The latest firmware supports 1-Wire, I2C, SPI, JTAG, asynchronous serial, MIDI, and PC keyboards ... on the edge of the PCB. USB interface The Bus Pirate is powered from the USB 5volt supply ...

[Joonas] became frustrated with cheap but crappy MIDI to USB converters, and the better commercial ones were beyond his budget. He used a Teensy LC to build one for himself and it did the job ...