Lukas Fässler from Soldernerd published a project writeup showing how he built a PIC-based beacon keyer:
This is likely the first ham radio related project that I document here on this blog
But my very first PIC project was a beacon keyer that I made for my father, HB9BBD. That was in 2013. A beacon keyer is a great project to get started with microcontrollers since it’s not much more than a fancy way of blinking an LED.
Project info at Soldernerd homepage and the GitHub repository here.
What the keyer do? Sends random morse code or there is some input? If someone can point me to some source to read I would be helpfull. :)