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  1. #1
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    Default WS2811 pixel compatibility

    I was told by Ray Wu the the WS2811 pixels were compatible with the 1804. Unfortunately that doesn't appear to be the case. I have some samples in hand but so far haven't been able to make them work.

    As of right now, the E68x controller series will not work with the WS2811s. I'm trying to get some better info from Ray to try to get this sorted out.
    The Sandevices E680/E681/E682 Pixel Controllers, part of the[SIZE=3] [COLOR=red]P[/COLOR][COLOR=orange]I[/COLOR][COLOR=blue]X[/COLOR][COLOR=lime]E[/COLOR][COLOR=magenta]L[/COLOR] [COLOR=red]P[/COLOR][COLOR=lime]R[/COLOR][COLOR=blue]O[/COLOR][COLOR=red]J[/COLOR][COLOR=magenta]E[/COLOR][COLOR=cyan]C[/COLOR][COLOR=red]T[/COLOR]
    [URL="http://www.sandevices.com"]www.sandevices.com[/URL][/SIZE] <-email jim at

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    Default Re: WS2811 pixel compatibility

    Quote Originally Posted by jstjohnz View Post
    I was told by Ray Wu the the WS2811 pixels were compatible with the 1804. Unfortunately that doesn't appear to be the case. I have some samples in hand but so far haven't been able to make them work.

    As of right now, the E68x controller series will not work with the WS2811s. I'm trying to get some better info from Ray to try to get this sorted out.
    I was looking at the data sheet for the 2811 and there looks to be a slight difference between the two for the manchester timing so you might want to check it again. It's also possible that they strapped it for slow speed.

    I'm assuming that you were running the 2811's on 5V not 12V

    Oh, I found the data sheet on the Ausi forum in the data sheet wiki page.

    http://auschristmaslighting.com/wiki.../ba/WS2811.pdf

    http://auschristmaslighting.com/wiki.../49/TM1804.pdf

    John

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    Default Re: WS2811 pixel compatibility


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    Default Re: WS2811 pixel compatibility

    It's been a while since I have looked t thgis but I believe it turned out that what were supposed to be 2811s were in fact TLS3001s. I received a selection of several of the newer pixel types from Ray recently, I just need to sit down and test all of the 'new' types.
    The Sandevices E680/E681/E682 Pixel Controllers, part of the[SIZE=3] [COLOR=red]P[/COLOR][COLOR=orange]I[/COLOR][COLOR=blue]X[/COLOR][COLOR=lime]E[/COLOR][COLOR=magenta]L[/COLOR] [COLOR=red]P[/COLOR][COLOR=lime]R[/COLOR][COLOR=blue]O[/COLOR][COLOR=red]J[/COLOR][COLOR=magenta]E[/COLOR][COLOR=cyan]C[/COLOR][COLOR=red]T[/COLOR]
    [URL="http://www.sandevices.com"]www.sandevices.com[/URL][/SIZE] <-email jim at

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    Default Re: WS2811 pixel compatibility

    I finally got around to testing "real" WS2811s. The issue was timing. When setting up for the original 1804 pixels, I found 3 different data sheets with 3 different timing specs, so what I did was find the range where they worked, and set the final timing in the middle of that range. It turns out that that particular timing is just a hair off for the WS2811s.

    So now the WS2811s are working, they will be setup as 1804s, I just need to verify that the 1804s still work properly, and of course I can't find my string of 1804s to test that...
    The Sandevices E680/E681/E682 Pixel Controllers, part of the[SIZE=3] [COLOR=red]P[/COLOR][COLOR=orange]I[/COLOR][COLOR=blue]X[/COLOR][COLOR=lime]E[/COLOR][COLOR=magenta]L[/COLOR] [COLOR=red]P[/COLOR][COLOR=lime]R[/COLOR][COLOR=blue]O[/COLOR][COLOR=red]J[/COLOR][COLOR=magenta]E[/COLOR][COLOR=cyan]C[/COLOR][COLOR=red]T[/COLOR]
    [URL="http://www.sandevices.com"]www.sandevices.com[/URL][/SIZE] <-email jim at

  6. #6
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    Default Re: WS2811 pixel compatibility

    Quote Originally Posted by jstjohnz View Post
    I finally got around to testing "real" WS2811s. The issue was timing. When setting up for the original 1804 pixels, I found 3 different data sheets with 3 different timing specs, so what I did was find the range where they worked, and set the final timing in the middle of that range. It turns out that that particular timing is just a hair off for the WS2811s.

    So now the WS2811s are working, they will be setup as 1804s, I just need to verify that the 1804s still work properly, and of course I can't find my string of 1804s to test that...
    Jim how did you go in the end with the 2811, you state that you got this running using the 1804 protocol, im wondering if you came across any issues as there are some slight timing differences in the data sheet.

    The 2811 series offers great value to the community with crazy prices like a 5 metre strip with 30 LED and 10 IC per metre at $36, the whole range of the 2811 is much cheaper than anything else out there and with so many with tight budgets this is a very important IC to support as it then offers far better value for any controller supporting it.
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    Default Re: WS2811 pixel compatibility

    Quote Originally Posted by fasteddy View Post
    Jim how did you go in the end with the 2811, you state that you got this running using the 1804 protocol, im wondering if you came across any issues as there are some slight timing differences in the data sheet.

    The 2811 series offers great value to the community with crazy prices like a 5 metre strip with 30 LED and 10 IC per metre at $36, the whole range of the 2811 is much cheaper than anything else out there and with so many with tight budgets this is a very important IC to support as it then offers far better value for any controller supporting it.
    There was a lot of confusion regarding the timing of the 1804s, with several different data sheets giving different numbers. The 1804s worked over a range of about 600kbps to about 850kbps. I picked a value near the middle of this range, I think about 700kbps. As it turns out, this is just a hair too slow for the WS2811s. So now my timing is set right at 800kbps, and that value works for the WS2811s and the 1804s.

    Has anyone come across any of these pixels that are configured for the 'slow' mode?
    The Sandevices E680/E681/E682 Pixel Controllers, part of the[SIZE=3] [COLOR=red]P[/COLOR][COLOR=orange]I[/COLOR][COLOR=blue]X[/COLOR][COLOR=lime]E[/COLOR][COLOR=magenta]L[/COLOR] [COLOR=red]P[/COLOR][COLOR=lime]R[/COLOR][COLOR=blue]O[/COLOR][COLOR=red]J[/COLOR][COLOR=magenta]E[/COLOR][COLOR=cyan]C[/COLOR][COLOR=red]T[/COLOR]
    [URL="http://www.sandevices.com"]www.sandevices.com[/URL][/SIZE] <-email jim at

  8. #8
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    Default Re: WS2811 pixel compatibility

    Well I don't think I've seen a lower price for pixels as this:

    http://www.aliexpress.com/fm-store/7...ring-IP68.html

    Now that we can drive the WS2811 IC this and other WS2811 pixels may be the way to go unless you need the 12 bit option that the TLS3001 gives.

  9. #9
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    Default Re: WS2811 pixel compatibility

    Jim,
    Your set up will need a slow and a Fast option. Slow operates NRZ @ 400KHz, while fast operates NRZ @ 800KHz.

    Whilst the option exists on the IC Data sheet, I haven't seen the rate dedatiled on any product sheets.
    [B][I]Matt[/I][/B]

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  10. #10
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    Default Re: WS2811 pixel compatibility

    Jin are you implementing a NRZ protocol as per the data sheet or the Pseudo NRZ as per Tabor testing over at ACL?

    Tabor suggests
    1 ____
    1 => _2 3 4 5 Ie 4 out of 5 bits are high

    _ 2 3 4 5
    0 =>1 _____ Ie 4 out of 5 bits are low
    [B][I]Matt[/I][/B]

    You too can become a Supporting member of DIYC.
    Check it out [URL="http://doityourselfchristmas.com/forums/payments.php"]here[/URL]

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