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Thread: Help sourcing IR LEDs

  1. #11
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    Default Re: Help sourcing IR LEDs

    Off the top of my head.. why not the ones used in the DCSSR?

    http://doityourselfchristmas.com/wik...hp?title=DCSSR

    The only difference, is that I removed the OPTO isolator, as it couldn't keep up with the PWM signalling frequencies. So the PIC is poking the MOSFET directly. So rather than PIC-> DCSSR ( ie. OPTO-> MOSFET) -> LEDs... it becomes.. PIC->MOSFET->LEDs.

    If you have a DCSSR PCB handy it should be easy to jumper across the opto and drive the MOSFET direct.

    Edit:
    More details on what I did are in the PDF posted in the DMX2IR thread.



    Quote Originally Posted by Materdaddy View Post
    Recommendation on a .1" spaced MOSFET that would go on perfboard easily and work well for this?
    Last edited by LabRat; 11-18-2013 at 03:40 PM.
    Standard Disclaimers apply:
    "Product may not appear as shown, your mileage may vary, I'm not a doctor nor do I play one on television, these are not the droids you seek"

  2. #12
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    Default Re: Help sourcing IR LEDs

    Quote Originally Posted by LabRat View Post
    Off the top of my head.. why not the ones used in the DCSSR?

    http://doityourselfchristmas.com/wik...hp?title=DCSSR

    The only difference, is that I removed the OPTO isolator, as it couldn't keep up with the PWM signalling frequencies. So the PIC is pocking the MOSFET directly. So rather than PIC-> DCSSR ( ie. OPTO-> MOSFET) -> LEDs... it becomes.. PIC->MOSFET->LEDs.

    If you have a DCSSR PCB handy it should be easy to jumper across the opto and drive the MOSFET direct.

    Edit:
    More details on what I did are in the PDF posted in the DMX2IR thread.
    Thank you very much for that! I bookmarked your thread when you were actively working on it, but didn't really follow everything with the intention of coming back when I had time. I've been busy with life, FPP, komby, and other things that I haven't given much time/thought to the GwtS transmitter this year, but as I'm getting closer, I'm hoping I can get far enough with everything to make it happen.

    Thanks again!
    [url]http://christmasonquiethills.com/[/url]
    [url]http://diychristmas.org/vb1/index.php[/url]

  3. #13
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    Default Re: Help sourcing IR LEDs

    Please keep us (me!) updated on this as well. I've had a number of things impair my forward progress on the GwtS effort and the display in general but I'm trying to make it a priority to get a transmitter out there (driven by Arduino still) when the display kicks off in week so that I can spend the season tweaking code and learning how to sequence for them. At the risk of taking this off topic, my latest idea is to sequence them 1 second ahead of everything else and make use of the time offsets that the ears understand to help increase accuracy/response from the audience. Meaning, if my house is going to turn green at 01:34.00 then I'd send that to the ears at 01:33.00 and then code (that I'd have to write) running on my Arduino transmitter driver would send that command at 01:33.00 with the 1 second offset, send it again a little later with the offset minus the retransmit delay, etc until 01:34.00 when it'd send the "turn green NOW" command.

    Lots of ideas floating around in my head, now I just need some time to implement and play with them. THAT is the hard part though. ;)

    Thanks,

    -joni-


    Quote Originally Posted by Materdaddy View Post
    Thank you very much for that! I bookmarked your thread when you were actively working on it, but didn't really follow everything with the intention of coming back when I had time. I've been busy with life, FPP, komby, and other things that I haven't given much time/thought to the GwtS transmitter this year, but as I'm getting closer, I'm hoping I can get far enough with everything to make it happen.

    Thanks again!
    2015 Plans: More pixels, add more Komby radios, and weld new props!
    [URL="http://amistosolights.com"]http://amistosolights.com[/URL]

  4. #14
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    Default Re: Help sourcing IR LEDs

    http://www.ebay.com/itm/940nm-IR-Inf...item4ac24498be

    I bought my diodes from this guy... very nice via e-mail.

  5. #15
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    Default Re: Help sourcing IR LEDs

    LabRat,

    Just confirming a few things if you don't mind... The daughter boards run the IR LED's in series, correct? Just confirming since the LED floods mentioned below said parallel. These run at 5v regulated and the resistors in series with each set of 3 LED's are 2.2 ohm? Do you know the forward voltage and current ratings of the IR LED's you used? I'm figuring that I'll need to tweak these values slightly since the ones I have probably don't match your spec exactly.

    Thanks!

    -joni-

    Quote Originally Posted by LabRat View Post
    Off the top of my head.. why not the ones used in the DCSSR?

    http://doityourselfchristmas.com/wik...hp?title=DCSSR

    The only difference, is that I removed the OPTO isolator, as it couldn't keep up with the PWM signalling frequencies. So the PIC is poking the MOSFET directly. So rather than PIC-> DCSSR ( ie. OPTO-> MOSFET) -> LEDs... it becomes.. PIC->MOSFET->LEDs.

    If you have a DCSSR PCB handy it should be easy to jumper across the opto and drive the MOSFET direct.

    Edit:
    More details on what I did are in the PDF posted in the DMX2IR thread.
    2015 Plans: More pixels, add more Komby radios, and weld new props!
    [URL="http://amistosolights.com"]http://amistosolights.com[/URL]

  6. #16
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    Default Re: Help sourcing IR LEDs

    5 sets of three in parallel.. (ie. three leds in series with a resistor... x5 (all in parallel)). Check out the schematic in that PDF.

    Don't recall the forward Voltage.. it was a standard part from Vishay.. (as I recall). Can try and dig out the part number tonight.
    Standard Disclaimers apply:
    "Product may not appear as shown, your mileage may vary, I'm not a doctor nor do I play one on television, these are not the droids you seek"

  7. #17
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    Default Re: Help sourcing IR LEDs

    VISHAY TSAL5100 -

    As I recall there was another emitter on the Market (also from Vishay) that had a wider beam angle, but Mouser didn't have them.
    Standard Disclaimers apply:
    "Product may not appear as shown, your mileage may vary, I'm not a doctor nor do I play one on television, these are not the droids you seek"

  8. #18
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    Default Re: Help sourcing IR LEDs

    If = 100mA @ Tp=20ms, Vf typically 1.35V (1.6V max).
    You may pulse them at 1amp at Tp=100us.

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