void setup() {
 pinMode(13, OUTPUT);
 pinMode(2, INPUT);
 Serial.begin(9600);
}

void loop() {
  int x=digitalRead(2);
  if(x==0)
  {
    digitalWrite(13, LOW);
    Serial.println("No objected detected");
    delay(500);
  }
  else
  {
    digitalWrite(13, HIGH);
    Serial.println("Object detected");
    delay(500);
  }
}