D2 is not providing 5V as High Signal

[holymoly]

Hello,

I was just stumbling across youtube and found your nice firmware. One Issue I see is the the direct connection of D2 to the WS2812 Pin.
The output of the Wemos D2 pin is providing a voltage around 3.3V as a High signal.
http://henrysbench.capnfatz.com/henrys-bench/arduino-projects-tips-and-more/esp8266ex-gpio-high-and-low-input-thresholds/

The WS2812 expect at least 70% of the Power supply voltage as a High signal. Which means 5V*0,7=3,5V

I had the same problem on my board. If you are lucky with the tolerances of the involved components it might work, but often the Color of the LED will flicker or showing wrong colors. To fix this you can put Level Shifter in between (a cheap 74HCT595 could be used).

Keep on Coding