This project is a an adapter that attaches a morse code key to a computer
as a MIDI device. The device sends MIDI codes for the key (or two codes
for paddles) and a button to be used as a push-to-talk for a microphone.
The code in the dongle is based on the Lightweight USB Framework for AVRs (LUFA) MIDI demo, with a host program that generates tones to pass to the DTTSP SDR and control transmit through usbsoftrock.
click image for a larger version