#include <LiquidCrystal_I2C.h>

#define BUTTON 7

LiquidCrystal_I2C lcd (0x27, 20, 4);

void setup() {
  Serial.begin(9600);
  //Serial.println("Début du programme :)");
  lcd.begin(20, 4);
  pinMode(BUTTON, INPUT);

  lcd.print("-------------------");

  lcd.setCursor(0,1);
  lcd.print("Appuyer sur le btn");

  lcd.setCursor(0,2);
  lcd.print("pour continuer");

  lcd.setCursor(0,3);
  lcd.print("-------------------");

  //int etatBtn = digitalRead(BUTTON);
  
 /*while(digitalRead(BUTTON) == 0);
  delay(5);*/

  while (!digitalRead(BUTTON));
  delay(5);
  

  while (digitalRead(BUTTON));
  delay(5);

    lcd.clear();  
    lcd.setCursor(0,0);
    lcd.print("T.ECOULE:");
}

void loop() {
  int nbSecondes = (millis() / 1000) %60;  
  int nbMinutes = (millis() / 60000) %60;
  int nbHeures = (millis() / 3600000) %24;
  int nbJours = (millis() / 86400000) %365;

  //static unsigned long int i = 0;
  //unsigned long int milliSecondes = millis();
  //int temperature = 22;
  const int CHAINE_MAX_CHAR = (20+1);
  //const char MSG_VALEUR[] = "i vaut : ";
  char uneChaine[CHAINE_MAX_CHAR];
  //"i vaut ??"

  lcd.setCursor(9,0);
  snprintf(uneChaine, 
          CHAINE_MAX_CHAR, 
          "%02d:%02d:%02d:%02d", 
          nbJours,
          nbHeures,
          nbMinutes, 
          nbSecondes);

  //snprintf = sprintf mais avec un nombre maximum --> evite les buffler overflow ('n' EST LA DIFFÉRENCE)
  //snprintf(uneChaine, CHAINE_MAX_CHAR, "i vaut %010lu, \n", i );
  lcd.print(uneChaine);

 


}