This is a low-profile macro pad utilizing capacitive touch instead of traditional mechanical switches. It’s designed to be compact, silent, and easy to assemble. I designed the icons specifically for common Discord Shortcuts: Mic Mute, Audio Mute, and Screen Share. But you can import a svg and edit them to your hearts desire.

Features

• Zero Moving Parts: Uses TTP223 touch sensors for a modern feel.
• Compact Footprint: Powered by the tiny but powerful Waveshare RP2040-Zero.
• USB-C Connectivity: Easy to plug into any modern setup.

Hardware Needed

• 1x 3D Printed Case (this file)
• 1x Waveshare RP2040-Zero (No headers)
• 3x TTP223 Capacitive Touch Modules (No headers)
• Thin gauge wire (22AWG/ 0,6mm recommended)
• Hot glue (for securing components)

Wiring Diagram

Assembly Notes & Software

1. Soldering: Solder everything together beforehand, as it is very difficult to solder everything while the components sit in the case.
2. Mounting: Use a dab of hot glue to secure the sensors directly behind the icons. Ensure the sensor side is flush against the plastic for best sensitivity.
3. Firmware: My pad runs on KMK (CircuitPython).
   1. Follow the “Getting started” Guide on the KMK wiki.
   2. Upload the provided code.py (linked below as code.txt) to the root directory of your board.
4. All done!

Software

My code.py i used with the KMK Firmware is linked below (as code.txt).

The software just emulates the F13-F15 function buttons, that i saved as a Hotkey for the designated task in Discord.

Print Settings

• Material: PLA or PETG (White works best if you want to see LED status through the shell).
• Infill: 15-20%.
• Supports: Not required if printed with the faceplate down.
• Layer Height: 0.16mm