Driver for WS2812 RGB LEDs (NeoPixels, ...)

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torwag
Posts: 168
Joined: Fri Dec 13, 2013 9:25 am

Re: Driver for WS2812 RGB LEDs (NeoPixels, ...)

Postby torwag » Tue Feb 07, 2017 8:09 am

Beside of deshipus comment,
many sources on the net state that you should use some resistors and blocking capacitors in front of the first LED since they tend to be quite easily harmed by voltage spikes. Honestly, speaking I never did this and did not kill a single LED yet. Just wanted to mention.
Also take into account that the 3.3 V logic level might seems to be sufficient on the test-bench but the 3 m wire from the controller to the LED-stripe in the final application might create a lot of head-scratching ;)

Hmmm. thinking more about it, I wonder if the logic-level theory fits... since, if the first LED only receives rubbish digital values, it just forwards digital rubbish at now 5V to the other LEDs. However, I remember to read that the level shifters in the LED are more forgiving then other parts of the LED circuitry. Ultimately, I guess deshipu is right to say it would be much better to adapt the logic level.

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deshipu
Posts: 974
Joined: Thu May 28, 2015 5:54 pm

Re: Driver for WS2812 RGB LEDs (NeoPixels, ...)

Postby deshipu » Tue Feb 07, 2017 11:38 am

My sources:

https://hackaday.com/2017/01/25/ws2812b ... originals/
http://hackaday.com/2017/01/20/cheating ... data-line/

Re-reading this again, I agree that it doesn't quite add up in my theory -- it's probably some kind of a timing problem.


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