The included example 'IICSerialMIDIRouter' shows how to use both serial ports and will send any MIDI messages received on UART 1 to UART 2 and vice versa. Each UART port should be connected to a 5V ...

I2C MIDI Transport for the Arduino MIDI Library. Contribute to peternoya/I2CMIDI_SDEMP development by creating an account on GitHub.

Even though there are many MIDI Accordions available Brendan decided to save his hard earned money and create his very own using a little Arduino programming.

The HIDUINO is a set of firmware for the ATmega8u2 used in the new revisions of the Arduino (Uno, and Mega2560 for example).

Thorin Klosowski DIY musical instruments are their own thing entirely, but if you're looking for a place to start, Adafruit has a guide to building your own MIDI controller using an Arduino.