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SOLVED SK6812 RGBWW : How to connect to a RPI3B+ ?

Discussion in 'Hardware Support' started by Darkbrigan, 1 December 2020.

  1. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    My apologies if the threat already exist, but I do not find them.

    I just received my SK6812 led , when I plug the power supply only it doesn't turn on.

    What I need to do to test the leds before cut to add behind the tv ?

    I have a power supply 5v 10A and use little connector to plus the cable + and - on it.

    Thank you in advance
     
  2. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have connected to the gipo18 and just a green led appear see the capture
     

    Attached Files:

  3. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have changed the configuration in hyperion to ws281x rpi pwm and the led works but not all the led
    What kind of configuration do I need to choose. If it's SPI SK6812 could you explain how to configure correctly because no led works with this options
    sorry for the many post :)
     
  4. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have change to gpio10 and choose spi sk6812 but all the led still white and no picture when I launch a movie
     
  5. jeroen warmerdam

    jeroen warmerdam Raspberry 3B / APA102 / Hyperion.NG relaisbox

    Messages:
    377
    Hardware:
    RPi3
    go to second tab and select the grid of your strip, probably still needs settings in this area/ >> led layout ( basics in Json file have like 40 leds activated)

    ws281x PWM is okay
     
  6. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have tried to change but now only the bottom LEDs works and when I return to the first setting it still the same...
    Which one is better GPIO10 with SK6812 or GPIO18 with led ws281x PWM ?
     
  7. jeroen warmerdam

    jeroen warmerdam Raspberry 3B / APA102 / Hyperion.NG relaisbox

    Messages:
    377
    Hardware:
    RPi3

    where you connected the pin on the PI determs the GPIO output number.
    there's schematics for that, every pin has a function

    You have SPI and PWM driven leds and GPIO's, you have to find the right GPIO and setting thats all :)
     
  8. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I'm noob :) How can I find the right GPIO ? just by testing all?
     
  9. jeroen warmerdam

    jeroen warmerdam Raspberry 3B / APA102 / Hyperion.NG relaisbox

    Messages:
    377
    Hardware:
    RPi3
    depends on the PI type you have, pinout you can find on this forum or github/raspberry pi forum
     
  10. jeroen warmerdam

    jeroen warmerdam Raspberry 3B / APA102 / Hyperion.NG relaisbox

    Messages:
    377
    Hardware:
    RPi3
    Last edited: 1 December 2020
  11. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    Don't worry , maybe someone can tell me a litlle more
    I will try to find the right gpio, I have seen this information but it doesn't help me :)
    thanks for your time
     
  12. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have changed the configuration : Used GPIO 10 with pwm now the LEDs are flickering with all color and still white few seconds
    If someone used SK6812 with Rpi3b please help :). I just use usb hdmi capture
     

    Attached Files:

  13. NeeeeB

    NeeeeB Active Member

    Messages:
    237
    Hardware:
    RPi3, +Arduino, +nodeMCU/ESP8266
    Should'nt you check the box "use RGBW protocol" ?
    also, I would suggest to insert a 470 Ohm resistor on the data line (the green cable of your leds).
     
  14. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I tried with RGBW protocol and still the same..
    I use Libre Elec with Kodi Leia and I have installed Alpha9 of Hyperion
    I'm very disappointed :(
    I tried with gpio 18,12,10,11 nothing work correctly
     
    Last edited: 2 December 2020
  15. NeeeeB

    NeeeeB Active Member

    Messages:
    237
    Hardware:
    RPi3, +Arduino, +nodeMCU/ESP8266
    The 470 Ohm resistor as I suggested is worth the try.
    Looks like your data line is not "stable" which is causing all this flickering.
     
  16. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    I have changed the connection now I have mutliple color, but when I try to test the LEDs it doesn't work

    When I plug GPIO10 it flickering, when I try other GPIO the LEDs works but not with the movie or the test on YouTube.

    I used GND on the raspberry...I'm lost, if someone uses this light with raspberry pi3B, please help me, tell me which gpio I need to use.

    Thank you in advance
     
  17. Darkbrigan

    Darkbrigan New Member

    Messages:
    27
    Hardware:
    RPi3
    Update if someone have the same issue : I use GPIO10 + GND pin34 to turn on the LEDs on Hyperion I use PMW 281x and select RGBW protocol
    The LEDs are flickering but I have order resistance 330 ohms/330R I hope this solves it.
    When I received it, I will update the post to confirm or not.
    If someone has another idea doesn't hesitate :)
     
  18. Axh3ll

    Axh3ll New Member

    Messages:
    3
    Hardware:
    RPi3
    Hi,
    I have the same setup as yours, rpi3b+ and sk6812rgbw strip led.
    I not able to get this setup working too.
    I did same tests as you with a 470 ohms resistor on data line but its the same, the led strip didn't react a all or in eratic blinking.
    I'm waiting for a new rpi4, will test with a raspbian + Kodi + hyperion-ng fresh install and give a feedback.
    I hope that we are going to find what is wrong with this config, I fell that we are not so far to find the solution
     
  19. Axh3ll

    Axh3ll New Member

    Messages:
    3
    Hardware:
    RPi3
    I bought a 3.3V to 5V level shifter, works well now with PWM or SPI.
     
  20. jeroen warmerdam

    jeroen warmerdam Raspberry 3B / APA102 / Hyperion.NG relaisbox

    Messages:
    377
    Hardware:
    RPi3
    so this means that data signal from GPIO is too low voltage for this type of ledstrip and needs to be cranked up , i think its the type of ledstrip that's sensitive for correct data voltage input because i already made two LED setups with SPI directly on GPIO's and worked in one time. Data output on GPIO is 3,3 volts but ledstrip wants to receive 3,5 volts that 0.2 volts sometimes causes problems :)

    i made the setup with WS2801 and APA102, no problem whatsoever.