The StarTRACKER is a DIY equatorial mounting for night sky photography.

To take long-exposure astrophotos of objects that are too faint to be seen, you will need a polar-aligned equatorial mounting that allows you to track the stars during their exposure to compensate the Earth’s rotation.

The StarTRACKER is a device that will help your camera to take photos to of the objects in the sky that are too faint to be seen. With a StarTRACKER you will be able to take good expositions to up to 5 minutes without noticing the star´s relative movement .

Setting up details here:
http://jjrobots.com/projects-2/startracker/

Well,
What you need is a pair of wood battens, a rod, a swivel to fix the camera/tripod to the StarTracker, a stepper motor and the motor controller.

More (detailed) info:
http://jjrobots.com/projects-2/startracker/