4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers91.7 × 44.1 mm
Qpad
AdrianR3/qpadThe QPAD is a small 6-button macropad designed for use with QLab. It uses KMK firmware, and it has 12 NeoPixel LEDs for feedback and information display.
- Size
- 91.7 × 44.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 26
- Pads
- 106
- Tracks, vias
- 138, 5
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 9 Jul 2025
- Updated
- 10 Jul 2025
Overview
Qpad is an open-source printed circuit board by AdrianR3, from the AdrianR3/qpad repository on GitHub. It is a 2-layer board of 91.7 × 44.1 mm with 19 parts on 26 nets, routed with 138 tracks and 5 vias.
It is built around the SK6812MINI-E. Its parts include 12 diodes, 6 switches and 1 IC. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdThe QPAD
The QPAD is a small 6-button macropad designed for use with QLab. It uses KMK firmware, and it has 12 NeoPixel LEDs for feedback and information display.
<img src=assets/potential_layout.png alt="Suggested Keycap Layout" width="300"/>
Assembly:
The case for the pcb is split into two parts. The two parts are fastened with 4 pairs of heated inserts and appropriate bolts (see BOM).
<img src=assets/lid_off.png alt="Case with PCB Installed and Lid Off" width="500"/> <img src=assets/assembled.png alt="Case with PCB Installed and Lid On" width="500"/>
PCB
Schematic
<img src=assets/schematic.png alt="Schematic" width="700"/>
PCB
<img src=assets/pcb.png alt="PCB" width="800"/> <img src=assets/rendered_pcb.png alt="Rendered PCB" width="500"/>
BOM:
The materials needed to make the QPAD are as follows:
- 1x XIAO RP2040
- 6x Cherry MX Switches
- 6x DSA Keycaps
- 4x M3x5x4 Heatset Inserts
- 4x M3x16mm Socket Head Cap Screws
- 12x SK6812 MINI-E LEDs
- 1x 3D Printed TOP (file)
- 1x 3D Printed BASE (file)
- 1x QPAD PCB (gerbers.zip)
Firmware
The firmware1 for the QPAD is currently based off of KMK.
Footnotes
-
To flash the firmware onto the board, copy circuitpython onto the XIAO. In addition to copying over the firmware, make sure to install KMK too! ↩
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | SK6812MINI | LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 6 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6 |
| 1 | XIAO-RP2040-DIP | OPL:XIAO-RP2040-DIP | U1 |
Questions
How big is the Qpad PCB?
It measures 91.7 × 44.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Qpad use?
19 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 Qpad KiCad files?
From the AdrianR3/qpad repository on GitHub, at the commit this page was made from: the board is pcb/QPad.kicad_pcb and its schematic pcb/QPad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Qpad design in my own project?
Its repository states no licence, so its author keeps all rights: ask AdrianR3 before reusing the design.
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