4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers86 × 64.2 mm
First ever hardware project! Numpad style macropad for NASA x Stardance
- Size
- 86 × 64.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 32
- Pads
- 113
- Tracks, vias
- 433, 35
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Aug 2026
- Updated
- 28 Aug 2026
Overview
Hackpad is an open-source printed circuit board by junpark527-hash, from the junpark527-hash/first-hackpad repository on GitHub. It is a 2-layer board of 86 × 64.2 mm with 27 parts on 32 nets, routed with 433 tracks and 35 vias.
It is built around the SK6812MINI-E. Its parts include 16 diodes, 9 switches, 1 IC and 1 connector. It belongs with the keyboards and input boards of this library.
Main components
1README
README.mdMy first every Hackpad!
A custom numpad style macropad, built for the NASA x Hack Club Stardance Challenge.
About
I faced many difficulties, challenges, and learning curves throughout this whole process, but in the end, I am extremely glad that I took the time to learn all these new skills. I had to redo my entire idea that I had planned from the beginning because of issues I faced with wiring and pins, but it was quite fun tinkering with these new software programs, and I am happy with the results. My build consists of an OLED screen, an encoder, some keys, and a case.
Features:
QMK firmware a 3-part case (3D printed) 128x32 OLED Display EC11 Rotary encoder for volume and brightness 8 keys/switches 8 SK6812MINI-E LEDs 4 M2 heatset inserts and screws
CAD Model
This case has 3 separate parts: one for the bottom of the case, one for the top half, and one for the bottom half of the top. The top half consists of the cutouts for my OLED and encoder, and the other half has the key switch cutout. I am planning on assembling the case together using M2-Heatset inserts and screws on each corner. It also has 4 small raised pillars in the bottom of the case for my pcb to rest on. Additionally, I made a cutout for the USB on the XIAO.
Schematic
This is my Schematic:
PCB
This is my PCB:
Firmware
I have a total of 8 keys on this hackpad with a rotary encoder. Based on the click of one of the keys, I can change the function of the encoder from brightness adjustment to volume adjustment. The other keys will be used for other functions like copy and paste, media controls, and opening a new file explorer tab or task manager.
BOM
This is everything that should be needed to make this hackpad:
- 8x Cherry MX-style Switches
- 8x White Blank DSA Keycaps
- 4x M3x5x4mm Heatset inserts
- 4x M3x16mm Screws
- 8x 1N4148 Diodes
- 8x SK6812MINI-E LEDs
- 1x 0.91" 128x32 OLED Display
- 1x EC11 Rotary Encoder
- 1x XIAO RP2040
- 1x Case (3 printed parts)
- I will also be needing a soldering iron!
See JOURNAL.md for progress notes.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8 |
| 8 | SK6812MINI-E | pretty:SK6812MINI-E_fixed | D9, D10, D11, D12, D13, D14, D15, D16 |
| 8 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 |
| 1 | MOUDLE-SEEEDUINO-XIAO | pretty:XIAO-Generic-Hybrid-14P-2.54-21X17.8MM | U1 |
| 1 | OLED Display | OLED:SSD1306-0.91-OLED-4pin-128x32 | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW1 |
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Questions
How big is the Hackpad PCB?
It measures 86 × 64.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hackpad use?
27 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 Hackpad KiCad files?
From the junpark527-hash/first-hackpad repository on GitHub, at the commit this page was made from: the board is pcb/hackpad.kicad_pcb and its schematic pcb/hackpad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hackpad design in my own project?
Its repository states no licence, so its author keeps all rights: ask junpark527-hash before reusing the design.