Making one for school, not being graded, just fun thing to make and want some ideas (ie , mini windmill, coloured light) Or any helpful websites would be great
Making a solar panel power on a device is something that is timely and interesting to many people. There are solar powered bird baths, solar LED lighting, solar cell phone chargers, solar fans, solar calculators, ...etc.
Making a diarama of the basic principals would be intersting too.
There are some kits under toys & hobbies on ebay.
