Does anyone know if a hobbyist can pull the time from TV signals like you can with an RPi/GPS-hat/etc? I'd love to have a bedside clock that pulls from TV signal for no other reason than I didn't even know that existed until now.
If you're in a country that still broadcasts Teletext[0] then it's available over analog or DVB-T. VCRs used to do this to set their clock automatically in Europe.
Also, if you already have a time, you can keep it using the 50/60 Hz of the electric grid (which is specifically regulated to keep cheap alarm clocks in sync) or the TV refresh rate (which was also kept in sync deliberately for clocks in the analog days, dunno about now)
