4 layers234 × 84 mm
Main panel
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
234 parts3kApache-2.0
2 layers100 × 66.7 mm
RenPad
rupnil-codes/RenPadThe firmware supports: - Key matrix scanning - OLED key feedback display - RGB underglow effects - Windows productivity shortcuts
- Size
- 100 × 66.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 27
- Pads
- 94
- Tracks, vias
- 180, 8
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 18 Feb 2026
- Updated
- 18 Feb 2026
Overview
RenPad is an open-source printed circuit board by rupnil-codes, from the rupnil-codes/RenPad repository on GitHub. It is a 2-layer board of 100 × 66.7 mm with 23 parts on 27 nets, routed with 180 tracks and 8 vias.
It is built around the SK6812MINI-E. Its parts include 13 diodes, 8 switches, 1 IC and 1 connector. It belongs with the lEDs and displays boards and the RP2040 boards of this library.
Main components
1README
README.mdRenPad
RenPad is a compact 8-key productivity macropad powered by the Seeed XIAO RP2040.
It’s designed as a dedicated Windows control deck with an OLED status display and RGB underglow for everyday workflow speed.
Features
- 8 Cherry MX mechanical keys
- 128×32 OLED display (status + key feedback)
- 5× SK6812MINI-E RGB LEDs
- Seeed XIAO RP2040 microcontroller
- KMK firmware (CircuitPython-based)
- Fully custom PCB
- 3D-printed case
Project Images
Schematic
PCB
Case Design
Bottom Case
Top Case
Final Build
System Overview
MCU
Seeed Studio XIAO RP2040 (Through-hole)
Inputs
8× Cherry MX mechanical switches
Outputs
128×32 OLED display (I²C)
5× SK6812MINI-E RGB LEDs
Pin Mapping
| Function | GPIO |
|---|---|
| ROW0 | GPIO6 |
| ROW1 | GPIO7 |
| COL0 | GPIO26 |
| COL1 | GPIO27 |
| COL2 | GPIO28 |
| COL3 | GPIO29 |
| RGB Data | GPIO3 |
| OLED SDA | GPIO0 |
| OLED SCL | GPIO1 |
Key Layout (Windows Control Deck)
| Key | Shortcut | Function |
|---|---|---|
| K1 | Win + V | Clipboard history |
| K2 | Alt + Tab | Switch apps |
| K3 | Win + Tab | Task view |
| K4 | Win + E | File Explorer |
| K5 | Ctrl + Shift + Esc | Task Manager |
| K6 | Win + Ctrl + D | New virtual desktop |
| K7 | Win + Ctrl + ← | Desktop left |
| K8 | Win + Ctrl + → | Desktop right |
Bill of Materials (BOM)
| Part | Quantity | Manufacturer | Part Number |
|---|---|---|---|
| Seeed XIAO RP2040 (TH) | 1 | Seeed Studio | 102010428 |
| Cherry MX Mechanical Switch | 8 | Cherry | MX Series |
| 1N4148 Diodes (TH) | 8 | Vishay | 1N4148 |
| SK6812MINI-E LEDs | 5 | WorldSemi | SK6812MINI-E |
| 128×32 OLED Display | 1 | Generic | SSD1306 |
| DSA Keycaps | 8 | Generic | DSA Blank |
| M3 Screws | 4 | Generic | M3 |
| Heatset Inserts | 4 | Generic | M3 |
Firmware
RenPad runs on KMK (CircuitPython) firmware.
The firmware supports:
- Key matrix scanning
- OLED key feedback display
- RGB underglow effects
- Windows productivity shortcuts
Firmware is located in the Firmware/ folder.
Case
The enclosure is fully 3D-printed and designed in Fusion 360.
It consists of:
- Bottom shell
- Top plate
- Heatset insert mounts
Exported as STEP files in the CAD/ folder.
Author
Designed and built by Rupnil.Codes Hack Club Hackpad Project
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8 |
| 8 | SW_Push | Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 |
| 5 | SK6812MINI-E | footprints:SK6812MINI-E_fixed | D9, D10, D11, D12, D13 |
| 1 | Conn_01x04_Pin | KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty-master:SSD1306-0.91-OLED-4pin-128x32 | J1 |
| 1 | XIAO-RP2040-DIP | footprints:XIAO-Generic-Hybrid-14P-2.54-21X17.8MM | U1 |
Questions
How big is the RenPad PCB?
It measures 100 × 66.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RenPad use?
23 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 RenPad KiCad files?
From the rupnil-codes/RenPad repository on GitHub, at the commit this page was made from: the board is PCB/RenPad.kicad_pcb and its schematic PCB/RenPad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RenPad design in my own project?
Its repository states no licence, so its author keeps all rights: ask rupnil-codes before reusing the design.
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