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Author Topic: Surface Mounted LEDs  (Read 7845 times)

Offline dice

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on: September 14, 2009, 04:51:45 PM
Has anyone tried using Surface Mount LEDs for IR Pens, they are much smaller and some can do 60 degrees or better.  I am wondering if you clustered them together say 4 of them in a pyramid would it work?  and how well.

Just thought about it over the weekend.

Dice


Offline dsgclan

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Reply #1 on: September 22, 2009, 04:48:39 AM
hi Dice, I've experimented with SMD LED with 3 of them in serial, they worked much better, 3 times brighter than 1, but the problem is 2 batteries do not provide enough voltage or power for 3 LEDs, so I had to use a DC power supply to power them.
I'm thinking to have my colleague design a voltage conversion circuit to raise the voltage of 2 batteries from 3V to 4.5V or 5V.


Offline dice

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Reply #2 on: September 23, 2009, 08:42:17 AM
If the voltage is the problem could you not just use a 12v battery like the ones they use for Car Alarm remotes?

Wikipedia - Info

Video of how to hack

At Target $3.99 for 2

I would figure that using this would be best and get a larger resister to bring the voltage down rather than make something to bring the voltage up.

Dice


Offline shakespeare1212

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Reply #3 on: November 11, 2009, 11:15:25 AM
What exact model numbers / company did you get your Surface mount LEDs from?  Are they at the right wave length (940 nm)?

I don't think that you can raise voltage in a DC circuit but you can always throw in more batteries. I am using AG13 button cells in my sword model, 3 of them give me 4.5 volts, and could drive 5 small LEDs if I needed them to.

Cheers.

James.

James Mclain
Owner and Creator of
Whalebone IR and Software

http://whaleboneir.com

or view and buy our products on ebay:

http://ebay.com   Search for IR pen or products by shakespeare1212.

Offline dice

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Reply #4 on: November 11, 2009, 01:16:23 PM
yep you can get the 940nm  I have found them from a couple different sources.  Some have 60-120degree view which would be nice.

Dice


Offline dsgclan

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Reply #5 on: November 16, 2009, 10:25:27 AM
sorry for replying late, the model of LED's I used are also from Vishay, they are tiny LEDs, sorry I forgot the model number, I got them as a few samples by asking Vishay's office in China, I'm sure you can also find it out from Vishay's office in your country?

You are right, using more batteries or higher voltage batteries are much easier, I was just thinking 3 or more batteries would be too heavy for a pen, but it's better than a complicated circuit.


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