I've started learning electronics recently, following Chris Gammell's
Contextual Electronics
course, which is really good. One of the first exercises there is
called "Getting to Blinky", and it's mostly about getting used to
using the KiCad EDA suite, and getting over the initial barrier to
getting PCBs made.
I worked through the tutorial, but didn't really feel like sending
boards out just for a blinky. I wanted to do something more
entertaining. It seemed like it might be fun to make blinkies that
blinked messages. In Morse code? Yeah, why not?