Wiimote as light gun

[arpruss]

I got a Wiimote working as an accurate light gun (emulating an absolute mouse) for NES Zapper (and presumably other systems, but I haven't tested them) games on my Raspberry PI. Normally, the Wiimote doesn't target the point on the screen at which you point, since the Wii sensor bar is a single line and that's mathematically insufficient for recognizing exactly where you're pointing. So what I did was mount two infrared LEDs on the top of my TV and two on the bottom, and then wrote a python script that processes the Wiimote's infrared camera data. I also 3D printed some sights, and the final result is a pretty high precision light gun. The main downside is that I have to be some distance from my TV (about 2.5 meters in my case), or else the field of view of the Wiimote camera doesn't take in both the top and the bottom LEDs.

 

I posted the instructions on Instructables.