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Solar Tracker made from $5 discount robot

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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!

http://www.amazon.com/Discovery-Kids-Remote-Control-Rover/dp/B002R3GHIC

The solar tracker circuit is taken almost directly from the below websites.

http://solartracker.greenwatts.info/solar_tracker_LM339_schematic.htm

http://solartracker.greenwatts.info/solar_tracker_LM339_pcb.htm

http://solartracker.greenwatts.info/solar_tracker_LM339_parts.htm

http://solartracker.greenwatts.info/mini_tracker.htm