Hi all! Today I am going to create a lighthouse using pulse width modulation, which means the LED will be turn on and off very quickly, so you just see it lighter or darker. For this purpose there is a function in Arduino analogWrite(). It takes two arguments: pin and value from 0 to 255 (how often per second pin will be on high level of voltage).
As you can see from the picture we also need to use one resistor (220 Ohm).