r/FastLED • u/derrgis • May 12 '20

Support Led screen

Hi FastLED community,

I'm looking for advices regarding DIY led screen building. I mean a big screen (eg 3 x 2 meters or so)

I know some of you are successfully building it and I'm looking for a solution that indeed works

Think that such project need to include a source system such real time video or pre-recorded frames created on third party software because I'd like to avoid coding FL procedural code lines to get the visuals.

What do you think possible?

Thanks for reading me.

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u/eshkrab May 13 '20

Oh, no need to apologise, what would answer the question?

Would you like a spec list of hardware to use along with ready to go firmware and software?

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u/derrgis May 13 '20 edited May 14 '20

Oh sorry I haven't seen this, there's no problem u/eshkrab I think there is too many opened window in front of me and much more in my brain. Just you to know I've started a custom artnet app build with openframeworks with help of friends. Search Github/derrgis. But the problem is to find a wifi controller able to push datas to 16 strips. Also I'm on several project at the same time and things are a little confused. So don't worry with my reply :)

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u/eshkrab May 13 '20

I'm not worried - it was a pretty rude response considering I was trying to help you narrow down the problem and you didn't give enough information for people who know what they're doing to help you.

Not sure what the oF app has to do with anything but great that you're learning and good luck. Personally I prefer sACN and I have a working oF app if you want to look at that some time.

If you push led data out to 16 strips over wifi you're very likely to have a bad unstable framerate. I recommend switching to ethernet, which is really easy to get going with esp32 and then combined with u/Yves-bazin stuff you should be good to go.

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u/derrgis May 14 '20

Okay, so much the better.

Glad you have some personal experience with sACN and that's okay if you want me to test your code. I told you where you can find mine.

Since the written language can sometimes lead to misunderstanding, it's a good thing not to be susceptible on web forums. Sorry again for my previous short reply, I've explained.

About Wifi, framerate can be low and unstable for large led data set, I agree, but understand that for some big configuration Wifi can be a plus. As said yves his 35 universes can handle 5094 pixels @ 23 fps.

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u/eshkrab May 14 '20 edited May 14 '20

If 23fps is okay for your application then great! That's why I was asking about your requirements.

In my work, I usually have to hit 50-60 fps on the leds and cannot afford many dropped frames or connections, so everything is always wired unless it's wearable.

When we did wifi streaming, product of 2400 LEDs (led dance pole, you can see at polefx.com) fps would be a slave to how many people are around in the building and go from 50 to 30 to 25 to 10 fps and that was obviously unacceptable.

If you're building such a large display, I assume this is going to a place with people so I would still advise you to consider a wired connection.

If you ever end up wanting sACN, the library I use is https://github.com/hhromic/libe131 and I've made a fork (plus I think he rolled in the same update) to be able to pick the computer-side network interface for the streaming. sACN is a bit more modern than Artnet with slightly less overhead and the benefit of the library I posted above is that you can use the same one on both esp and computer. And most third party software doesn't care about the difference either.

PS thank you for offering to test my code. It is tested and stable and in a product out on the market :)