Once upon a time i stumbled on the intriguing 2D HID sensor (human interface device) of the Nintendo Wii controller. I turned it into a input device functioning as a alternative for the mouse.

It is a IR camera with a nice resolution (128x96 pixel) recognizing the position up to 4 IR-emitters.
This camera sensor dose not take pictures, but it provides positions of all 4 possible IR-sources.

In the beginning i tried to convert 2 old Wii controllers into a stand alone sensor. I found somewhere some schematics, but i did not get any (SPI) signals.

After searching for alternatives i found the same sensor as a stand alone product.

If the sensor see's one IR emitter, this so called BLOP, gives the position of the mouse cursor. If a second BLOP appears, a left mouse click is triggert. The third BLOP triggers a right mouse click.

For a ego-shooter game i added a auto fire (fast click rate on left mouse button) and it was quite playable.