Ever wanted to control, say, the lights in your room, via your PC? The HardwareSecrets gang shows you how to do exactly that by building a power interface attached to your parallel port. Crazy stuff for you aspiring electrical engineers.

"The computer parallel port is the easiest way to control devices outside the PC, like LEDs, lights and even home appliances. In this tutorial we will teach you how to use the computer parallel port to control circuits outside your computer."