This is a project that I did for my Physical Computing class. It basically uses the PSR sensor when pressed to make an LED light up with a growing glow while the Servo goes to 180º, then when released the light turns off and the Servo returns back to 0º.
First off I used three triple A's. I also used a Duemilanove and powered my PSR with the 3.3v pin. Besides that there are probably mistakes that I am oblivious to. I did get a fully working end result though. The only issue was that I wanted the light to beat increasingly with the Servo's increase in angle. The fastest being when the Servo was at 180º and slowing till it stopped at 0º. This is my first real introduction into this whole world of Arduinos, electronics and physical computing so I'm sorry for any mistakes that I make.