I found this cheap robot toy at Walgreens one day for $5. I bought it because I can’t resist crap. Especially cheap crap. And i liek robots, so whatever. It is a simple remote control toy, but I soon discovered it had a nice drive train and gear system. Actually a perfect system for using in a mini solar tracker. It turns horizontal motor rotation into vertical rotation. Perfect for mounting a solar panel and sun sensor!
The solar tracker circuit is taken almost directly from the below websites.