Author Topic: Vishay 6400 for non reflective usage  (Read 6289 times)

Offline JayAr

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on: August 18, 2010, 03:24:40 PM

I want to put some IR LEDs on the Wiimote and have them tracked by two other Wiimotes. So I'm not using any reflection of the IR light, but have the LEDs directly tracked.

Now I read somewhere that the Vishay 6400 is good for Interactive Whiteboards, where the Pen points at a board, and the reflection is tracked by a Wiimote IR Camera. I was also told that the Vishay 6400 does not have a very wide viewing angle, which is actually good for the reflection at the end.

But since I dont need any reflections at all I wonder now if the Vishay 6400 is also good for my setup, or if maybe I should go for a bigger viewing angle with some other LED??

Offline boonjin

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Reply #1 on: August 18, 2010, 08:04:48 PM

You can use other IR LEDs too but make sure they are high-powered ones with wavelength of 940nm.

For my projects that I used for tracking the IR LED directly, I use the Vishay TSAL 6400 with the surface diffused. I use a sandpaper to thoroughly roughen the surface of the LED. It does diffuse the emitted IR quite well in a large angle including the sides. You should get sufficient tracking from the sides for about several meters.

Boon Jin

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Offline shakespeare1212

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Reply #2 on: August 19, 2010, 09:21:52 PM
All of my IR pens are designed to point the Vishay 6400 directly at the Wii Remote, and I have had no tracking problems what so ever, unless I stand in the way. I like putting the Wii Remote right on top of my projector so that my shadow in the projector beam gives me a guide as to when my body might be blocking the view of the Wii Remote. I have never had the need to use sand paper or any other special treatment, but maybe I'll try that just for the education and fun.

There are MANY demo videos of working with direct detection on and Just search for WBSW, or start with this vid:


James Mclain
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or view and buy our products on ebay:   Search for IR pen or products by shakespeare1212.