int led = 13;                
int sensor = 2;              
int state = LOW;             
int val = 0; 
int buzzer = 5;                

void setup() {
  pinMode(led, OUTPUT);     
  pinMode(sensor, INPUT); 
  pinMode(buzzer, OUTPUT);   
  Serial.begin(9600);        
}

void loop(){
  val = digitalRead(sensor);   
  if (val == HIGH) 
  {           
    digitalWrite(led, HIGH); 
    digitalWrite(buzzer, HIGH);  
    delay(100);                
    
    if (state == LOW) {
      Serial.println("Motion detected!"); 
      state = HIGH;       
    }
  } 
  else 
  {
      digitalWrite(led, LOW); 
      digitalWrite(buzzer, LOW);
      delay(200);              
      
      if (state == HIGH){
        Serial.println("Motion stopped!");
        state = LOW;      
    }
  }
}