Yeah, I knew they were knockoffs, but at least they would work on a PC. I've read that they're somewhat poorly built though, so I'm hesitant to shell out the $90 or so that they would cost. Plus, they're so damn ugly
As far as building a controller goes....I've been checking around on the web for info, but it's not really clear to me what you would need to make this happen. Most of the sights on motion detection that I've come across are focused on building an entire circuit, depending on what you want it to do. I don't really think that would be necessary, since I have the iPac, but I'm no electrical guru either.
The big questions, I suppose, are these:
Would you need to amplify/restrict the signal from the sensor in order for the iPac to understand it? I don't know how much current is enough current and I definitely don't want to fry the iPac.
Can the sensor "sustain" a signal if you hold your hand under it? Many of the songs require you to hold a note, but I'm not sure that a simple sensor could handle that unless you built a more complex circuit for it.
More and more it seems that this is a bigger job than I care to undertake right now. I might just wait it out and see if someone manages to get a PS2 controller working in Stepmania. Still, ideas and suggestions are welcome!