The software for my arduino controlled 630 meter CW transmitter. This program uses an Si5351 break out board as a VFO to drive a power amplifier and produce a Morse code transmitter for the amateur radio band from 472kHz to 479kHz.
The full blog write-up is available at the following link. http://kb9rlw.blogspot.com/2018/06/a-simple-arduino-controlled-630-meter.html