#define MOTION_SENSOR_PIN 2  
#define BUZZER_PIN 3        


int motionDetected = 0;    

void setup() {

  Serial.begin(9600);
  pinMode(MOTION_SENSOR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  motionDetected = digitalRead(MOTION_SENSOR_PIN);
  if (motionDetected == HIGH) {
    Serial.println("Motion detected!");
    tone(BUZZER_PIN, 1000); 
    delay(500);             
    noTone(BUZZER_PIN);
  }
  delay(100);
}