Antenna tracker using different servo controller

I was wondering if i could use an arduino or a pixhawk 2.4.8 as a servo controller for mission planner based antenna tracker.i dont have a maestro card or an old apm lying around,i even have a raspberry pi if that is possible

Why not use the antenna tracker firmware?

Got the antenna tracker working with an old pixhawk.but the tilt axis is a nightmare it never points.towards.the drone