I am trying to build a telescope control using Arduino UNO, with AdaFruit Motor Shield, and also with a Teensy 3.6 through the OnStep group. The OnStep system is really nice, but it is designed more for equatorial mounts with stepper motors for both axis. I have an old Meade fork mount LX6 that stopped working years ago, and I thought I'd try to bring it to life. So far, I have the motor running in RA with the Arduino UNO. The RA motor is a stepper. And am in the process of learning how to write sketches that will control the RA stepper motor, ie. East and West control, plus, run two DC motors; one for Declination and one forFocus control.
I am running into a wall trying to learn how to program. Most of the information on writing programs is specialized and, IMHO, very poorly written. I am learning more by writing short sketches in bits and pieces, and seeing how they compile and how they work. But, it's too bad there isn't a better way to learn.
If you'd like to contact me personally, my email is azcharlie@juno.com. I'd be glad to share what little I know and try to help you.
Rick
Tucson