void setup() {
  pinMode(11, OUTPUT);
}
void loop() {
  analogWrite(11,0);
  delay(1000);
  analogWrite(11,63);
  delay(1000);
  analogWrite(11,127);
  delay(1000);
  analogWrite(11,191);
  delay(1000);
  analogWrite(11,255);
  delay(1000);
}