If delay() has a low value (for example 50ms or 0.05s) the fading speed will be higher because the Arduino will keep the voltage at pin 11 at a certain value only for 50ms then executes the next for() ...

Here is a simple Arduino Camping Light project. In this design, only one push button switch is used to control the light output (from a bunch of white LEDs) between off, dim, medium, and full ...

For example at the top of Arduino.h you'll see ... starting with the green light. This loop will run forever until stopped. We now have a working traffic light simulator: Once you've uploaded ...