#include <HCSR04.h>

HCSR04 distSensor(5, 4); //initialisation class HCSR04 (trig pin , echo pin, number of sensor)

void setup() { 
  Serial.begin(9600);

  pinMode(4, INPUT);
  pinMode(5, OUTPUT);
}

void loop()
{
  Serial.println(distSensor.dist()); 
  delay(100);                       
}