#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 9
#define ECHO_PIN 10
#define BUTTON1_PIN 8
#define BUTTON2_PIN 11
#define LCD_ADDRESS 0x27
#define LCD_COLS 16
#define LCD_ROWS 2

LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLS, LCD_ROWS);

float distance;
float length;
float width;
float area;
bool button1_pressed;
bool button2_pressed;
float addValue;

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();

  distance = 0;
  length = 0;
  width = 0;
  area = 0;
  button1_pressed = false;
  button2_pressed = false;
  addValue = 0.05;

  // عرض اسمك في البداية
  lcd.setCursor(0, 0);
  lcd.print("BEN MANSOUR");
  lcd.setCursor(0, 1);
  lcd.print("BEN AKEZOUH");
  delay(2000); // عرض الاسماء لمدة ثانيتين
  lcd.clear();
}

void loop() {
  distance = measureDistance() + addValue;

  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" m");

  button1_pressed = digitalRead(BUTTON1_PIN) == LOW;

  if (button1_pressed) {
    length = distance;

    lcd.setCursor(0, 1);
    lcd.print("Length: ");
    lcd.print(length);
    lcd.print(" m");

    while (digitalRead(BUTTON1_PIN) == LOW);
  }

  button2_pressed = digitalRead(BUTTON2_PIN) == LOW;

  if (button2_pressed) {
    width = distance;
    area = length * width;

    lcd.setCursor(0, 1);
    lcd.print("Area: ");
    lcd.print(area);
    lcd.print(" m2 ");

    while (digitalRead(BUTTON2_PIN) == LOW);
  }
}

float measureDistance() {
  float duration;

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);

  return (duration * 0.034 / 2) / 100;
}