Max number of supported leds?

[julien-binard]

Super Boulot! ;)

I couldn't find the maximum supported leds for the nodemcu and the neopixel lib.
Does someone knows?
Any info of the ratio number leds and refresh rate?

I'm actually thinking of making a mod for my projector screen (lumene 240c) so about 7.4meters of led strip and for easy calculation of leds a 100 led/m ws2812b strip.
I made quite some years ago a 512 led panel with fastleds that was going quite fast but i'm wondering if running around 740 leds would be possible with a correct refresh rate.

Thanks

[Synless]

Hi !

After some google searching it seams that there is no clear answer.
I tried pumping up the LED number to a 500 LEDs and the setup is not behaving correctly.
Mind you the max number of LED has to be change on the Arduino sketch as well.
I will work on that soon.

I would encourage you to try it and report your results :)

[Synless]

Alright, after some testing it seems that passed 1470 bytes the UDP transfer is not being done correctly.

Right here I increased 180 to 181 and the serial terminal froze. So 490 LEDs is the current maximum.
The frequency was not changed the slightest, about 15Hz without any ThreadSleeping, and it stands the RGB flickering very well. The time it took the NodeMCU to perform this loop is less than a millisecond. So even with lots of LEDs the NodeMCU is not the limiting performance factor.

I will see to include a header in the payload to let the NodeMCU knows that it should wait for a second payload. Strips longer than 490 LEDs will need several payloads.
Temporary fix for a display as big as yours : using a slightly less dense LED strip :/

[julien-binard]

I'll have some time, i ordered the nodemcu (and go a few centimeters of leds to so make first tests); i'll do the big screen when moving to new house in April/May .

Thanks for the feedback!

[Synless]

Seems to work thus far.
Payloads are being sent carrying the colors for 400 LEDs, and the terminal payload triggers the color refresh. I will test it with a 10 LEDs split to test it with my scaled-down setup.
Yours to test now ;)

[julien-binard]

I just ordered 8 meters of 100led/m strip, i will setup my nodemcu once it arrives (i got a neopixel square panel somewhere for testing purpose) , set up the mediacenter/node and wait for the strips to arrive and have some fun!

[Synless]

Since I heard no news, I concider this issue as solved. Feel free to re-open it if needed.