int pir=13;
int led=12;
int buzz=11;


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

void loop() {
  int msig=digitalRead(pir);
  if (msig==HIGH)
  {
    Serial.println("motion detected");
    digitalWrite(led, HIGH);
    tone(buzz,1000);
    delay(2000);     
  }else{
    Serial.println("motion undetected");
    digitalWrite(led , LOW);
    
  }

}