I started the project in February 2019
I had trouble with suppliers from China, and then I had a knee replacement surgery, so it took 6 months to complete. Here are two pictures of the completed rotator:
I completely eliminated the Arduino. I connected a motor hat to the Pi c/w matching stepper motors, and wrote a program for the Pi to emulate an Easycomm rotator. The rotator works fine with GPredict - I haven’t tested yet with the Satnogs Pi program.
The antenna is a 3 element yagi tuned for 137.1 MHz; so far mediocre response due to obstructed passes.