#define LED 5

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

void loop() {
  int analogWert = analogRead(A0);
  Serial.print(analogWert);

  if ( analogWert < 512 )
    digitalWrite ( LED, HIGH );
  else
    digitalWrite ( LED, LOW );  

  delay (200);
}