2 layers28.3 × 39.8 mm
LevelShifter
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
21 parts5.1kGPL-3.0
2 layers57 × 78 mm
Hackpad
reimunyancat/hackpadA custom 9-key (3x3 matrix) macropad with a rotary encoder and a 1.3" OLED, built for the Hack Club Stardance Hackpad YSWS.
- Size
- 57 × 78 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 24
- Pads
- 120
- Tracks, vias
- 130, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 7 Jun 2026
- Updated
- 13 Aug 2026
Overview
Hackpad is an open-source printed circuit board by reimunyancat, from the reimunyancat/hackpad repository on GitHub. It is a 2-layer board of 57 × 78 mm with 21 parts on 24 nets, routed with 130 tracks and 0 vias.
Its parts include 10 switches, 9 diodes, 1 IC and 1 connector. It belongs with the RP2040 boards of this library.
README
readme.mdHackpad — 9-Key Macropad
A custom 9-key (3x3 matrix) macropad with a rotary encoder and a 1.3" OLED, built for the Hack Club Stardance Hackpad YSWS.
- MCU: Seeed XIAO RP2040
- Layout: 3x3 switch matrix + 1 rotary encoder (EC11) + 1.3" 128x64 OLED (I2C)
- Firmware: KMK (CircuitPython)
- Case: Sandwich-style, fully 3D printed
Gallery
Assembled model
Schematic
PCB layout
Case (3D)
Bill of Materials
| Component | Qty | Notes |
|---|---|---|
| Seeed XIAO RP2040 | 1 | MCU (kit) |
| 1N4148 diode | 9 | matrix anti-ghosting (kit) |
| MX-style switch | 9 | (kit) |
| Kailh MX hotswap socket | 9 | self-sourced |
| EC11 rotary encoder | 1 | 20mm D-shaft (kit) |
| 1.3" 128x64 SH1106 OLED | 1 | I2C, self-sourced |
| 2.54mm 4-pin female header | 1 | OLED mount, self-sourced |
| DSA keycap | 9 | (kit) |
| M3x16 screw | 6 | (kit) |
| M3x5x4 heatset insert | 6 | (kit) |
| Custom PCB | 1 | JLCPCB, 2-layer, ~57x79mm |
| 3D printed case | 1 | top plate + bottom shell |
Repository structure
.
├── README.md
├── CAD/
│ └── assembled-model.STEP
├── PCB/
│ ├── hackpad.kicad_pro
│ ├── hackpad.kicad_sch
│ └── hackpad.kicad_pcb
├── Firmware/
│ └── main.py
└── production/
├── gerbers.zip
├── Top.STEP
├── Bottom.STEP
└── main.pyFirmware
KMK (CircuitPython). Flash CircuitPython to the XIAO, copy the kmk library folder onto the CIRCUITPY drive, then drop Firmware/main.py on it.
Pin mapping (taken from the schematic):
- Columns: D0, D1, D2
- Rows: D3, D6, D7
- Encoder: A = D8, B = D9, SW = D10
- OLED I2C: SDA = D4, SCL = D5
- Diode orientation: COL2ROW
Specs
- PCB: ~57x79mm, 2-layer (limit 100x100mm)
- Case: fully 3D printed (limit 200x200x100mm)
- Inputs: 9 keys + 1 encoder = 10 (limit 16)
- Tolerances: 0.2mm on mating surfaces, M3x5x4 heatset inserts (4.7mm holes), M3x16 screws (3.4mm clearance)
Note: I need a soldering iron — please include the $18 soldering iron grant.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | D | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9 |
| 9 | SW_Push | keyswitches:Kailh_socket_MX | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW10 |
| 1 | XIAO-RP2040-DIP | Seeed_Studio_XIAO_Series:XIAO-RP2040-DIP | U1 |
Questions
How big is the Hackpad PCB?
It measures 57 × 78 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hackpad use?
21 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 Hackpad KiCad files?
From the reimunyancat/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 reimunyancat before reusing the design.
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