int Trig_pin=5;
int Echo_pin=18;
long duration;
float speed_of_sound=0.034;
float dist_in_cm;

void setup() {
Serial.begin(115200);
pinMode(Trig_pin, OUTPUT);
pinmode(Echo_pin,INPUT);
}

void loop() {
  digitalWrite(Tirg_pin,LOW);
  digitalWrite(2);
  digitalWrite(Trig_pin,HIGH);
  digitalWrite(10);
  digitalWrite(Trig_pin,LOW);
  
  duration =pulsein(Echo_pin,HIGH);

  dist_in_cm=duration*speed_of_sound/2;
  Serial.print("The distance is ::");
  Serial.println(dist_in_cm);

  delay(10);
}