ogiewon, did you ever have any luck in adding neopixel support to ST_Anything?? I’m so excited to see someone else with interest in adding neopixel support to smartthings. I’ve been looking into this for months, but unfortunately I don’t have the programming experience needed to write code for smartthings.
The esp8266 is certainly able to control neopixels/ws2812b LEDs. I’ve used the two together in many projects, but sadly, I’ve found no way to incorporate them into smartthings without someone with more coding experience doing the heavy lifting. The uses for controlled neopixels around the house are endless!
From my experience, code for neopixels on arduinos is run perfectly fine on an esp8266 without any modifications. If you have experience with those neopixels being run off of an arduino, the same code and library use would apply. It would seem that you would need a device handler/smartthings code that would interpret tiles/color settings/on or off/brightness inputs from the smartthings app into the corresponding library call of the neopixels library on the esp8266.
I’m pretty well versed in neopixels, so if you need someone to test your projects, let me know!