int DATA_PIN=2;
int LED=13;

void setup() 
{
  pinMode(DATA_PIN, INPUT);
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}

void loop() 
{
  int value=digitalRead(DATA_PIN);
  Serial.println("DATA_PIN_VALUE : ");
  Serial.println(value);
  delay(1000);
  if(DATA_PIN == LOW)
  {
    digitalWrite(LED, HIGH);
  }
  else
  {
    digitalWrite(LED, LOW);
  }
}