Author Topic: New Light Pen Concept  (Read 6006 times)

Offline WiiZizzzzy

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on: November 24, 2008, 11:52:54 AM

Quick intro, thank to those hosting the site and everybody working on this project.  I am a tech in a school board and am currently working towards introducing this system on a wider scale to help supplement the high costs of the product that's currently being pushed.  I have received huge interest from teachers who have not yet been the recipient of the commercial (50x more expensive) product.

During my prototyping I was trying to figure out a way to help reduce the "viewing angle" issue with the camera and being able to clearly see the IR source.

Instead of the LED coming straight out of the end of the pen it is set at a 90 degree angle so that when your holding it like a pen, it keeps the LED pointing directly at the camera for the strongest signal.

it takes some practice to get the hang of as it is easy to rotate your wrist to undo the effect, however I have found it to be much more reliable for dragging and dropping which my traditional pen lacked quite a bit.

Similar concept to diffusing the IR light I suspect.



Has anybody tried something similar? what were your results?



Offline benpaddlejones

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Reply #1 on: November 24, 2008, 06:54:58 PM
WiiZizzzzy
Yes you can bend the IR-Led at 90 degrees, place the the IR-led at the end of the pen instead of the tip and other similar methods. All require the user to change how they would intuitively use a pen 'Human Interface Device'.

Rather you can just use a Vishay TSAL6400 IR-Led and have no problems with it being at the tip of the pen.

benpaddlejones :)


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Offline WiiZizzzzy

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Reply #2 on: November 24, 2008, 07:51:02 PM

I've read most of the threads for the pens and LED's used but haven't got my hands on any of the Vishay's yet.  They really are that drastic of a difference eh?  I found everything except dragging or writing to be very reliable with the ones I found at a local electronics shop while getting my setup together last week.  I'll have to get myself some of the Vishay's on my pen before I worry to much about pen design. 

Myself personally prefer holding my HID like a pointer rather than a pen.  I have never been able to write on a blackboard or whiteboard to save my life anyways ;)  I supposed I shall create a pen and pointer variation once I get the correct LED's

Thanks for the reply Ben!



Offline benpaddlejones

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Reply #3 on: November 24, 2008, 09:31:03 PM
WiiZizzzzy
Yes the Vishay will make a MASSIVE difference. read this to understand why: http://www.wiimoteproject.com/ir-pens/electronics-101-sharing-my-mistakes!-***-updated-***/

This is a list of where you can buy Vishay TSAL6400 http://www.wiimoteproject.com/for-sale/vishay-ir-led's/

benpaddlejones :)


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Offline wiipenmaker

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Reply #4 on: January 11, 2009, 11:26:27 PM
I like the type of pen you are using in the picture with the LED at a 90 degree angle. What type of pen was it before you modified it.  Thanks. I am trying to build my own like that one.