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Thread: A DMX controller for multiple RGB pixel strings

  1. #701
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by Twinkleclaus View Post
    I upgraded a couple of my e680's from 2.06 to 2.020 and was hoping that the Sequence Errors stopped. They didn't. I am still seeing almost a 1-to-1 correlation between Packets Received and Sequence Errors. This happens when I am sending to more than 1 universe (eg: S1=1, S2=2, S3=3, S4=4). I am seeing this when running the da_e131 utility and LSP 2.
    Looks like I am seeing the same thing now when running 4 universes (vixen). I wonder if its related to the webserver (as S4 shows 0)? The sequence errors = packets received -1. Same issue on 2.06 and 2.20.

    It doesn't create a perceptible problem in the pixel output (of course universe 4 is off while the webserver is up)

  2. #702
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by jstjohnz View Post
    Which trace got zapped? The fuse should protect the board (although I haven't tried reversing the polarity to test that theory). Did you have power coming in via the pixel power connector or via the small 2-terminal block?

    Why don't you ship it back to me and let me have a look at it.
    It was the trace up near the programming header pins. I was powering at the pixels, with the jumper on. So I tried the small board power terminal blocks, and I get LED activity. I think the fuse is toast, not surpisingly. I will do some tests later today. If it doesn't work, I'll let you know, and take you up on your offer. I am hopefully optimistic!

    Erik
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  3. #703
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by budude View Post
    Well - I tried a 100 ohm resistor on the data line and got nothing at all. I started with lower values and crept up to the point where it would stop working at around 40 ohms but it didn't seem to make any difference and the problem was still visible.
    OK. That didn't quite go to plan! I do remember Jim saying that the 1804s seem to be more sensitive to cable length than the other pixel types. So maybe the sensitivity to series resistance is similarly high.

    Another thought.... You're running the strip at 12V. Any chance you can drop the supply voltage a volt or two? The signalling voltage from the E680 will be measured as a percentage of the chip voltage (which is related to the 12V).

    Other than that... its a different chip to the 1804. might still be a timing issue.

  4. #704
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by erm213 View Post
    It was the trace up near the programming header pins. I was powering at the pixels, with the jumper on. So I tried the small board power terminal blocks, and I get LED activity. I think the fuse is toast, not surpisingly. I will do some tests later today. If it doesn't work, I'll let you know, and take you up on your offer. I am hopefully optimistic!

    Erik
    It works by powering the board at the small terminals. The board worked like a charm. I checked the fuse, and it was busted. I am happy that I didn't fry my board like I thought!!

    Budude, I downloaded SACNView, but then I tried the fader, I was getting sequence errors like crazy. I'm betting it was user error. I am going to make a quick sequence in Vixen that fades the first few leds, and see if I see the flicker.

    Erik
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  5. #705
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by erm213 View Post
    It works by powering the board at the small terminals. The board worked like a charm. I checked the fuse, and it was busted. I am happy that I didn't fry my board like I thought!!

    Budude, I downloaded SACNView, but then I tried the fader, I was getting sequence errors like crazy. I'm betting it was user error. I am going to make a quick sequence in Vixen that fades the first few leds, and see if I see the flicker.

    Erik
    You will need to bridge that damaged trace, it ties controller ground to pixel ground.
    Sandevices E682/6804

  6. #706
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by jstjohnz View Post
    You will need to bridge that damaged trace, it ties controller ground to pixel ground.
    It has been jumpered, along with the fuse for now until I can get a replacement in there.

    Thanks,

    Erik
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  7. #707
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    Default Re: A DMX controller for multiple RGB pixel strings

    Update:

    I ran the tests that budude did. I am seeing the flickering too...

    Here is a RGB+W fade using the E680:
    http://youtu.be/Io0SDafcD10

    Here is whole strip white fade on the E680:
    http://youtu.be/MknjEKf_5gA

    And here is the same strip being driven by my arduino. I didnt see the flickering.
    http://youtu.be/-UlcCcOIbgk

    Erik
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  8. #708
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    Default Re: A DMX controller for multiple RGB pixel strings

    Thanks for the extra testing Erik! I played around with the 2.06(fixed) code a bit trying to guess what parameters to change so played around with the "slow" chip timing values - there are a couple places with 150nS delay loops and a final smaller loop. I found that if I put the smaller loop at the end of the "fast" chip loop that it reduced the amount of flicker when performing the 3-pixel test - but not much help with the all-channel test. I played with several values but could not make things work right.

    Jim - not sure if you would have the time but I would be more than willing to ship you one of my strips for you to take a look at.

    Anyway - I also took some videos - not sure how helpful they are but can't hurt:

    3-pixel test (I blocked the 3 pixels to show the flashing on the fourth):



    150-pixel test (flashing more noticable with doing full white ramps - around 1:20):

    Last edited by budude; 08-29-2011 at 02:01 AM.
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  9. #709
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    Default Re: A DMX controller for multiple RGB pixel strings

    There are two possibilities. Either this is a timing issue, or these pixels have a logic threshold that is marginal for the E680s 3.3v outputs. If someone is willing to send me a strip that is showing this issue I can run some tests.
    Sandevices E682/6804

  10. #710
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    Default Re: A DMX controller for multiple RGB pixel strings

    Quote Originally Posted by budude View Post
    Thanks for the extra testing Erik! I played around with the 2.06(fixed) code a bit trying to guess what parameters to change so played around with the "slow" chip timing values - there are a couple places with 150nS delay loops and a final smaller loop. I found that if I put the smaller loop at the end of the "fast" chip loop that it reduced the amount of flicker when performing the 3-pixel test - but not much help with the all-channel test. I played with several values but could not make things work right.

    Jim - not sure if you would have the time but I would be more than willing to ship you one of my strips for you to take a look at.

    Anyway - I also took some videos - not sure how helpful they are but can't hurt:

    3-pixel test (I blocked the 3 pixels to show the flashing on the fourth):



    150-pixel test (flashing more noticable with doing full white ramps - around 1:20):

    If you need my address, email me jim at sandevices dot com.
    Sandevices E682/6804

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