#include <LiquidCrystal_I2C.h>  // LCD I2C library
#include <Ds1302.h>             // DS1302 RTC library
#include <Wire.h>               // I2C communication library

#define SERIAL_OPTION 0  // Serial communication: 1 = enabled, 0 = disabled

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address: 0x3F or 0x27

// DS1302 pin definitions
const int DS1302_CLK_PIN = 8;   // Clock pin
const int DS1302_DIO_PIN = 6;   // Data input/output pin
const int DS1302_RST_PIN = 7;   // Reset pin

// Create DS1302 object
Ds1302 rtc(DS1302_RST_PIN, DS1302_DIO_PIN, DS1302_CLK_PIN);

void setup() {
  if (SERIAL_OPTION) Serial.begin(9600);   // Initialize serial communication

  lcd.init();   // Initialize LCD
  lcd.backlight();  // Turn on LCD backlight

  rtc.halt();

  // Uncomment and set the correct date and time only once
  // rtc.setDateTime(__DATE__, __TIME__);
  // rtc.setDateTime(2022, 9, 30, 18, 13, 40); // Set year, month, day, hour, minute, second
}

void loop() {
  Ds1302::DateTime now;
  rtc.getDateTime(&now);

  if (SERIAL_OPTION) {
    Serial.print(now.year); Serial.print("/");
    Serial.print(now.month); Serial.print("/");
    Serial.print(now.day); Serial.print(" ");

    Serial.print(now.hour); Serial.print(":");
    Serial.print(now.minute); Serial.print(":");
    Serial.print(now.second); Serial.print("\n");
  }
  
  lcd.setCursor(0, 0); lcd.print("DATE: ");
  lcd.print(now.year); lcd.print("/"); lcd.print(now.month); lcd.print("/"); lcd.print(now.day);
  lcd.setCursor(0, 1); lcd.print("TIME: ");
  lcd.print(now.hour); lcd.print(":"); lcd.print(now.minute); lcd.print(":"); lcd.print(now.second);

  delay(1000);
}