Ultrasonic Calibration rev_01

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    - Project: Ultrasonic Calibration
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-12-04 15:51:11

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Le projet consiste à réaliser un télémètre à */
    /* ultrasons utilisant un capteur HC-SR04, un écran */
    /* LCD, et 3 boutons poussoirs.  Le télémètre doit */
    /* mesurer une distance et afficher la valeur */
    /* corrigée en tenant compte de la longueur fixe de */
    /* l’appareil : 12c */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

// Includes
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

// Define pins for HC-SR04
#define TRIGGER_PIN 9
#define ECHO_PIN 10
#define MAX_DISTANCE 200 // Max distance in cm

// Define pins for buttons
#define BUTTON1_PIN 2
#define BUTTON2_PIN 3
#define BUTTON3_PIN 4

// Initialize LCD with I2C address 0x27, 16 columns and 2 rows
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Initialize ultrasonic sensor
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

// Device's fixed length in centimeters
const float device_length = 12.0;

// Variables to store button states
int button1State = LOW;
int button2State = LOW;
int button3State = LOW;

// Measurement variables
unsigned int distance_cm;
float corrected_distance;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Initialize button pins
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);

  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Ultrasound Te9le9me8tre");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read buttons
  button1State = digitalRead(BUTTON1_PIN);
  button2State = digitalRead(BUTTON2_PIN);
  button3State = digitalRead(BUTTON3_PIN);

  // Trigger ultrasonic measurement
  delay(50); // Small delay for sensor stability
  distance_cm = sonar.ping_cm();

  // Calculate corrected distance
  // Correction based on device length
  corrected_distance = distance_cm - device_length;

  // Ensure corrected distance is not negative
  if (corrected_distance < 0) {
    corrected_distance = 0;
  }

  // Display the corrected distance
  lcd.setCursor(0, 0);
  lcd.print("Dist: ");
  lcd.print(corrected_distance);
  lcd.print(" cm     ");

  // Optionally, handle button presses for additional functions
  // For this example, no specific button function is implemented

  delay(500); // Measurement interval
}

/* END CODE */