My WS2812B 10 LED strip glows white without connecting Data link from my WEMOS D1 mini. I tried even uploading many different sketches but no changes. I am new to neopixel LED's and don't know how to sort out this issue.
My WS2812B 10 LED strip glows white without connecting Data link from my WEMOS D1 mini.
The turn on state of an undriven string of these is not determined and it tells you nothing.
That is a 3V3 processor so you only get 3V3 signals out of it. Have you got a level converter to bring this up to 5V, or are you powering the strip from 3V?
Have you got a series resistor and a large capacitor across the supply.
In fact how are you wiring it up. Please post a schematic of your circuit showing all the power supply wiring an post a short simple code of that you are using to test the strip.
I am powering the LED strip with a 5V power bank. I have connected the WEMOS thru my PC USB port. I have connected the Data line from WEMOS to LED strip with a 330 ohm resistor in series. I have not connected any capacitor as I don't have any. I will be buying one and connect. Regarding a wiring diagram I will make it and upload as right now I am outside.
Is it normal to have the strip Glow white, if not receiving any signal from micro controller? This is my first time working addressable LEDs.
s it normal to have the strip Glow white, if not receiving any signal from micro controller?
It is nether normal or abnormal. It seems that these things can power up in any state before a signal is added. I have had them power up all off or all on, it means nothing.
So what have you tried, post the exact code you are using. Things we look for is have you initialised the libiary correctly for your processor. These things need tight timing and it may be that your processor is not running at the same speed as the software libiary expects it to run. A professional would look at the output signal on an oscilloscope to see what is coming out, but as you don't have one then we have to look at all the clues.