// Constants for Ultrasonic Sensor
const int trigPin = 7;
const int echoPin = 6;

// Constants for PIR Motion Sensor
const int pirPin = 8;

// Constants for Buzzer
const int buzzerPin = 9;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Ultrasonic Sensor
  long duration;
  float distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;

  // PIR Motion Sensor
  int motion = digitalRead(pirPin);

  if (motion == HIGH) {
    digitalWrite(buzzerPin, HIGH);  // Turn on the buzzer
    Serial.println("Intruder detected!");

    // Add any additional actions here, e.g., sending a notification
  } else {
    digitalWrite(buzzerPin, LOW);  // Turn off the buzzer
  }

  // Print sensor data to the serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm | Motion: ");
  Serial.println(motion == HIGH ? "Detected" : "Not Detected");

  delay(500);  // Adjust delay as needed
}