Secret Handshake Firmware: USB Text Keyboard as Ableton-style Music Keyboard

This firmware for the Secret Handshake module turns a wireless USB keyboard into an "Ableton-style Music Keybaord".

The USB received for the wireless USB keyboard can be plugged into the Secret Handshake module, and then the row from A to K will become the white keys of a piano, the row Q to U will become the black keys of a piano, Z and X will change the octave up and down, and C and V will change the velocity up and down.

More information about Secret Handshake can be found here: http://little-scale.blogspot.com/2019/01/secret-handshake-diy-usb-midi-host.html

Download this firmware code for Arduino here: https://github.com/little-scale/eurorack/blob/master/USB_MIDI_Host/Secret_Handshake_-_Logitech_Keyboard.ino

The file defs.h is also required: https://github.com/little-scale/eurorack/blob/master/USB_MIDI_Host/defs.h