WS2812B RGB Shield
WS2812B RGB Shield (single pin)~

From the Wemos ws2812b shield specs the DATA pin is connected to D2 of the Wemos.
Tasmota Settings~
In the Configuration -> Configure Module page, select the following: * D2 GPIO4 : 07 WS2812

Tasmota Main~
After reboot of the device the dark-bright slider and toggle button are displayed to control the led.
