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With the interface in place, the mount can be used to find objects (GOTO) and automatically follow them with high accuracy (autoguiding). Since many astronomy software tools support ASCOM, this allows the mount to be controlled by existing software. A simple Arduino sketch provides the USB interface, and a custom driver allows the ASCOM Platform to control the mount. With the hardware in place, cranked out some software which is available on Google Code.

but lets the Arduino take control of the mount. This keeps the Arduino and PC fully isolated from the motor circuits. To connect to an Arduino, a TLP521-4 quad optoisolator is used. This port can be added to just about any motorized mount with some modification to the controller. There’s one pin per direction that the mount can move, and a common pin. ’s Arduino ST4 interface lets you connect your PC to a reasonably priced motorized telescope mount, without ripping it apart.

There’s many complex systems for automatically pointing a telescope at an object in the sky, but most of them are too expensive for the amateur astronomer.

Stellarium control telescope