Rpitx: Radio transmission from a Raspberry Pi GPIO pin

This is cool. Reminds me of Michael Ossman's revolting radios [1] defcon talk from a few years back where they managed to spoof a car unlock code with a single GPIO pin IIRC.

[1] https://www.youtube.com/watch?v=tCQaMrRuIqA

Pity they didn't include something like FT8.