Getting a top score at Guitar Hero or Rock Band seems like a widely spread ambition in the geek community (what about learning an actual instrument huh?) and trying to master the game using electrotechnical skills is the usual best way to do just that. Videos of those projects are very popular all around Youtube because well, it is indeed a nice engineering project.
Well, here is another one and what's particular this time is that it's on the iPhone Rock Band app. The idea is that it scans the screen using light sensors and it then uses sticks with conductive foam at the end to tap the notes. It's pretty crazy if you ask me, here is how it works in video:
