const int buzzer = 8;
const int pir = 7;
const int led = 6;
int motion;
void blink()
{
digitalWrite(led, HIGH);
delay(300);
digitalWrite(led, LOW);
delay(300);
}
void setup()
 {
 pinMode(buzzer, OUTPUT);
 pinMode(pir, INPUT);
 pinMode(led, OUTPUT);
 }
 void loop() 
 {
 motion = digitalRead(pir);
 if(motion){
 tone(buzzer, 262);
 blink();
 }
 else{
noTone(buzzer);
 }
 }