int lightPWM = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(11, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println(lightPWM);
  analogWrite(11, lightPWM);
  lightPWM = (lightPWM > 255) ? 0 : lightPWM+=5;
  delay(300);
}