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RPi + OpenELEC WS2801 needs strong color adjustments

Discussion in 'Hardware Support' started by Blu3ye, 16 June 2016.

  1. Blu3ye

    Blu3ye New Member

    Messages:
    10
    Hardware:
    RPi1/Zero
    Hi guys!

    I just followed the color calibration guide yesterday and was wondering if it is "normal" that I need to adjust for example the whitelevel values that much?

    My whitelevel goes R 255 G 83 B 35 to get a normal white.
    Also my LED stripe should be BGR as product info says but I need to set to RBG.

    Is this quite normal or is there something wrong with my stripe??
     
  2. Wastl

    Wastl New Member

    Messages:
    17
    Hardware:
    RPi2, RPi3, +PhilipsHue
    I'm using WS2801 on RPi2 with OpenELEC/LibreELEC with RGB. To get a good whitelevel I have to go down with G and B, too, but not so much as you did.
     
  3. emc2

    emc2 New Member

    Messages:
    9
    Hardware:
    RPi3
    I had to set the RGB to 255 66 40 to get good white level and all colors nearly perfect. (But it's also a matter of what color (warm, cold, ...) you choose on your TV)
    Problem is, that with such a big correction the dynamic range is very limited. But I think it is a problem with the poor LED stripes. I had choosen the cheapest on aliexpress...
    Maybe some others can write down the correction calues of their RGB stripes and write where they bought them to find out a good stripe for a god price that works well for us?!
     
    • Like Like x 1
  4. Brindosch

    Brindosch Active Member

    Messages:
    658
    Hardware:
    RPi1/Zero, RPi2, RPi3, +nodeMCU/ESP8266
    Very weird values. But i have been seen often that bad values with ws2801.
    My apa102 show a bright could white at 255 255 255, this is what you expect at these values. Looks like ws2801 may not that great.
     
  5. Blu3ye

    Blu3ye New Member

    Messages:
    10
    Hardware:
    RPi1/Zero
    So I am not the only one with that... hmm...
    I took the guide from powerpi.de and the suggested 5m LED strip from Hello Fish. I also contacted the manufacturer now to see what he will say.
    Have the feeling also, that theres a "lack of color bandwidth" but thats maybe because of changed other settings.

    EDIT:
    Can this be because of the other components in my setup like HDMI2AV converter or so? Not really right?
     
  6. Pieface

    Pieface New Member

    Messages:
    19
    Hardware:
    RPi3
    Mine is the same. I found it very difficult to get a white and yellow. Had to do a LOT of adjusting to the white levels, gamma and temperature.

    Thinking about replacing my WS2801 with APA102.
     
  7. Dirk

    Dirk Member

    Messages:
    54
    Hardware:
    RPi2, RPi3, +PhilipsHue
    I had the same Problem with my ws2801.
    255 170 120
    Then i changed to the Apa and now with
    255 255 255 White is White!
     
  8. Pieface

    Pieface New Member

    Messages:
    19
    Hardware:
    RPi3
    Is yellow yellow too?
     
  9. Dirk

    Dirk Member

    Messages:
    54
    Hardware:
    RPi2, RPi3, +PhilipsHue
    Yes all Colors Perfect!
    You only have to adjust the Colors a Little bit to Match your Tv.
     
  10. Pieface

    Pieface New Member

    Messages:
    19
    Hardware:
    RPi3
    Time to order some APA102's I think :D
     
  11. Parox

    Parox Member

    Messages:
    52
    Hardware:
    RPi1/Zero
    I think it's time to do the same ^^
     
  12. Dirk

    Dirk Member

    Messages:
    54
    Hardware:
    RPi2, RPi3, +PhilipsHue
    In my opinion that decision would be the best!
     
  13. TPmodding

    TPmodding Administrator Staff Member Administrator

    Messages:
    1,849
    Hardware:
    RPi1/Zero, RPi2, RPi3, +Arduino, +nodeMCU/ESP8266
    may you guys make a bulk order and can save some money...if you want, i can give you a email adress from a chinese seller
     
  14. penfold42

    penfold42 Active Member

    Messages:
    746
    Hardware:
    RPi1/Zero, RPi2, RPi3, 32/64bit, +Arduino, +nodeMCU/ESP8266
    I wonder if this is another strip with the wrong resistors fitted ?
     
  15. emc2

    emc2 New Member

    Messages:
    9
    Hardware:
    RPi3
    I always thought that there are only a few LED-Chip manufacturer and ws2801 or APA102 is only a matter of connectivity or the controller. But as it seems the ws2801 strips are very poor quality, or they really put the wrong resistor between chip and controller. Normally each color needs another resistor because of the different forward voltage... Or they connected the wrong resistors to the wrong color.
    Well, it was very cheap...
    @TPmodding Please give us a link to the chinese seller, so that we all can be sure to get the perfect strip ;)
     
  16. Dirk

    Dirk Member

    Messages:
    54
    Hardware:
    RPi2, RPi3, +PhilipsHue
  17. Pieface

    Pieface New Member

    Messages:
    19
    Hardware:
    RPi3
    Noob question alert, but what is the difference between all the different IPXX versions of APA102?
     
  18. Dirk

    Dirk Member

    Messages:
    54
    Hardware:
    RPi2, RPi3, +PhilipsHue
    Ip67 means the Stripe is Waterproof.
     
  19. Pieface

    Pieface New Member

    Messages:
    19
    Hardware:
    RPi3
    Ah lovely, definitely do not need those :D
     
  20. Wastl

    Wastl New Member

    Messages:
    17
    Hardware:
    RPi2, RPi3, +PhilipsHue
    36 LED/m should be enough, shouldn't it?