DentDentArthurDent posted his tutorials on this link
on Instructables where you could see all the steps you need to make to get this project done. On the photo above we can see the final result with the main frame, the control remote taht has a 3D printed case, a display and some buttons, and we can also see the telescope. Inside that control case there is an Arduino MEGA, an LCD display, a GPS module and a lot more. We can see all the connections in the picture below. Also, on the side we have an example photo that was taken using this technique. He was able to take a photo of the Andromeda galaxy and the result is a lot better than using other techniques.
The image is sharper, bright light and amazing shape of the galaxy. Using step motors, the movement is a lot more precise than using analog controls with maybe a DC motor or just gears rotaing.