#include <LiquidCrystal_I2C.h>
#define POT                 A0
#define MIN_POTENT          0
#define MAX_POTENT          1023
#define MIN_CONVERTI        0
#define MAX_CONVERTI        10
#define LCD_ADRESSE_I2C     0x27
#define LCD_NB_COLONNE      20
#define LCD_NB_LIGNE        4
#define BOUTON              2
LiquidCrystal_I2C ecranLCD(LCD_ADRESSE_I2C, LCD_NB_COLONNE, LCD_NB_LIGNE);

void setup() {
  pinMode(BOUTON, INPUT);
ecranLCD.begin(LCD_NB_COLONNE, LCD_NB_LIGNE);
ecranLCD.print("Bonjours 420!");
delay(2000);
ecranLCD.clear();
}

void loop() {

  byte etatBouton = digitalRead(BOUTON);

  while(etatBouton == 1)
  {
    ecranLCD.backlight();
  }


int valeurDuPotentiometre = analogRead(POT);
int volume = map(valeurDuPotentiometre,
                         MIN_POTENT, MAX_POTENT,
                         MIN_CONVERTI, MAX_CONVERTI);
ecranLCD.setCursor(1 , 0);
ecranLCD.print("Valeur du pot: ");
ecranLCD.print(valeurDuPotentiometre);
ecranLCD.print("   ");
ecranLCD.setCursor(1 , 1);
ecranLCD.print("Volume: ");
ecranLCD.print(volume);
ecranLCD.print(" ");
}