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Thread: Lighting pixels w/o data

  1. #1
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    Default Lighting pixels w/o data

    I have some ws2811 12vdc pixels that I'm trying to illuminate for a side project. Is there any way to turn the pixel on by only applying 12vdc to the pixel and no 'data' signal? I don't expect to have any control of being able to change colors since I won't have a data signal.
    lightsofnazareth.com

  2. #2
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    Default Re: Lighting pixels w/o data

    Without a data stream telling each and every pixel what to do, they will not react - even if voltage is applied. Most will just sit there and look at you.

    You can get small controllers that have built in sequences and "on" settings. SPI is the protocol used between pixels.
    "Never Give Up. Never Surrender!"
    Capt Tagert - Galaxy Quest.
    Al Gerdes - Christmas Lighting Nut!

  3. #3
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    Default Re: Lighting pixels w/o data

    Quote Originally Posted by txag2008 View Post
    I have some ws2811 12vdc pixels that I'm trying to illuminate for a side project. Is there any way to turn the pixel on by only applying 12vdc to the pixel and no 'data' signal? I don't expect to have any control of being able to change colors since I won't have a data signal.
    Sorry, but that isn't going to work. Your best bet is to toss a $2 Arduino on them to turn on the lights on power up.
    ~Jason
    [URL]http://www.tooz.us[/URL]

  4. #4
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    Default Re: Lighting pixels w/o data

    Not going to happen without a data signal. WS2811 uses a serial bus and a stream of 24 bit color codes, one for each pixel in the string. Each ws2811 has a decoder chip to pull off the first 24bit color code and passes the rest down the line.

    There are a few small controllers for this out there.
    https://www.aliexpress.com/store/pro...652082488.html

    Kevin

  5. #5
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    Default Re: Lighting pixels w/o data

    Quote Originally Posted by kreeve View Post
    There are a few small controllers for this out there.
    https://www.aliexpress.com/store/pro...652082488.html

    Kevin
    One thing to watch for is a good number of the small controllers have limitations. For instance, this one has a 100 pixel (300 channels) maximum. (The code they send out is only 300 channels long.)
    "Never Give Up. Never Surrender!"
    Capt Tagert - Galaxy Quest.
    Al Gerdes - Christmas Lighting Nut!

  6. #6
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    Default Re: Lighting pixels w/o data

    Arduino will do it happily - the FastLED library is awesome and simple to use


    Sent from my iPhone using Tapatalk

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