It's for printer event LEDs not for case light sorry
Posts made by Midgardian
RE: NeoPixel LEDs controled by M109
Yes I am Sure ,
In Marlin 2.0 you need to Use M109 and Not M104 to activate the case light
if you use M104 the neopixel leds don't work.
if you use M109 the leds goes from green to red until the température is reach and go to white at printing start.
So we need to use M109 and not M104