SK6812 RGBWs behaving... strange?

Using Arduino LEDs and Multiplexing
1

Hey Community,

I've built my own 4x4 LED matrix using SK6812 LEDs. Trying to control them via the Adafruit NeoPixel Library, however, it behaves very strange.

This is my program:

#include <arduino.h>
#include <Adafruit_NeoPixel.h>

#define PIN 6

Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN, NEO_GRBW + NEO_KHZ800);

void setup() {
  strip.begin();
  strip.show();
}

void loop() {
  for(int i = 0; i < 16; i++) {
    strip.setPixelColor(i, 255, 0, 0, 100);
  }
  strip.show();
}

So every LED should light up in red, right? Well, this is the result:

3024×4032 2.25 MB

I then tried to use the "simple_rgbw" library from this topic, but again, it doesn't do what it's supposed to do. Here is what it looks like during its first loop:

1000×1333 346 KB

The fading, however, works without any problem so I think the data line works fine, otherwise the colors wouldn't be in this... pattern, right?
I don't really know what the problem is here, so maybe someone of you has a good idea of what's happening.

Thanks.

2

Are your SK6812 LEDs actually RGBW? A quick Google seems to show that it comes in both RGB and RGBW versions.

You can try NEO_GRB instead of NEO_GRBW and see if you get all red colors as you expect.

3

Sometimes it is just as easy. That was it, thank you very much. Confusing though, as the product description from where I bought it said they are RGBW...
Thank you!