In the above tutorial, is there a limit on the number of LEDs the Arduino signal pin 5 can drive? I understand the 5V power requirements but not the signal pin limit. Thanks.
I think it depends on your application.
The WS2812B works with onewire protocol. Which means all LEDs are controlled by the same data pin.
If you have a very long strip, the signal will take some time to reach the pins that are far away. Which means you can have some delay in the response of the LEDs.
If the strip is super super long, the signal may become “weaker” at the end of the strip and the LEDs won’t work properly. However, I don’t have an idea on limit of the number of LEDs regarding the data pin.