Simple Hackpad

A custom 4-key macro pad designed for productivity and built with the Seeed Studio XIAO RP2040. This project uses KMK Firmware (CircuitPython) to handle custom keymaps and RGB lighting effects.

PCB Layout

This layout features optimized trace widths for power delivery to the LEDs.

Schematic

The circuit design utilizes a direct-pin connection, avoiding the complexity of a diode matrix for a small 4-key setup.

3D CAD View - Style 1

3D CAD View - Style 2

3D CAD View - Full Assembly

This view was critical for ensuring the USB-C port on the XIAO would be easily accessible through a case cutout.

3D PCB VIEW:

This is a 3D render generated within KiCad to preview the final manufactured board.

3D full hackpad

It helped me visualize the spacing between the mechanical switches and the board edge. This is the master assembly model combining the PCB, switches, and the switch plate.

Firmware & Features

The firmware is built using KMK. It includes:

• Custom Macros: Configured for KiCad shortcuts and media controls.
• RGB Screensaver:A rainbow animation that activates during idle time.
• CircuitPython: Easy to edit on the fly by just saving the code.py file.

Repository Structure

• firmware: The code.py and configuration files for KMK.
• hardware: KiCad schematic and the .step 3D model.
• README-IMAGES: Visuals used in this documentation.

Specifications BOM:

• 4x Cherry MX Switches
• 2x SK6812 MINI Leds
• 1x XIAO RP2040
• 4x Blank DSA Keycaps
• 4x M3x16 Bolt
• 4x M3 Heatset