A4988 Stepper Motor Driver - https://www.amazon.com/dp/B01M9EAYFT/ref=cm_sw_em_r_mt_dp_jddNFbDJ4ZQ08?_encoding=UTF8&psc=1

Any bipolar stepper motor will work here. But I recommend and have tested this- https://www.amazon.com/dp/B00PNEQKC0/ref=cm_sw_em_r_mt_dp_lfdNFbM15XZS6

Firmware can be forked here: https://gitlab.com/Quartapound/satnogs-rotator-firmware

Satellite pass/QSO where this rotatot/antenna have been used:

https://grobotronics.com/images/detailed/106/htb1acn_eoqil1jjszfhq6ydzfxaa_grobo.jpg

This is just an ordinary CNC shield controller for arduino https://www.amazon.com/dp/B01M9EAYFT/ref=cm_sw_em_r_mt_dp_jddNFbDJ4ZQ08?_encoding=UTF8&psc=1