Three LED mushrooms controlled by an IR proximity sensor. The TCRT4000 is meant for measuring RPM of motor shafts, or allowing a line following robot to stay on track, so its range is not that large. With this sketch, it senses a finger or hand from about 1.5 inches away. There is a switch statement in the code where the main loop goes into one of three states. I suggest you experiment with it and discover how it works, it's not too complicated. I didn't make the video below, but it provided inspiration for the project.
