int pirPin = 2;    
int ledPin = 3;
int buzzerPin = 4;

void setup() {
  pinMode(pirPin, INPUT);       
  pinMode(ledPin, OUTPUT);      
  pinMode(buzzerPin, OUTPUT);   
  Serial.begin(9600);           
  Serial.println("System Initialized");
}

void loop() {
  int motion = digitalRead(pirPin); 
  if (motion == HIGH) {
   
    digitalWrite(ledPin, HIGH);    
    digitalWrite(buzzerPin, HIGH); 
    Serial.println("Motion detected!");
    delay(1000); 
  } else {
    
    digitalWrite(ledPin, LOW);     
    digitalWrite(buzzerPin, LOW); 
  }
}