I have a similar problem! I'm having trouble using the Arduino software. I started using the web version, it's very cool, thanks for this opportunity! I bought the boards as written in the description, D1 mini and D1 mini pro. D1 mini works correctly, I checked several boards. And on the D1 mini pro (with an external antenna) the neopixel works the same way as in the screenshots above. I tried installing different numbers of LEDs - the first one works as it should, and the rest periodically change color. frequency is unclear. I would like to use the board with an external antenna. I just can’t figure out if my board is faulty or if the mini pro has the same problem?
Try the code in this branch.
I have to make some other check before i publish it, but it fixes the errors in the Arduino IDE for me.
Remember to copy the new library over from the libraries folder!
_Originally posted by @dmitrylive in https://github.com/AronHetLam/ATEM_tally_light_with_ESP8266/issues/82#issuecomment-1784222626_