int trigger = 14;
int echo = 12;
int pir=13;
int buz=16;
void setup() {
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buz,OUTPUT);
  pinMode(pir,INPUT);
}

void loop() {
  int actualdistance = ultrasonic();
  Serial.println(actualdistance);
  delay(1000);
  const int IP=digitalRead(pir);
  Serial.println(IP);
  delay(100);
  if(IP==1 && actualdistance <=200)
  {
    tone(buz,1000);
    delay(1000);  
  }
  else
  {
    noTone(buz);
    delay(1000);  
  
  }
  
}
int ultrasonic ()
{
  digitalWrite(trigger, LOW);
  delay(10);
  digitalWrite(trigger, HIGH);
  delay(100);
  digitalWrite(trigger, LOW);
  int distance = pulseIn(echo, HIGH);
  // return(distance);
  return (distance* 0.034 / 2) + 1;
}