When I purchased my USB Host Shield I noted that there was also a smaller version, so grabbed one of those at the same time. There are three key elements to this project and assembly was particularly fiddly – to be honest, I was making much of it up as I went along! FDTI or similar “programmer” board for the Arduino Pro Mini (must be compatible with the 3.3V version).Arduino Pro Mini – Must be the 3.3V (8MHz) version.If you are new to Arduino, see the Getting Started pages. The concepts used in this project were all explained in the Simple USB-MIDI to MIDI.
I am not responsible for any damage to expensive instruments! Warning! I strongly recommend using an old or second hand keyboard for your MIDI experiments.