Author Topic: bigger range with IR Pen.  (Read 6221 times)

Offline sebbel

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on: June 09, 2008, 07:19:55 AM
Is there a possibility to have an IR Pen which has a bigger range as the regular ones?

I'd love to just point with my pen on the whiteboard from 5-6 meters away.
Do you guys think thats possible?

For my Project to work, I would need to have a range of 5 meters and possibly more. But the problem is, that I dont know how to realize that!



Offline thex

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Reply #1 on: June 09, 2008, 07:52:13 AM
i already repliad to this question in another thread...

yes you can use an ir laser. you can find these in optical laser mouses.

thex

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Offline benpaddlejones

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Reply #2 on: June 09, 2008, 08:35:47 AM
Sebbel
Sounds good, but would need a visable laser pointer as well, so you know what you are pointing at or will just be waving in the dark!

Have you tried jasonlpsmith's app http://www.wiimoteproject.com/project-ideas/wiimote-presenter-powerpoint-mouse-control-timing-application-release-t881.0.html. It does what you want but instead of waving the IR source from 5m away you wave the Wiimote from 5m. When I'm using this I have an IR-LED inbuilt to a battery pack that sits on my Whitebaord Pen Ledge. I find works awesome except I have shacky hands so no good for writing. I doubt even if I had still hands it would be 100%, you are tring to replicate a fine motor skill on a gross motor skill level (never going to happen to same quality).

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Offline DerTürke86

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Reply #3 on: June 10, 2008, 04:24:57 AM
Guys you are everybody talking about a IR laser but nobody is talking about the danger this kind of laser have! It is not a good idea to use an IR laser because 1. u dont see the laser and if you look inside maybe its too late! These kind IR laser like you can find on ebay are very dangerous you can lose your eye light

Please are very careful with use of this!
And first of all everybody should know the dangers about this!!!!



Offline benpaddlejones

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Reply #4 on: June 10, 2008, 04:44:57 AM
DerTürke86
Another reason jasonlpsmith's app is a better option me tinks!

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Offline takai

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Reply #5 on: June 10, 2008, 08:44:42 AM
The IR "laser" in an optical mouse isnt really a "laser" its more of an IR led.

You could use an IR laser out of a CD drive or similar, but they are much more dangerous than simple red lasers as your pupil wont contract when its hit by it, so youll experience the full brunt of the IR laser on your cornea (same reason why doing eye tracking by reflected IR light from the coroid is so visually exhausting).

The only really safe way to do it is to use a significantly high powered IR LED (20,000mcd equivalent) and then use a couple of tiny tiny tiny Fresnel lenses to refocus the light from a wide spray to a small beam. And even then it might not work particularly well.