Metal and life detector

const int buzzerPin =  11; 
// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  pinMode(buzzerPin,OUTPUT); 
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(A0);
  // print out the value you read:
  Serial.println(sensorValue);
  delay(1000);        // delay in between reads for stability
  if(sensorValue<1000)
  {
   digitalWrite(buzzerPin,HIGH); 
  }

  else
  {
    digitalWrite(buzzerPin,LOW); 
  }
}