2 layers57.3 × 19 mm
2 layers85 × 90 mm
Simplepad
DundreDE/simplepadAnd that's it. I might add something else later. 👀
- Size
- 85 × 90 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 26
- Pads
- 118
- Tracks, vias
- 163, 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 2 Sep 2026
- Updated
- 2 Sep 2026
Overview
Simplepad is an open-source printed circuit board by DundreDE, from the DundreDE/simplepad repository on GitHub. It is a 2-layer board of 85 × 90 mm with 26 parts on 26 nets, routed with 163 tracks and 5 vias.
Its parts include 12 diodes, 12 switches and 2 ICs. It belongs with the RP2040 boards of this library.
README
readme.mdSIMPLEPAD
SIMPLEPAD is a macroboard with 11 keys, 1 rotary and one OLED display the firmware is powered by QMK. Its a dedicated Num/FN-Key Pad.
Features
- OLED display with layer status
- 2-part case
- 11 macro keys
- Rotary encoder for volume control and switching between layers
- QMK-powered firmware
CAD Model
Made in FUSION.
PCB
Schematic
PCB Layout
CAD Model with PCB
Firmware Overview
This HackPad uses QMK Firmware.
| Control | Function |
|---|---|
| SW1 | 1/F1 |
| SW2 | 2/F2 |
| SW3 | 3/F3 |
| SW4 | 4/F4 |
| SW5 | 5/F5 |
| SW6 | 6/F6 |
| SW7 | 7/F7 |
| SW8 | 8/F8 |
| SW9 | 0/F9 |
| SW10 | 9/F10 |
| SW11 | Mute/nothing |
| Encoder SW | Hold to switch to FN Layer |
| Encoder | Volume Up / Down |
And that's it. I might add something else later. 👀
BOM
Everything you need to build this HackPad:
| Quantity | Component |
|---|---|
| 1× | Seeed Studio XIAO RP2040 |
| 11× | DCA keycaps |
| 11× | MX-style mechanical switches |
| 1× | 0.91" 128×32 OLED display |
| 1× | EC11 rotary encoder |
| 4× | M3 screws |
| 4× | M3 heat-set inserts |
| 1× | 2-part printed case |
Software
- QMK Firmware
- Fusion 360 for the CAD model
- KiCad for PCB design
Hardware
- Seeed Studio XIAO RP2040
- 11× mechanical switches
- EC11 rotary encoder
- 0.91" 128×32 SSD1306 OLED
- Custom PCB
- Custom 2-part 3D-printed case
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12 |
| 11 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11 |
| 1 | ER_OLEDM0.91_1x-I2C | KiCad-SSD1306-0.91-OLED-4pin-128x32:SSD1306-0.91-OLED-4pin-128x32 | U2 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW12 |
| 1 | XIAO-RP2040-SMD | Seeed Studio XIAO Series Library:XIAO-RP2040-DIP | U1 |
Questions
How big is the Simplepad PCB?
It measures 85 × 90 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Simplepad use?
26 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 Simplepad KiCad files?
From the DundreDE/simplepad repository on GitHub, at the commit this page was made from: the board is PCB/simplepad.kicad_pcb and its schematic PCB/simplepad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Simplepad design in my own project?
Its repository states no licence, so its author keeps all rights: ask DundreDE before reusing the design.
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