Made a little morse serial transmitter with my new #arduino 
It decodes button presses in real time and transmits the character with UART. The 'words per minute' is currently hardcoded, so on-offs need to be somewhat fast (for me anyways).
The code is here, written in AVR C. Reviews welcome!
https://codeberg.org/some/arduino-uno-projects/src/branch/main/morse_transmitter/morse_transmitter.c