Author Topic: Custom sensor bar as IR Array possible ?  (Read 6561 times)

Offline defray

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on: February 19, 2008, 08:08:57 AM
Hi,
after starting out with a few candles and my WiiMote, I'll be building my own custom sensor bar with 6 or 8 LEDs.
I wondered if those would be enough to reflect the amount of light needed for stuff like the finger tracking to work ?
They're 70mW LEDs with an angle of 50.

Please tell me about your experiences and what equiment you used ...

greets

defray



Offline Ringer

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Reply #1 on: August 09, 2008, 09:12:57 PM
http://en.wikipedia.org/wiki/Wii_Remote#Sensing
The Wii Sensor Bar has 10 LEDs.

Your homebrew LEDs have to shine and reflect, so the operational distance is effectively halved, and some light intensity is lost in the reflection depending on surface and absorption. 6-8 isn't enough unless they're really powerful, or you're really close. I recommend buying a whole bunch and making an array of plenty more, like in the video (which has 100). If you can pull off the minimalist one, let us know, though!



Offline UndCon

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Reply #2 on: August 10, 2008, 01:14:17 PM
I am not quite pleased with my own array - I'll see if I can crank up the juice a bit more :)

//UndCon



Offline Ringer

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Reply #3 on: August 26, 2008, 05:13:57 AM
Update (sort of): two arrays of eight LEDs each can be tracked VERY well if they're directly aimed at the Wiimote (as opposed to reflection). That's what I have, and I feel it's overkill. I think Johnny got the head tracking glasses to work with just one LED on each side of the head at considerable distance, too.

If you're planning on holding the Wiimote and using it the "intended" way, then reflection isn't an issue, and a sensor bar is the way to go, so disregard what I said earlier. I hadn't considered that. In that case you can probably do it with, like, four.