Arduino PWM

int ledPin = 11;    // LED connected to digital pin 9

void setup()  { 

  // nothing happens in setup 

} 

void loop()  { 

  

  // fade in from min to max in increments of 5 points:

  for(int fadeValue = 1 ; fadeValue <= 98; fadeValue +=5) { 

    // sets the value (range from 0 to 255):

    analogWrite(ledPin, fadeValue);         

    // wait for 30 milliseconds to see the dimming effect    

    delay(5);                            

  } 

  // fade out from max to min in increments of 5 points:

  for(int fadeValue = 150 ; fadeValue >= 1; fadeValue -=5) { 

    // sets the value (range from 0 to 255):

    analogWrite(ledPin, fadeValue);         

    // wait for 30 milliseconds to see the dimming effect    

    delay(5);                            

  }

  

  // fade in from min to max in increments of 5 points:

  for(int fadeValue = 25 ; fadeValue <= 70; fadeValue +=20) { 

    // 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 = 250 ; fadeValue >= 15; fadeValue -=20) { 

    // sets the value (range from 0 to 255):

    analogWrite(ledPin, fadeValue);         

    // wait for 30 milliseconds to see the dimming effect    

    delay(50);    

    

  }

      

 }          

Felipe Martinez, Sergio Roman, Sara Toro, Karen Angulo