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(Trig_pin, LOW);
  delayMicroseconds(2);
  digitalWrite(Trig_pin, HIGH);
  delayMicroseconds(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);
 }