Author Topic: Well, made my IR Pen...can't figure out why it isn't being accurate  (Read 4386 times)

Offline Balineseterror

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I used the radio shack recommended LED for this pen. I used an expo dry erase marker and unfortunately only could find a double A battery casing so I had to mount it on the outside. Truthfully the entire pen doesn't look professional at all. However it does work.

Now here is the issue:

The entire LED is mounted on the outside of the pen cap, so there is no blocking of the light at all, it can go out at the 180 degree angle that the LED is capable of doing.

Whenever I use it with the whiteboard software the pen is completely inaccurate. I have done a test with it both as a tablet and as a whiteboard and in both instances I never had an accurate cursor from the pen.

Any help would be appreciated, need to have this working before this Thursday.










Offline benpaddlejones

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Balineseterror

Read my post: http://www.wiimoteproject.com/ir-pens/electronics-101-sharing-my-mistakes!-***-updated-***/ You will find the Radioshack IR-Led doesn't cut it, the Vishay TSAL6400 (www.farnell.com) will work.

I suggest you watch my youtube video: [youtube]-4ZuiwLGE8I[/youtube] this is a better way to install the battery and make it easily rechargable.

Goodluck :)

Benpaddlejones




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Offline Balineseterror

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I had done it with the radio shack one because other people said it had worked fine...unfortunately my projector was broken and just arrived fixed by dell so could finally test this out. I highly doubt I have time before the school year starts to get an order from that company to get that type of LED IR.

So, are there any suggestions for me to figure out to make this work better OR 'buy' a solution that I can have in my hands before this weekend?

New to public school, in a new school, using the computer mainly due to the fact that the autistic children respond better this way.

When I taught private school I used a tablet with my projector, and that was easy, but I cant do that in this new school so I am in a bind.

So, anyone, any thoughts? I am more than willing to pay for a solution that will save me before thursday/friday the latest but I need to figure out one.

Thanks



Offline benpaddlejones

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Balineseterror
Maybe see if any local eletronic suppliers who stock Vishay TSAL 6400 or TSAL 5300 (both work well) from memory http://www.vishay.com has a list of stockist.

As you will find when you read my other post on eletronics & the datasheet for Radioshack IR-Led, it isn't strong enough or wide enough viewing angle. The radioshack maybe strong enough from a highly reflective surface (very shinny whiteboard, uncommon in classes due to glare) or only your laptop screen, but not in a normal classroom interactive whiteboard setting.

I also suggest changing your switch to a tactile or SPDT switch which will a give cleaner on/off.

Goodluck :)

Benpaddlejones


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