int pwm = 11;

void setup() {
  pinMode(pwm, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  analogWrite(pwm,255);
  Serial.println("Maximum Brightness 50%");
  delay(750);
  analogWrite(pwm,127);
  Serial.println("Medium Brightness 50%");
  delay(750);
  analogWrite(pwm,0);
  Serial.println("Minimum Brightness 50%");
  delay(750);
}