My question is not directly related to FastLED, but to the WS2812B.

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1

My question is not directly related to FastLED, but to the WS2812B.

I use serveral WS2812 or SK6812 strips or matrixes. The latest product I received, some 8x8 WS2812 matrixes show a strange power-on behaviour:

They are fully switched on. My other WS2812 don’t show this behaviour: They are off, the SK6812 seem to remember last state for a while.

So: Is anyone aware of this power-on behaviour? Are these matrixes cheap fakes? Has anyone heard of fake products?

I tried to tie VIN to GND or Vsupply, but this does not change the behaviour. The data sheet does not mention the power-on behaviour.

This behaviour is not only annoying, its also dangerous:

64 RGB-LED that are fully switched on consume that much current that the microcontroller (ESP8266) that controls them does not always start up at all (even with a 5V 6A(!!) supply), so the matrix stays on. This way it overheats quite quick…

(If I manage to send data to the matrix, it works fine - till reset…)

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Possible clone. I some times get random pixels lighting up on poweruo so I usually shut off all pixels in the start of my setup code in the controller.

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This has been posted many times here with many diferent chipsets of pixels. The consensus is that the quiality of strip/matrux is poor.