// Ultrasonic - Library for HR-SC04 Ultrasonic Ranging Module.
// Rev.4 (06/2012) - J.Rodrigo ( www.jrodrigo.net ) - www.ardublog.com
// more info at https://www.abonnel.fr/electronique/lois-et-composants/500-capteur-de-distance-ultrasons#principe

#include "Ultrasonic.h"

#define echoPin 9 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 8 //attach pin D3 Arduino to pin Trig of HC-SR04

Ultrasonic sensor(trigPin,echoPin); // Trig et Echo
 
// defines variables
int distance; // variable for the distance measurement

void setup() {
  Serial.begin(9600);trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed
  Serial.println("Ultrasonic Sensor HC-SR04 Test"); // print some text in Serial Monitor
  Serial.println("with Arduino UNO R3 and Ultrasonic.h");
}

void loop () {
  distance = sensor.Ranging(CM);  // CM or INC
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(100); // 100 ms
}