int outPin = 11 ;  // one of the PWM pins

void setup()
{
    Serial.begin(9600);
    pinMode(outPin, OUTPUT);
}

void loop()
{
  int i;
  for(i=0; i<15; i++){
    analogWrite(outPin, 10*i);
    delay(100);                  
  }
  analogWrite(outPin, 0);
  delay(500);
}