#include <RTClib.h> // pour DS3231 ou DS1307

RTC_DS3231 rtc;

const int latchPin = 8;
const int clockPin = 12;
const int dataPin  = 11;

const byte digitPins[4] = {2, 3, 4, 5}; // Contrôle des digits

const byte numbers[10] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};
byte DPvalue = 0b00000000;
int sec=0;
void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
    digitalWrite(digitPins[i], LOW);
  }

  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);

  rtc.begin();
}
void loop() {
  // Affiche "1234"
  DateTime now = rtc.now();
  sec=now.second();
   int digits[4] = {
    now.hour() / 10,
    now.hour() % 10,
    now.minute() / 10,
    now.minute() % 10
  };

   for (int i = 0; i < 4; i++) {
    // Éteindre tous les digits avant d'afficher
    for (int j = 0; j < 4; j++) {
      digitalWrite(digitPins[j], HIGH);
    }
   
  if (i == 1 && sec % 2 == 0 ) {
      DPvalue = numbers[digits[i]];
      DPvalue |= 0b10000000; // Active le DP (bit 7 = 1)


 // Envoyer les segments
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, DPvalue);
    digitalWrite(latchPin, HIGH);
    digitalWrite(digitPins[i], LOW);

    }
  else{
    // Envoyer les segments
    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, MSBFIRST, numbers[digits[i]]);
    digitalWrite(latchPin, HIGH);
    digitalWrite(digitPins[i], LOW);
    

    }
    delay(20); // court délai
  }
}