Evil Mad Scientist Laboratories presents us with a cool and simple project. I think this will catch your eyes because its very simple to build and the effect is cool. I know that in my first year of electronics i wanted to build something like this, and had to do allot of search on the internet to find something like this and was much more complicated than this schematic. So beginners can do this project without a problem. How it works ? The circuit is based on a LTR-4206E phototransistor. The black package blocks visible light, so it is only sensitive to infrared light– it sees sunlight and incandescent lights, but not fluorescent or (most) discharge lamps it really will come on at night. And the rest is history, start building it right now and you will see how cool it is. Follow the link for full project info Link.

Light Activated LED