A very easy project.
You will need:
o) An arduino UNO/MICRO/NANO etc, i will use the micro as always
o) A diode, a resistor, and an optocoupler to make sure nothing gets
damaged in case the midi plug is faulty or has a wrong pinout.
o) A midi plug obviosly 🙂
Get the midi library from the arduino page, and build it like in the schematic:
Read the midi library walkthrough on the arduino page, download the sample codes, and read the documentation in the code to see whats going on.