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Lots and lots and lots of LEDs
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Lots and lots and lots of LEDs

by benforta on Sun Oct 08, 2017 3:25 pm

Hi,

I am working on a project that will have lots of RGB LEDs, lots as in 4,000+, of which 2,000+ could be lit at any time. I can use DotStar or NeoPixel. I am not worried about power issues at this point, right now I am trying to figure out how to control them.

My preference would be to use Raspberry Pi (as the project needs Internet access, and I also have lots of existing Python code that I'd rather not rewrite in C). However, I am having a really hard time getting the pixels to behave well with the Pi. Plus, I am seeing that the libraries aren't really designed for strips thousands of pixels long. And FadeCandy is designed for far too few LEDs.

I could use Arduino or Teensy, etc. if needed, but I have only ever driven a few hundred LEDs that way. Has anyone driven thousands?

Are there are other options I am not thinking of? How are any of you driving thousands of RGB LEDs?

Thanks!

--- Ben

benforta
 
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Re: Lots and lots and lots of LEDs

by adafruit_support_bill on Sun Oct 08, 2017 4:07 pm

The Teensy with an OctoWS2811 adapter is what you are looking for.
https://www.adafruit.com/product/1779
https://www.adafruit.com/product/3266
The OctoWS2811 library from PJRC is designed to handle thousands of LEDs:
https://www.pjrc.com/teensy/td_libs_OctoWS2811.html

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Re: Lots and lots and lots of LEDs

by benforta on Sun Oct 08, 2017 4:21 pm

Thanks, I'll give that a try. It looks like that supports NeoPixel, but not DotStar. Correct? Any way to use that with a RPi, or do you know of something similar for RPi?

--- Ben

benforta
 
Posts: 29
Joined: Wed Dec 25, 2013 10:34 am

Re: Lots and lots and lots of LEDs

by adafruit_support_bill on Sun Oct 08, 2017 4:38 pm

The OCtoWS2811 is designed for Neopixels (WS2811/WS2812).

he Pi is not capable of reliably driving Neopixels. If you want to use a Pi, then DotStars are the way to go. But I don't know of any libraries specifically designed for large numbers of DotStars.

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Re: Lots and lots and lots of LEDs

by benforta on Sun Oct 08, 2017 4:44 pm

Then NeoPixels it is.

One last question. Looks like Teensy has no on-board WiFi. Do you know which Arduino compatible WiFi option will work well with Teensy and the OctoWS2811?

As always, thanks for your help!

--- Ben

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Posts: 29
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Re: Lots and lots and lots of LEDs

by adafruit_support_bill on Sun Oct 08, 2017 7:33 pm

There are a number of workable WiFi options. There is a thread on that topic here in the Teensy forums: https://forum.pjrc.com/threads/42215-Ad ... Teensy-3-x

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Please be positive and constructive with your questions and comments.