int irmotionPin = 4; //Pin of IR Motion Sensor
int relayPin = 8; // Pin of Relay Module

void setup(){
  Serial.begin(9600);
  pinMode( relayPin, OUTPUT); // Set Pin connected to Relay as an OUTPUT
  digitalWrite(relayPin, LOW); // Set Pin to LOW to turn Relay OFF
}

void loop(){

  while (digitalRead (irmotionPin) == HIGH) { // If Motion detected
    digitalWrite(relayPin, HIGH); // Turn Relay ON
    Serial.println("Relay is ON");
    delay(120000);
  }

  digitalWrite(relayPin, LOW); // Turn Relay OFF
  Serial.println("Relay is OFF");
  delay(500);
}