/*
  Fading LED
  This example shows how to fade an LED using the analogWrite() function.
  The circuit:
  - LED attached from digital pin 9 to ground through 220 ohm resistor.
*/

int ledPin = 9;  // LED connected to digital pin 9

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // fade in from min to max in increments of 5 points:
  for (int fadeValue = 0; fadeValue <= 255; fadeValue += 5) {
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);
    // wait for 30 milliseconds to see the dimming effect
    delay(30);
  }

  // fade out from max to min in increments of 5 points:
  for (int fadeValue = 255; fadeValue >= 0; fadeValue -= 5) {
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);
    // wait for 30 milliseconds to see the dimming effect
    delay(30);
  }
}