AFAIK you can't do real-time stuff on a Raspberry Pi Raspberry Pis aren't great when working with analog signals. I don't think they even come with analog->dig

AFAIK you can't do real-time stuff on a Raspberry Pi Raspberry Pis aren't great when working with analog signals. I don't think they even come with analog->digital converters, and PWM can be janky SD cards suck, when it comes to reliability. You can mitigate this by making the filesystem read-only, but your SD card will still crap out more quickly than built-in flash memory would. Supply used to be an issue with the Zero, but I don't know if that's still true.