// Define the pin to which the OUT pin of PIR sensor is connected
int pirPin = 2;
// Define the pin to which the relay module is connected
int relayPin = 3;

// Variable to store the PIR sensor output
int pirState = 0;

void setup() {
  // Set the PIR pin as input
  pinMode(pirPin, INPUT);
  // Set the relay pin as output
  pinMode(relayPin, OUTPUT);

  // Initialize relay module to OFF state
  digitalWrite(relayPin, LOW);

  // Start serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the state of the PIR sensor
  pirState = digitalRead(pirPin);

  // Check if motion is detected
  if (pirState == HIGH) {
    Serial.println("Motion detected!");
    // Turn on the relay (or perform any action you want)
    digitalWrite(relayPin, HIGH);
  } else {
    Serial.println("No motion");
    // Turn off the relay (or perform any action you want)
    digitalWrite(relayPin, LOW);
  }

  // Delay for stability
  delay(500);
}