92 diodes, 46 switches, 4 resistors, 2 ICs and 2 connectors. It belongs with the keyboards and input and lEDs and displays boards and the nRF52 and nRF5x boards of this library.
Main components
1README
README.mdKey-bored
This is a split keyboard that uses XIAO nRF52840 and MX switches with hotswap, LED and 3-D printed case.
This project is a Split wireless keyboard that run on 2 Xiao nRF52840 on each side. This keyboard runs on ZMM firmware and used MX switches. I made this project because split keyboards are very expensive and I think making one will help people have the similar experience with relatively lower price. Also, the parts like Xiao are reuseable for many projects, making it really cost effective.
How to use:
- After print the PCBA from JLC PCB or order the parts and hand soldered them, solder the hotswap sockets, Xiao, JST pins into the pcb, and finally attach the swithces into the socket.
- Wire the Xiao with your computer and flash each of them with the firmware Basicaly we got a working keyboard now.
- For the case, put the heat inserts in, lay the pcb on top and screw it with M3 (3mm) screws.
The assembled design should look like this
The PCB design:
Schematic (each side):
BOM:
Bill of Materials (BOM)
| Name | Comment | Footprint | JLCPCB Part # | Quantity | Links | Price (Not include shipping) |
|---|---|---|---|---|---|---|
| CR0805F88063G | 806k | R_0805_2012Metric | C101872 | 4 | https://jlcpcb.com/partdetail/LIZElec-CR0805F88063G/C101872 | Within PCB |
| 1N4148W diode | 1N4148W | D_SOD-123 | C81598 | 46 | https://jlcpcb.com/partdetail/ST_Semtech-1N4148W/C81598 | Within PCB |
| TestPoint_Pad_D2.0mm | 4 | Within PCB | ||||
| PCB from JLCPCB | 1 | 35.71 | ||||
| Kalih hotswap sockets | SW_MX_HS_CPG151101S11_1u | Not from JLC PCB | 46 | https://www.aliexpress.us/item/3256809253442692.html | 12.17 | |
| XIAO nRF52840 SMD | modified-XIAO-nRF52840-SMD | Not from JLC PCB | 2 | https://www.aliexpress.us/item/3256806802639384.html | 17.96 | |
| SK6812MINI - E | SK6812 | MX_SK6812MINI-E_REV | Hand solder, not from JLC PCB | 46 | https://www.aliexpress.us/item/3256805061849599.html | 6.16 |
| JST connector | JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | Not from JLC PCB | 2 | https://www.aliexpress.us/item/3256804769340392.html | 1.60 | |
| MX switches | Not from JLC PCB | 46 | https://www.aliexpress.us/item/3256805881801670.html | 8.05 | ||
| Rechargeable LiPo battery | 3.7V 100mAh | Not from JLC PCB | 2 | https://www.aliexpress.us/item/3256805604531299.html | 7.01 | |
| Heat inserts | M3x5x4 | Not from JLC PCB | 10 | https://www.aliexpress.us/p/shoppingcart/index.html | 2.63 |
Parts
165| Qty | Value | Footprint | References |
|---|---|---|---|
| 46 | D_45deg | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +30 |
| 46 | SK6812MINI-E | Hackclub Footprints:MX_SK6812MINI-E_REV | D47, D48, D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59, D60, D61, D62 +30 |
| 46 | SW_Push | PCM_marbastlib-mx:SW_MX_HS_CPG151101S11_1u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +30 |
| 12 | MountingHole | MountingHole:MountingHole_3mm | H1, H2, H3, H4, H5, H6, H7, H8, H9, H10, H11, H12 |
| 3 | MountingHole | Panelization.pretty-master:mouse-bite-5mm-slot | H16, H17, H18 |
| 2 | 2M | Resistor_SMD:R_0805_2012Metric | R3, R4 |
| 2 | 806k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | BAT | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2 |
| 2 | Conn_01x02_Socket | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1, J2 |
| 2 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP3, TP4 |
| 2 | XIAO-nRF52840-SMD | keyboard_lib:modified-XIAO-nRF52840-SMD | U1, U2 |
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Questions
How big is the Matrix of buttons PCB?
It measures 271.9 × 133.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Matrix of buttons use?
165 parts, built around the SK6812MINI-E. 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 Matrix of buttons KiCad files?
From the ThongNQ867/Key-bored repository on GitHub, at the commit this page was made from: the board is PCB/Matrix of buttons.kicad_pcb and its schematic PCB/Matrix of buttons.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Matrix of buttons design in my own project?
Its repository states no licence, so its author keeps all rights: ask ThongNQ867 before reusing the design.