int releNO = 13;
int inputPir = 25;
int val = 0;

void setup()
{
  pinMode(releNO, OUTPUT);
  pinMode(inputPir, INPUT);
 // pinMode(sensorLDR, INPUT);
  Serial.begin(9600);
}

void loop()
{
  val = digitalRead(inputPir);
  Serial.println(val);
      if(val == HIGH)
    {
      digitalWrite(releNO, HIGH);
      delay(500);
    }
    else
    {
      digitalWrite(releNO, LOW);
      delay(500);
    }
  }