int outPin = 11;

void setup() {
  // put your setup code here, to run once:
  pinMode(outPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 0 ; i <= 255; i+=20){
    digitalWrite(outPin,i);
    delay(500);
  }
  delay(1000);
}