4 layers99 × 53.3 mm
PSLab
fossasia/pslab-hardware
PSLab Hardware Design and Schematics https://pslab.io
199 parts1.7kApache-2.0
2 layers309.7 × 117.3 mm
Hackboard
M0HID/KeyboardThis is a 75% keyboard fully designed by me, including the PCB, case, and firmware. It is designed to use KMK, a circuitpython-based firmware for keyboards! I included a rotary encoder, as well as a few "action" keys on…
- Size
- 309.7 × 117.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 255
- Nets
- 223
- Pads
- 1,045
- Tracks, vias
- 1,226, 245
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.99 (file 20241129)
- Created
- 30 Jul 2025
- Updated
- 21 Aug 2025
Overview
Hackboard is an open-source printed circuit board by M0HID, from the M0HID/Keyboard repository on GitHub. It is a 2-layer board of 309.7 × 117.3 mm with 255 parts on 223 nets, routed with 1,226 tracks and 245 vias.
It is built around the WS2812B. Its parts include 168 diodes, 83 switches and 3 ICs. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdK75 - A lightweight, 75% mechanical keyboard
This is a 75% keyboard fully designed by me, including the PCB, case, and firmware. It is designed to use KMK, a circuitpython-based firmware for keyboards! I included a rotary encoder, as well as a few "action" keys on the side of the keyboard which can be reprogrammed to anything you want, such as media controls, text controls, or any kind of shortcut you can think of!
The PCB:
I wanted to create a challenge for myself, and so opted to use the simple Xiao RP2040 as the main MCU. This is however, quite limited in terms of I/O and so i had to make use of 2 MCP23017 io expanders! I also opted to use the QFP footprint on both of them which made things slightly easier to route, given the tight space but probably going to be really hard to solder :sob:
The BOM:
| Item | Part # | Amount | Price [$] |
|---|---|---|---|
| 0402 SMD Diodes | C470745 | 82 | 0.60 |
| Akko cream yellow switches | https://www.aliexpress.com/item/1005007665996795.html | 82 | 27.52 |
| Purple Keycap Set | https://www.aliexpress.com/item/1005005622221680.html | 1 | 15.01 |
| Reverse Mount SK6812-Mini-E | C5149201 | 86 | 5.91 |
| Xiao RP2040 | 1597-102010428-ND | 1 | 4.68 |
| MCP23017 | C629439 | 2 | 3.03 |
| Mill-Max 0305 Hotswap Sockets | ED90584-ND | 164 | 31.42 |
| 3D printed case shipping | 1 | 4.42 | |
| PCB | 26.94 | ||
| PCB mounted Stabilisers | https://www.aliexpress.com/item/1005001632672798.html | 1 | 17.39 |
| Rotary Encoder | C470745 | 1 | 2.81 |
| WS2812B Led Sidelighting | 1 | 5.53 | |
| Total | 139.19 |
Parts
255| Qty | Value | Footprint | References |
|---|---|---|---|
| 86 | WS2812B | Keebio-Parts:SK6812-MINI-E | D100, D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113, D114, D115 +70 |
| 82 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +66 |
| 71 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +55 |
| 3 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_1.25u_PCB | SW73, SW74, SW75 |
| 2 | MCP23017_ML | Package_DFN_QFN:QFN-28-1EP_6x6mm_P0.65mm_EP4.25x4.25mm | U2, U4 |
| 2 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_2.25u_PCB | SW57, SW59 |
| 2 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_1.50u_PCB | SW30, SW43 |
| 2 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_1.75u_PCB | SW45, SW70 |
| 1 | LOGO | LOGO | G*** |
| 1 | MCU_Seeed_XIAO_RP2040 | xiao:XIAO-RP2040-DIP | U1 |
| 1 | RotaryEncoder_Switch_MP | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW84 |
| 1 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_6.25u_PCB | SW76 |
| 1 | SW_Push_45deg | KB_SWITCH_MX:SW_Cherry_MX_2.00u_PCB | SW28 |
Questions
How big is the Hackboard PCB?
It measures 309.7 × 117.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hackboard use?
255 parts, built around the WS2812B. 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 Hackboard KiCad files?
From the M0HID/Keyboard repository on GitHub, at the commit this page was made from: the board is pcb/hackboard.kicad_pcb and its schematic pcb/hackboard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hackboard design in my own project?
Its repository states no licence, so its author keeps all rights: ask M0HID before reusing the design.
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