Arduino and PIR Sensor: Home security system

Code Arduino:

int sensor=2;

int led=13;

int buzzer=9;

int state=LOW;

int val=0;

void setup() {

 pinMode(sensor,INPUT);

 pinMode(led,OUTPUT);

 pinMode(buzzer,OUTPUT);

 Serial.begin(9600); 

}

void loop() {

val=digitalRead(sensor);

if(val==HIGH){

  digitalWrite(led,HIGH);

  digitalWrite(buzzer,HIGH);

  delay(400);

}

else{

  digitalWrite(led,LOW);

  digitalWrite(buzzer,LOW);  

}

}