What it is: An Arduino-based light-sensitive switch for turning on a desktop computer. Why its cool: Use a Sonic Screwdriver to turn on your computer! Story: This project started, as I'm sure a lot of them do, as a result of boredom and the thought "Wouldn't it be cool if...". I am a fan of Dr. Who. Enough of a fan, I suppose, to spend money on a plastic replica of the good Doctor's Sonic Screwdriver (http: ...