Hello, First time posting in here..

(Tommy Norris) #1

First time posting in here…
I’ve got some SK9822’s that I’m trying to hook up but I think there is something that I’m missing / not defined correctly. I’ve tested both strips with a stand-alone tester and they work fine. Both exhibit the same issues, I am hoping someone has seen this behavior and knows what to update.

Strips are running off of a Teensy 3.5 hooked up to an Nvidia Shield using the app “Android Ambilight Application”. This worked with WS2182’s but I saw inconsistent colors so I got rid of that and wanted to “upgrade” with the SK9822’s.

(Marc Miller) #2

Hello and welcome!
From the first video it looks like you are powering from both ends, yes?

What does a volt meter read at each end across the pos/neg connections of the strip? And then what does it read in that middle area where it’s flickering?

If the power has dropped too much you might need to do another power injection in the middle there somewhere.

(Tommy Norris) #3

@marmil yes that’s correct, power from both ends. There are 140 LEDs total on the strip. I will try checking the power but I think it is okay as my stand-alone tester was simply wired up to the end I had the teensy 3.5 connected so should have the same power.

(Jeremy Spencer) #4

Looks like a data speed issue to me
try turning the data rate down to 12Mhz or even 6Mhz, you can go as low as 1Mhz (the same as the adafruit library).

Lots of vendors randomly ship APA102Cs or SK9822s, APA102Cs are a bit slower.

You can also try defining the LEDs as APA102Cs.


(Tommy Norris) #5

@Jeremy_Spencer Thanks! I was eye’n that line but wasn’t too sure what to do with it… I’ll try that this evening and let ya’ll know how things go…

(Tommy Norris) #6

Currently the code has the following line:
FastLED.addLeds<LED_TYPE, LED_PINS, COLOR_ORDER>(leds, ledCount);
So I’m assuming I’ll need to change that to:
FastLED.addLeds<LED_TYPE, LED_PINS, DATA_RATE_MHZ(12), COLOR_ORDER>(leds, ledCount);

(Tommy Norris) #7

Got it working! Thank you for the assistance. Primary reason was I was not using pin 11 for data on my teensy. I also had to adjust the data rate to 6mhz as Jeremy suggested.

Just need to clean up my wires and tune the colors some.

If anyone is interested in this setup let me know. I am going to contact the author of Android Ambilight Application again to let him know what had to be done so he can maybe make some minor adjustments to his code so the variables are more easily adjustable. Also, so the changes required can be documented.

(Marc Miller) #8

Super. And thank you for the feedback.

(Will Tatam) #9

Yeah that looks exactly the issue I’ve had with a few strips till I drop the data rate

(Jordan Whaley) #10

Same issue with some of these as well. Better power distribution and adjusting the MHZ solved the problem