2 layers28.3 × 39.8 mm
LevelShifter
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
21 parts5.1kGPL-3.0
2 layers67.2 × 84.7 mm
Macropad
Prateek12code/PrateekPadPrateekPad is a compact 9-key macropad powered by the Seeed XIAO RP2040.
- Size
- 67.2 × 84.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 24
- Pads
- 102
- Tracks, vias
- 155, 12
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 2 Mar 2026
- Updated
- 4 Mar 2026
Overview
Macropad is an open-source printed circuit board by Prateek12code, from the Prateek12code/PrateekPad repository on GitHub, published under the MIT licence. It is a 2-layer board of 67.2 × 84.7 mm with 21 parts on 24 nets, routed with 155 tracks and 12 vias.
Its parts include 10 switches, 9 diodes, 1 IC and 1 connector. It belongs with the keyboards and input boards of this library.
README
README.mdPrateekPad – 9-Key OLED Macropad
PrateekPad is my custom 9-key macropad built completely from scratch.
This was my first time designing a PCB, writing firmware for a microcontroller, and building a full 3D printed enclosure around it.
I started this project with zero experience in hardware design. Now it’s a fully working macropad with an OLED display, rotary encoder, custom PCB, and layered firmware system.
Overview
PrateekPad is a compact productivity macropad powered by the Seeed XIAO RP2040.
Features include:
- 9 mechanical keys arranged in a 3×3 matrix
- Rotary encoder with press functionality
- 128×32 I2C OLED display
- KMK firmware
- Layer switching system
- Custom 2-layer PCB
- Fully 3D-printed enclosure
The goal of this project was to learn the complete workflow of designing a hardware product from scratch.
Assembled Model & Case Model
This shows the full assembled design including the case, switches, OLED display, and rotary encoder.
PCB Layout
A custom 2-layer PCB was designed for the macropad using KiCad.
It integrates the switch matrix, OLED connections, rotary encoder, and the Seeed XIAO RP2040.
Schematic
The schematic shows the switch matrix, diode configuration, rotary encoder wiring, and OLED interface.
Firmware
The firmware is written using KMK, which runs on the RP2040 microcontroller.
The macropad supports multiple layers that allow it to be used for:
- Coding shortcuts
- Media control
- Editing shortcuts
- Numpad input
The OLED display provides quick visual feedback about the current layer.
Design Constraints
This project follows the Hackpad design rules:
- Through-hole Seeed XIAO RP2040
- 2-layer PCB
- PCB under 100mm × 100mm
- Case under 200mm × 200mm × 100mm
- Fewer than 16 inputs
- Fully 3D printed enclosure
What I Learned
This project helped me learn many hardware design concepts including:
- Designing and routing a PCB
- Matrix scanning for keyboards
- Firmware development with KMK
- Mechanical design for 3D printing
- Creating production-ready manufacturing files
Built by Prateek.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8, D9 |
| 9 | SW_Push_45deg | ScottoKeebs_MX:MX_PCB_1.00u | SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10 |
| 1 | MOUDLE-SEEEDUINO-XIAO | ScottoKeebs_MCU:Seeed_XIAO_RP2040 | U1 |
| 1 | OLED_128x32 | ScottoKeebs_Components:OLED_128x32 | J1 |
| 1 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW1 |
Questions
How big is the Macropad PCB?
It measures 67.2 × 84.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Macropad 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 Macropad KiCad files?
From the Prateek12code/PrateekPad repository on GitHub, at the commit this page was made from: the board is PCB/macropad.kicad_pcb and its schematic PCB/macropad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Macropad design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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