WiiLi.org

[Idle]

Sorry, I posted this on the Sensor Bar section, and got no response. Perhaps better results will come from here.


Does anyone have some nice, reliable information on the wavelength of the sensor? What range does it detect normally?

I am trying to build a modified, projected sensor bar.

My issue is that my TV is quite simply too big. If the sensor bar is at the bottom of the TV, my hand needs to be facing 20 degrees down from level. If its at the top, I get no reception at all (I think the wiimote may have some kind of filter to knock out ceiling lights by not picking up if its rotated too high, or perhaps something else?).

Regardless, I wish to make a sensor bar for the center of my screen, by using IR LED Lasers. The only problem is I don't know what wavelengths are acceptable, and IR lasers are a bit expensive (35$ for one).

I found the wiki saying it is 940nm, but cannot find any LED lasers under 100mW at that wavelength. Obviously, 100mW will burn a hole in my screen, so that is a no-no. <5mW should be just fine, as its not visible.

[SwedishFrog]

The short answer is that you shouldn't need to worry about the exact wavelength too much. The wiimote has been known to pick up signals from all sorts of light sources, including candles, christmas trees, sunlight, remote controls, and LEDS from other devices as well. Finding a suitable LED shouldn't be too hard.

As for you pickup issues, the wiimote IR camera has a limited view angle to prevent interferance from other IR sources. To find an ideal placement for your sensor bar, you should check out the wii's calibration screen. It gives you a straight up view of what the IR camera sees, which should help you find the sweet spot.

Cheers

[Idle]

I understand that, but its not an LED I need. It is an LED laser, which only puts out a very narrow wavelength.

I cant put my sensor bar high enough up...

The laser needs to bounce off my screen, and back to the remote. The biggest issue is they are expensive. 35$ per laser. If I get the wrong one, I am out 70+$.

[Vixus]

The wavelength can be anything from 700-1300nm, who knows, but most remote controls use 950-980nm.

Infrared lasers are very powerful, I doubt you'll find one less than 200mW. What you're asking is quite a tall order... however I found this for $69 but I'm not exactly sure if it's just the source or what...

http://www.us-lasers.com/m980nm5m.htm
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[SwedishFrog]

Interesting idea.

I'm sure you're smart enough to realize this already, but you should know that if your TV screen is curved, it will distort the reflected light and thus affect your pointing ability.

[TiagoTiago]

instead of usign a laser, perhaps you could try using some lenses to project the infrared emition from a regular infrared led into a tighter focus, a bit like what they do with most laser tag guns, most lasertag stuff don't really user laser, the laser you can see sometimes is there just for esthetics....
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[Vixus]