Distance Measurement with Arduino

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/* Ultrasonic sensor header file  
 * Defines a class for the ultrasonic sensor
 * (c) Stefan Hager 2022
 */
 
 
 #ifndef _SENSOR_H_
 #define _SENSOR_H_
 
 class Sensor
 {
   private:
    int trigg, echo;  
   public:
    Sensor (int _trigg, int _echo); // constructor
    int measureDistance();
 };
 
 #endif

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/* Ultrasonic sensor implementation file  
 * Implements a class for the ultrasonic sensor
 * (c) Stefan Hager 2022
 */

#include "sensor.h"
#include "Arduino.h"

Sensor::Sensor (int _trigg, int _echo) 
{
  trigg = _trigg;
  echo = _echo; 
  pinMode(trigg, OUTPUT);
  pinMode(echo, INPUT);
}

int Sensor::measureDistance ()
{   int dur = 0;
    // Clears the trigPin condition
    digitalWrite(trigg, LOW);
    delayMicroseconds(2);
    // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
    digitalWrite(trigg, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigg, LOW);
    // Reads the echoPin, returns the sound wave travel time in microseconds
    duration = pulseIn(echo, HIGH);
    // Calculating the distance
    int dist = duration * 0.017
    return dist;
}

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// Ultrasonic Sensor - Test Program
// (c) Stefan Hager 2022

#include "sensor.h"


// PIN 2 = trigger PIN 3 = echo
Sensor sensor(2,3);
  
void setup() 
{
  Serial.begin(9600); 
  Serial.println("Sensor - Test"); 
}
void loop() 
{
  int dist = sensor.measureDistance();
  // Displays the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(dist);
  Serial.println(" cm");
  delay(500);
}