Quote Originally Posted by skittles View Post
On the subject of making one, one could probably design a simple circuit with a PIC and some quad bi lateral switches to enable for the switching of the various signals, a circuit board could then easily be designed with smd components, it could be milled to a shape, and then a case milled from plastic to the same shape and voila, you have a pendant.

How do these things work? Are they just pulling certain input pins to the parallel port high (or low)?

Regards
Can you have it ready by say, next weekend?:p

And, yes, I believe that is how they work.

Regards, Jeff.