WS2811 RGB strip lights up in groups of three
I have bought a 5m "30 IP20 Whitre PCB" led strip, http://www.aliexpress.com/item/WS2811-led-strip-5m-30-48-60-leds-m-IP30-65-67-10-16-20-pcs/32658513954.html
When I light them, they always light up in groups of three. So they are addressable, but not individually. If I light up only the first pixel, the first three pixels light up (in the same color). If I light up 12 pixels, 36 pixels light up. If I light the first pixel green, second red, I get three green followed by three red.
I get the same behavior NeoPixels and FastLED.
Have I gotten a crap delivery? Or am I doing something wrong?
Since the strip is 12V, it probably has three leds in series, right? So any 12V strip is likely to only be addressable in groups of 3?
Looking at the product picture indeed there is only one WS2811 IC per each 3 LEDs. So... I'm afraid the behaviour that you describe is that LED strip can do...
I have around here some WS2801 LED strips and there's one IC per LED.
Just found this in the product description : "LED Type: 1 WS2811 IC control 3 LED Chip,"
Thanks @Daniel-Oliveira. I read the part about 3 leds but thought that one IC controlled three leds individually. But since WS2811 can only control one address per chip, it makes sense that they light up in groups of 3.
Oh well, you always learn something
Well... I'm sorry for you, but at least now everyone that reads this thread will be aware.
@Daniel-Oliveira yup. For me, electronics is all about learning new stuff. Either from other people's mistakes, or by my own mistakes
Thanks for the quick answer.
Tetnobic last edited by
@mfalkvidd So where you buy the right led strip ?
Thanks for your reponse
Nicklas Starkel last edited by
@mfalkvidd , quite OT, but how do you power these?
I have them as well and when I calculate how much amp they should draw it is quite much!
However, when I check what they actually draw is quite low. Around 3-4A on full bright white.
Do not really know what I should aim for because you can find nice 5A or less quite easily while above this you would have to go with big ugly power supplys.
And it's a shame they work in 5V only as 12V would be much better for me (and get more A out of as well from smaller power supplys)
@Nicklas-Starkel yep, that is a problem, at least in theory.
However, I have been powering my arcade game screen from a 2.1A USB powerpack without problems. So maybe they don't use as much power as they are specified for.
I am considering buying a good 230VAC->12VDC adapter and use one or a few of these to get 5V: https://www.aliexpress.com/item/5A-XL4015-DC-DC-4-38V-to-1-25-36V-24V-12V-9V-5V-Step-Down/32713638689.html
If you find anything nice, please let me know.