Linking the S-band station thread here as it is all relevant, just a different dish feed.
As to pi/arduino, I’m not 100% sure if this is what was going to run on the universal controller (@azisi?) but the K3NG rotator controller arduino code is quite universal and probably covers all of our needs, including PWM in the other thread. The arduino presents itself as an easycomm or yaesu rotator, works well with hamlib and other applications. I would personally opt for a microcontroller at that level, so we aren’t having to keep up with raspbian releases, possible deprecation, SD card issues, security, etc.