A simple capacitive-touch MIDI controller project for the Seeed XIAO ESP32S3.

• Board: Seeed XIAO ESP32S3
• Capacitive touch inputs: GPIO 5, 6, 7, 8
• Each touch input currently sends a simple note event when activated

Connect your touch pads, foil, or conductive surfaces to these GPIO pins:

• GPIO 5 -> button 1
• GPIO 6 -> button 2
• GPIO 7 -> button 3
• GPIO 8 -> button 4

You can also connect the touch pads through a resistor or other simple capacitive sensor setup. The firmware uses the ESP32 touch sensing API and calibrates a baseline on startup.

This project uses PlatformIO with the Arduino framework.

From the project folder:

pio run --target upload

To see debug output from the board:

pio device monitor

Set the baud rate to 115200.

• The current firmware prints debug information over Serial so you can confirm that touches are being detected.
• The touch thresholds are calibrated automatically at startup.
• If you want, you can later remap the buttons to different MIDI notes, channels, or velocity values.