Join Date: Dec 2006
Location: Minneapolis, MN
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With such a large screen, the "sensor bar" may not sync your movements to your cursor on the screen. I find that even my 50" plasma seems too large - if I actually point a wiimote toward the corner of the screen, the cursor will be off screen. I think the wii was designed with smaller TVs in mind.
That said, depending on how handy you are, you might be able to rig something else up...
First, the fact that Nintendo calls it a "sensor bar" is entirely inaccurate. It's really nothing more than a pair of infrared LEDs, shining steadily. It's only function is to give the wiimote a point of reference, and the wiimote is the actual sensor.
If you were to dismantle a "sensor bar," and discreetly mount the LEDs at the bottom (or top) of your screen, a little wider apart than they are from the factory, you could probably have a pretty great setup for a projector. I don't know how much wider than stock they should be to make a large screen feel right - some trial and error may be involved, to get it right.
I watched a video on youtube recently where some guys soldered up a pair of infrared LED lamps, and played wii sports in a full-size movie theater. They didn't use any sort of sensor bar extender - the IR LEDs don't actually need to be hooked up to the wii at all (the wii was up in the projection booth).