Author Topic: Problem tracking fingers with precision  (Read 6353 times)

Offline durnin83

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on: May 24, 2008, 07:14:41 PM
I made a 20 led array and i'm having trouble tracking fingers at a medium distance (less than 0.5m - more than 0.5m just doesn't detect anything) and getting a lot of noise. I cannot get a tracking point to be still and it alternates between true and false constantly. I'm not using a reflective tape but instead I use a material that reflects almost like a mirror.

Could anyone give me an idea of what I'm doing wrong?

Windows XP SP2
Leds: 3V each, 20mA (5 parallel array of 4 leds each)
Power Source: 12V, 500mA

Here's a photo of the device:
« Last Edit: May 24, 2008, 07:24:39 PM by durnin83 »

Offline musicmovement

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Reply #1 on: June 09, 2008, 08:51:49 AM
I'm afraid I am not an expert but I was just wondering from the picture, it looks like the wiimote is much further back than the LED array (at the end of a tube), maybe it should be further up at the hole.

By the way, I am trying to build the same kind of array. What kind of LEDs did you use? The electronics store near my house told me those little lights would cost 1 euro per LED. I thought that was really expensive.

Offline Peter14850

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Reply #2 on: October 29, 2008, 01:31:05 PM
The problem is the mirror like surface that reflects the IR light to directions away from the wiimote most of the time.  Try using a "retroreflective" tape that reflects the light nearly exactly back to where it came from no matter how it is tilted.  You can easily find online sellers by googling "retroreflective tape".