Pedalino: A smart, open source wireless MIDI foot controller for guitarists and more « Adafruit Industries – Makers, hackers, artists, designers and engineers!
DIY Arduino Midi Controller for Line6 M5 - YouTube
Arduino (Teensy) USB MIDI foot controller for Katana amps
Code and circuit for a six-function Arduino-based USB footswitch :: Sacha Chua
USB Pedal HID Keyboard With Arduino Leonardo : 9 Steps - Instructables
Arduino UNO Guitar Pedal | Arduino Project Hub
Turn an Arduino Uno into a MIDI Controller: Guitar Pedals - Hackster.io
Finally, An Open Source MIDI Foot Controller | Hackaday
How to Build DIY Arduino USB Expression Pedal for Efektor WF3607 | Kuassa
ElectroSmash - pedalSHIELD UNO Arduino Guitar Pedal.
Simple To Build Programmable Foot Switches | Hackaday