A solar tracker can increase the efficiency of a solar panel by up to 100%! It does this by always keeping the panel perpendicular to the incoming rays of sunlight.
here's an equation to prove this:
P = AW sin θ
P = power generated by the solar panel
A = Area of the solar panel
W = is the solar constant, which is equal to 1340 watts per square meter
θ = the angle of the incoming light
Since sin(90) = 1 you get the best performance out of the panel when it is totally perpendicular.
1 - Arduino Uno w/ ability to program it
1 - Breadboard
1 - 2 axis tracking mechanism (i used a magnifying mirror that swiveled up and down)
2 - 360 deg continuous rotation servos
1 - ball bearing tilt switch or similar
5 - 10k resistors
1 - 5V breadboard power supply
3 - cadmium sulfide light sensitive resistors
Step 1: The Y-axis
I picked up a magnifying mirror from Shoppers normally used for shaving or applying makeup. It had a base and a swivel to tilt the mirror up and down.
I cut off one side of the swivel bracket and replaced it with a servo. I measured so that the shaft of the servo would line up with the swivel point of the mirror. I then had to drill a hole for the servo shaft to fit into.
I used hot glue and zip ties to secure the servo to the base and then the servo shaft inside the hole I had drilled.
Step 2: The X-axis
Once the glue was dry, I attached the servo and screwed in the setscrew.