#include <Wire.h>
#include <RTClib.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>

RTC_DS3231 rtc;
const int tempPin = 6;
DHT dht(tempPin, DHT22);

void setup() {
  Wire.begin();
  rtc.begin();
  dht.begin();
  
  // Set the pins for 74HC595 ICs
  int latchPins[] = {4, 5, 6};
  int clockPins[] = {5, 6, 6};
  int dataPins[] = {6, 6, 4};
  
  for (int i = 0; i < 3; i++) {
    pinMode(latchPins[i], OUTPUT);
    pinMode(clockPins[i], OUTPUT);
    pinMode(dataPins[i], OUTPUT);
  }
  
  // Uncomment the following line if you want to set the time on the RTC
  // rtc.adjust(DateTime(__DATE__, __TIME__));
}

void shiftOutData(int latchPin, int dataPin, int clockPin, byte data) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, data);
  digitalWrite(latchPin, HIGH);
}

void loop() {
  DateTime now = rtc.now();
  int hour = now.hour();
  int minute = now.minute();
  int second = now.second();
  int dayOfWeek = now.dayOfTheWeek();

  // Display time in 6 digits on the 2nd 74HC595
  shiftOutData(5, 6, 1, hour / 10);
  shiftOutData(5, 6, 2, hour % 10);
  shiftOutData(5, 6, 3, minute / 10);
  shiftOutData(5, 6, 4, minute % 10);
  shiftOutData(5, 6, 5, second / 10);
  shiftOutData(5, 6, 6, second % 10);

  // Display date in 8 digits on the 3rd 74HC595
  shiftOutData(6, 4, 7, now.day() / 10);
  shiftOutData(6, 4, 8, now.day() % 10);
  shiftOutData(6, 4, 9, now.month() / 10);
  shiftOutData(6, 4, 10, now.month() % 10);

  // Display temperature in 2 digits on the 1st 74HC595
  float temperature = dht.readTemperature();
  if (!isnan(temperature)) {
    int tempInt = int(temperature);
    shiftOutData(4, 5, 0, tempInt / 10);
    shiftOutData(4, 5, 11, tempInt % 10);
  }

  // Display day of the week using 7 LEDs
  byte days[] = {B11000000, B11111001, B10100100, B10110000, B10011001, B10010010, B10000010};
  shiftOutData(6, 4, 12, days[dayOfWeek]);

  delay(1000); // Update every second
}