int led = 9; // the PWM pin the LED is attached to
      int brightness = 0; // how bright the LED is
      int fadeAmount = 5; // how many points to fade the LED by
      // the setup routine runs once when you press reset:
      void setup() {
         // declare pin 9 to be an output:
         pinMode(led, OUTPUT);
      }
      // the loop routine runs over and over again forever:
      void loop() {
         // set the brightness of pin 9:
         analogWrite(led, brightness);
         // change the brightness for next time through the loop:
         brightness = brightness + fadeAmount;
         // reverse the direction of the fading at the ends of the fade:
         if (brightness == 0 || brightness == 255) {
            fadeAmount = -fadeAmount ;
         }
         // wait for 30 milliseconds to see the dimming effect
         delay(300);
      }
      

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      Arduino - Fading LED

      uno
      arduino

      This example demonstrates the use of the analogWrite() function in fading an LED off. AnalogWrite uses pulse width modulation (PWM), turning a digital pin on and off very quickly with different ratios between on and off, to create a fading effect.

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