I built an RGB LED strip controller with a Wemos D1 mini, using this schematic:
On the phone I have a color picker and just roll over it and the LED color changes accordingly, but sometimes I hear a whining noise (not from the 5V regulator, but from the power supply) and another strange thing is when I measure the voltage between red LED and 12V (I get something around 5.6V) but I should measure 12V, because this is what I measure on green and blue LEDs. I measure this value even if the code from arduino IDE is "analog write 255 -> RED LED, and for GREEN and BLUE is 0".