[willis936]

Sorry, I meant "Homework" as in the entire album.

By "modulating the clock" I mean modulating the SoC base clock frequency (nominally 100 MHz, but increased to be a valid and unused FM channel, if decreased then the pi locks up) with the audio to make an FM transmitter. Hook up a wire to the clock output GPIO pin and you have an FM antenna. Lay it next to an old FM clock radio and you now have a clock radio that plays whatever you want. Make a cron job and forget it.

https://github.com/pimylifeup/fm_transmitter

[turdnagel]

That is pretty cool. I'm actually working on a Raspberry Pi based clock and now I want to incorporate this somehow. Thanks for sharing.

[willis936]

I’m certain it plays hell on software timekeeping. If you don’t have an RTC then switching to chrony and increasing the poll rate should help prevent potential clock error.