Aceman307 shared his first Arduino project on Youtube !
My first project using a Arduino UNO to control my solar tracker.
This solar tracker could easily be modified to be a two axis tracker.
The tracker uses time to track the position of the sun during the day.
I have found using time instead of a light sensor is a more reliable and easier way to track the sun.
See more (including how to build the complete tracker from scratch) here!