This summer (2023) I built a smaller horn and automated its elevation control with a stepper motor.  My idea was to build a prototype of a roof(?)-mounted scope that could do drift scans on the meridian (and also have the ability to aim itself down for hot calibrations)  The system runs on WiFi, with both data collection software and an Arduino sketch (to control the stepper) running on the Raspberry Pi.  The Pi is mounted on the back of the telescope's waveguide.   EM noise is not a big problem!  I get a few distinct noise peaks, but these are easily dealt with in data handling software (see figure on the left.)  Since the horn aperture is smaller than my other telescope (only 36 cm x 29 cm) the overall statistics are not as robust as those obtained with the larger scope.