DIY programmable 32 CC midi controller brain

UPDATE: 19/12/2025
-added GUI pour easy programming

This is a 32 potentiometer/fader midi CC brain module.

It feature one arduino pro micro Leonardo and 2 74HC4067 multiplexers.
It allow to simply plug 1 to 32 pots or fader to the PCB to send MIDI CC to a computer.
Arduino.ino sketch included.

All 32 inputs can be easily programmed via a html GUI to activate the INPUTS and change de CC value.
The values are stored into the Arduino eeprom so they stay even if the arduino is unplugged.

IMPORTANT:
This GUI is programmed in html and will open inside your browser (windows/Linux/MacOS using Chrome/Chromium only, other browser not tested and might not work).

Gerber file is include for an easy PCB making by JLCPCB.

It can be the brain of any DIY midi controller project up to 32 CC, or for testing purpose.
It work well from only 1 and up to 32 pot/fader, just activate the desire INPUT with the GUI.

Note that an INPUT must be activated in the GUI only if a physical potentiometer or fader