int irSensorPin = 7;// IR sensor pin
int relayPin = 6; //Relay Pin

void setup() {
  Serial.begin(9600);  // Initialize serial communication
  pinMode(irSensorPin, INPUT);  // Set the IR sensor pin as an input
  pinMode(relayPin, OUTPUT); // Set the IR sensor pin as an output
}

void loop() {
  int irSensorValue = digitalRead(irSensorPin);// Read the state of the IR sensor
  if (irSensorValue == 0)
  {
    digitalWrite(relayPin , HIGH);// if detected switch the relay into ON state
    delay(2000); // remain the switching ON for 2 seconds
  }
  else
  {
    digitalWrite(relayPin,LOW); // if not detected switch the relay into OFF state
  }

  delay(500); 
}