int Pir=5;
int b=8;
int pirs;
void setup(){
  pinMode(Pir,INPUT);
  pinMode(b,OUTPUT);
  Serial.begin(9600);
}

void loop() {
pirs=digitalRead(Pir);
Serial.print("PIR Sensor output= ");
Serial.println(pirs);
delay(2000);
if(pirs==1){
tone(b,1000);
Serial.println("Motion is detected");}
else
{noTone(b);
Serial.println("Motion is not detected");
}

}