APA102 or SK9822 WHITE ONLY pixels?
Has anyone here used these before? I cant find a data sheet for them…I’m assuming that they protocol is the same StartFrame(4Bytes)+LEDFrame(2bytes?)+EndFrame(4bytes) the one thing im not sure about is wether the LED frames are 2 bytes [GlobalBrightnessByte][White level byte] or 4 bytes as the RGB models [GlobalBrightnessByte][White level byte][NOTHING BYTE][NOTHING BYTE] ???
I was under the impression that they would be controlled the same as an RGB strip, so CRGB(255,128,0) would turn on one of the leds to max, and another to 50% brightness for example.
I haven’t actually used them myself though.
@marmil Yeah that’s what I’m curious about… Would love to know if they have 3 white LEDs to replace the RGB LEDs…or if there is just 1 LED and what byte its connected to…
On Adafruit’s page where they sell the individual APA102 5050 White LEDs, (and also APA102 WWW strips in cool white and warm white) it mentions they uses the same driver chip as RGB strips, and also that there seems to be 3 individual white dies inside each pixel.
To me they sounds like they are built the same and operate the same as the RGB ones (except have white dies in place of the colors).
Also, on Adafruit’s site I didn’t see any mention of needing to use a different library for the White Dotstars vs the RGB ones, which again makes me believe the operate the same way.
@marmil Yep i saw that as well, but the data sheet they provide is the RGB model…so it looked sus.
@Leon_Yuhanov Saw one other relevant post by one of the Adafruit admins:
https://forums.adafruit.com/viewtopic.php?f=47&t=106232&
“Declare the strip as RGB. Then, when setting pixels, you can either pass the same values for red, green and blue (providing 256 brightness levels)…or, if you want finer control, you can set the three values independently, just that they’re not really RGB in that case, but their combined sum determines the pixel brightness (766 levels).”
@marmil Oh brilliant thanks mate!