void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(13, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int x = analogRead(A0);
Serial.println(x);
if (x>512)
{
  digitalWrite(13, HIGH);
}

  else 
  {digitalWrite(13, LOW);

}
}