Author Topic: 120 wide angleLED  (Read 6609 times)

Offline Beachbum

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on: March 20, 2008, 02:08:53 PM
this is my first post. just trying to get my mind around everything that's possible with the wiimote. i've been looking around for leds and came across this site http://www.ledtronics.com/ds/SML10IR941T/ which some of you may already know about. they have 120 ir leds, and they run at 50mA. however, they are $3.38 each just wanted to make sure i've contributed to the site since i am super inexperienced electronic-wise and will probably be bugging a few of you for answers to really stupid questions. i hope this is helpful.



Offline balam

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Reply #1 on: April 09, 2008, 09:12:30 PM

this ones actual work
and they are so cheap.

http://www.mouser.com/Search/Refine.aspx?Ntt=*tsal6200*&N=1323038&Ntx=mode%2bmatchall&Ns=P_SField&OriginalKeyword=tsal6200&Ntk=Mouser_Wildcards



Offline inio

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Reply #2 on: April 09, 2008, 11:58:41 PM
Beachbum: Why do you want wide-angle?  If you're trying to image the LED itself, and from a reasonable distance, I recommend these:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=LN52-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=LN152-ND

they're 950nm instead of 850, so you lose a little efficiency, but I can see the 152 from up to about 6' away with high sensitivity.  the 50 (slightly narrower angle) should be visible from further.  You can run them at 100mA in free air, or even a little higher if you can figure out a way to heat sink the body.



Offline Beachbum

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Reply #3 on: April 14, 2008, 09:26:40 AM
inio, sorry for the delay in the reply. i was hoping the wide angle would allow the wii mote to better detect the led when the led was pressed against a board with the wiimote placed behind you. i unfortunately have gotten really busy with school and work and havent had a lot of time to even finish building my first pen. i do appreciate the links though. i will definitely have to look into those leds. thanks again



Offline inio

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Reply #4 on: April 14, 2008, 04:46:36 PM
Oh, for that 120ish is probably pretty good.  Wider wouldn't hurt, but likely wouldn't help much either.  You're better off just holding the pen a little bit away from the board at an angle.



Offline Smokeduv

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Reply #5 on: April 15, 2008, 03:36:07 PM

Hi! I'm new here (well, i have been looking this page for like 2 weeks, hehehe) and I looked this post, about these 120 LED, but, ehm, they are too expensive, and, why don't you try to make yourself a wide-angle LED by just modifying the way the light is emmited? It's really too simple, I have tried it myself, I just made my own IR pen (i will post some photos in a few days) and you can modify the angle by using hot silicon bars, I made a hot silicon bubble surrounding the LED, that way, the IR light will "light" the silicon, thus, making a bigger spot and, as you are making a bubble, it can be viewed at almost any angle. If you don't believe me how it works, put a laser or a normal white or color LED and put it near a silicon bar, you will see that it will look like a lightsaber, hehehe.



Offline benpaddlejones

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Reply #6 on: May 10, 2008, 08:51:31 PM
Could you provide pictures ???

What do you mean by "bubble" does there need to be an air gap between LED & silicon or do you just mean a round drop of silicon surrounding LED ???

Does the quality of silicon or clear/semi-opaque have an effect ???

Could be promising for those that can't get the wider VA IR-LED's

benpaddlejones


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