const int PWM_PIN = 11;

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

void loop() {
  int value = analogRead(A0); //10 bit Wert

  int helligkeit = map(value,0,1023,255,0);

  analogWrite(PWM_PIN, helligkeit);  //8bit
}