YouTuber (and show and tell visitor!) contractorwolf56 (aka James) writes:

This is to demo my prototype controller that I built. Its uses a couple of microcontrollers, the IR Camera from the front of a hacked wiimote and two Xbee radios to create a completely wireless headtracking controller for first person shooter games on the Xbox 360. The hardware used is explained in the first minute or so of the video. If you look at my previous videos you can see the progression of the idea. My LED monitor doesnt have sound but I think you can understand the gameplay without it. In the demo video here i am playing Battlefield 3, but it should really work the same in almost any FPS game. Initial testing was done in COD World at War because it allowed for private matches that I used to calibrate control (without worrying about people shooting at me.