4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers114.1 × 77 mm
HackPad
hitenpanda/HackPadThis is a custom-made Advanced HackPad, which is coded to be used for your own services. It has a screen to help you monitor activities, it is customisable too. Also, has different menus but that is configured for me. You can make use of this project to create your own customised hackpad that is unique to you.
- Size
- 114.1 × 77 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 45
- Pads
- 157
- Tracks, vias
- 364, 49
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Mar 2026
- Updated
- 31 Mar 2026
Overview
HackPad is an open-source printed circuit board by hitenpanda, from the hitenpanda/HackPad repository on GitHub. It is a 2-layer board of 114.1 × 77 mm with 40 parts on 45 nets, routed with 364 tracks and 49 vias.
It is built around the SK6812MINI-E. Its parts include 25 diodes, 9 switches, 1 IC and 1 connector. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdHackPad v1
A custom parametric mechanical macropad powered by the Seeed Studio XIAO RP2040. Designed, routed in KiCad, and modeled in Fusion 360 for the Hack Club Blueprint initiative.
Images
Overall Look
Schematic
PCB
Case Assembly
The enclosure is a parametric Lower Tray model built perfectly to fit the PCB outline. It uses a 2.0mm offset, 4.0mm standoffs, and 8.0mm walls for a clean "Floating Key" aesthetic.
Bill of Materials (BOM)
| Part | Quantity | Description / Notes |
|---|---|---|
| Seeed Studio XIAO RP2040 | 1 | Main Microcontroller (Through-hole) |
| Mechanical Switches | 8 | Kailh Choc V2 switches |
| Keycaps | 8 | 1U Keycaps to fit each switch |
| Custom PCB | 1 | Custom 2-layer PCB |
| 3D Printed Tray (Bottom) | 1 | 2.0mm thick base with 8.0mm perimeter walls Translucent |
| Diodes | 9 | 1N4148 |
| Mounting Hardware | 4 | M2 2.2mm screws for securing PCB to tray standoffs and Heatset inserts |
| Display | 1 | 0.91" 128x32 OLED Display |
| Encoder | 1 | EC11 Rotary Encoder and 1 x 3D-Printed Knob |
🛠️ Engineering Log & Design Architecture
To give reviewers insight into the design process, here is the technical breakdown of the hardware environment and enclosure architecture.
Development Stack
- EDA (Electronics): KiCad 9.0
- MCAD (Mechanics): Autodesk Fusion 360
Mechanical Architecture: The "Tray" Design
The current enclosure is modeled as a Lower Tray. The design logic is heavily parametric, ensuring that any future changes to the PCB automatically cascade into the 3D printed enclosure.
- The Reference PCB (Global Zero): The PCB was exported from KiCad as a
.stepfile. It serves as the absolute "Global Zero" for all sketch planes. All enclosure components are built on the underside of the board (Negative Z-axis) to ensure pin clearance. - The Chassis Floor: Traced directly from the PCB outer boundary using a 2.0 mm positive offset.
- Fixing the "Swiss Cheese" issue: Initially, the floor generated as a mess of holes because the switch pin cutouts auto-projected from the PCB. Using Timeline Editing, I re-selected only the inner boundary profiles to generate a clean, solid, dust-proof floor.
- The Standoffs (Pillars): Extruded 4.0 mm up and joined to the chassis floor. This provides crucial clearance for bottom-side solder joints and the XIAO MCU.
- The Perimeter Walls: Originally modeled at 16.0 mm. After performing a physical Stack-up Analysis in CAD (Standoff [4mm] + PCB [1.6mm] + Switch Housing), 16.0 mm caused severe interference. It was parametrically reduced to 8.0 mm, which perfectly covers the rough PCB edge while leaving the switch housings exposed.
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 |
| 9 | D_Small | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9 |
| 8 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW9 |
| 1 | XIAO-RP2040-SMD | Seeed Studio XIAO Series Library:XIAO-RP2040-SMD | U1 |
The 36 most common of 40 parts.
Questions
How big is the HackPad PCB?
It measures 114.1 × 77 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HackPad use?
40 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 hitenpanda/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 hitenpanda before reusing the design.
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