I have built this simple solar tracker. The motor is a bit too fast, but it works and tracks the sun.
The motor is a windscreen wiper motor and it's controlled by two relays. It's based around the
infamous two solar panels wire back to back to track the sun. I think this would work much
better with a slightly smaller slowly geared motor, which I'm looking for. It manages to return
itself to the morning sun, which I didn't expect it to do
Here's a video (don't know how to embed it, sorry):
http://www.youtube.com/watch?v=iF3OaKYnXHUHere's the circuit in case anyone wants to have ago.
Diodes are general purpose silicon diodes, D1 must be able to take the motor current.
R1, R3 are 1K.
R2, R4 are 10k
R5 4K7 variable
Q1, Q2 any general purpose transistors.
SW1, SW2 are the limit switches, normally closed contacts.