I'm looking at controlling a ws2811 strip and I have seen mention that you should share the same ground between the strip and the controller, which does make sense. I do not currently have a proper power supply that will supply the full range of 12,5 and 3 volts but what I do have is one of these breadboard power supplies:


If using a correctly rated 12v power supply into this am I able to take a feed from the 12v line and hook the strip up to that and still have the rest function correctly?


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    AFAIK the majority of ws2811 strips are powered at 5V; if you have a 12V one this may work, provided that you give the strip enough current (consider 60mA for each LED at 5V, or 60mA for three LEDs if you have the 12V version with 3 LEDs per strip segment) – frarugi87 Dec 4 '18 at 13:37
  • Its definitely a 12v one (I have measured it to make sure it was not just mislabelled), which caught me off guard given what I had read, it may be because it is a slightly longer strip at 5m. I will work out the draw as you have suggested to make sure. Thank you very much for your answer, exactly what I needed to know! – CRLF Dec 4 '18 at 13:55
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    You are correct, that looks spot on. 3 LED's per chip. This is the strip I have, they were on a dirt cheap offer. amazon.co.uk/DreamColor-MINGER-Waterproof-Flexible-Lighting/dp/… – CRLF Dec 4 '18 at 14:31
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    12v->3.3v on an LDO driving an ESP32 will get quite hot, maybe hot enough to shut down the 1117-3.3. Even on the TO-220 version, I need an inch or two of heatsink to keep them under burning hot to the human touch. I would get a cheap adjustable buck converter or a bigger package LDO – dandavis Dec 4 '18 at 18:33
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    12v to 5v will generate almost as much heat as 12v to 3.3v, so probably. – dandavis Dec 5 '18 at 16:31

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