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olihunt #1 27/05/2012 - 20h25

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I built a 3 point setup as described in the sticky. I used two 50 ohm resistors in parallel in place of the resistors, giving 25 ohms of resistance in theory. With the camera, I can see them shining so it is working. I put a piece of negative film infront of the PS3 Eye, and I can't seem to set up freetrack to track the LEDs, rather than the random noise it is picking up. Anyone got any tips?
dewey1 #2 27/05/2012 - 21h49

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What is your supply voltage?
olihunt #3 27/05/2012 - 22h11

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It's 3v, I have two 1.5V AA batteries in a battery pack.
dewey1 #4 27/05/2012 - 22h36

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That setup is less than ideal.
You need to use 3 separate resistors, one for each LED in a parallel circuit.
Each resistor having a value of 27 Ohm would allow about 55 mA of current for each LED and a total of 165 mA current from the 3 Volt supply.

http://forum.free-track.net/index.php?showtopic=1856
Edited by dewey1 on 27/05/2012 at 22h41.
olihunt #5 28/05/2012 - 02h51

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That's exactly what I've done, the LEDs are in parallel, each with their own set of two resistors in parallel. If you consider the set of resistors together, they make a resistor with ~25 ohms. I only did that because I didn't have any lower valued resistors available.
Gian92 #6 28/05/2012 - 11h08

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Next time explain yourself better and be more thorough; that's my tip.
Ordem e progresso” - Brazilian flag
olihunt #7 08/06/2012 - 13h47

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Gian92 @ 28/05/2012 - 11h08 a dit:

Next time explain yourself better and be more thorough; that's my tip.



I thought I explained it pretty clearly.

Does no one have any input on how I might get this to work? The LEDs are definitely working, the camera works, but the photographic film I'm using to block out visible light doesn't seem to be doing the job. Loads of random noise, and the infrared is barely getting through, although this could be due to the camera's infrared filter?
Gian92 #8 08/06/2012 - 19h10

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olihunt @ 08/06/2012 - 13h47 a dit:

I thought I explained it pretty clearly.


olihunt @ 27/05/2012 - 20h25 a dit:

I used two 50 ohm resistors in parallel in place of the resistors [...]


What you said is that you were using two 50-ohm resistors for the whole circuit and you didn't mention the source voltage; that's not a "pretty clear" explanation (I was referring to your first post).

Anyway, did you play with the threshold handle? What's your threshold setting?

If that doesn't work either put more pieces of exposed and developed film layers or use two overlapped transparent acrylic layers, one green and one red, which is a better filtering solution.

Also, in the PS3 Eye settings put the gain value to minimum, exposure to medium or maximum and white balance to auto.

If nothing works take away the hot mirror of the camera and/or get an infrared-passing filter at 850 nm (preferably made of German polished glass) and/or LEDs with greater wavelength, or buy TrackIR  ;D

In any case it's strange, I'm using the PS3 Eye flawlessly without filters whatsoever, although I replaced its objective lenses.

Another advice is to check if the environment isn't too bright for tracking, and, of course, that your LEDs are working properly.

PS3 Eye signal-to-noise ratio is good, so if you can't solve your problems consider having an unlucky or defective camera.
Edited by Gian92 on 08/06/2012 at 19h50.
Ordem e progresso” - Brazilian flag
Gian92 #9 09/06/2012 - 09h43

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I almost forgot, you can also adjust accordingly the min and max point diameter values in "point size" settings.
Ordem e progresso” - Brazilian flag

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