/*
   #DigitalClockLcd24_2
   This Sketch Displays Time, Date, Day, & Temp
   on a 16x4 LCD
   CH Smalll III
   April 02, 2025
   Modified February 06, 2026
   Backlight Remote On/Off

   Inspired by the Information Listed Below:
   Created by ArduinoGetStarted.com
   This example code is in the public domain
   Tutorial page: https://arduinogetstarted.com/tutorials/arduino-lcd-clock
   Board: Arduino Mega or Mega 2560
   Com Port: COM5 (Arduino Mega or Mega 2560)
*/

// Required Libraries
#include <Wire.h>
#include <TimeLib.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

// Create Objects
LiquidCrystal_I2C lcd(0x27, 16, 4);
RTC_DS3231 rtc;

// Array for Days of the Week
char daysOfTheWeek[7][12] = {"Sunday   ", "Monday ", "Tuesday", "Wednesday", "Thursday ", "Friday  ", "Saturday"};

// Variables for Backlight On/Off Control
const int relayPin = 10;
const int buttonPin = 12;

// Parameters for Backlight On/Off Control
bool pressed = false; // Buton Pressed
bool wasPressed = false; // Button Released
bool relayToggle = false; // Toggle Relay On/Off

void setup() {
  rtc.begin(); // Initialize RTC
  lcd.init(); // initialize LCD
  lcd.backlight(); // Activate LCD Backlight

  // Pin Modes for Relay and Button
  pinMode(relayPin, OUTPUT);
  pinMode(buttonPin, INPUT);

  /*
     Automatically Sets the RTC to the Date & Time on PC this Sketch was Compiled
     Only needs to be Run if RTC has Lost Power or Time Reset is Required
  */
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  lcd.clear();
}

void loop() {
  latch(); // Latches Relay On
  
  DateTime now = rtc.now();

  int year = now.year();
  int month = now.month();
  int day = now.day();
  int hour = now.hour();
  int minute = now.minute();
  int second = now.second();

  // Display Time in 24 Hour Format
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  printDigits(hour);
  lcd.print(":");
  printDigits(minute);
  lcd.print(":");
  printDigits(second);

  // Display Date in Month/Date/Year Format
  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  printDigits(month);
  lcd.print("/");
  printDigits(day);
  lcd.print("/");
  printDigits(year);

  // Display Day of Week
  lcd.setCursor(0, 2);
  lcd.print("Day:  ");
  lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);

  // Display Temperature in Degrees Fahrenheit
  lcd.setCursor(0, 3);
  lcd.print("Temp: ");
  float Temp = (rtc.getTemperature()); // Create Variable for Temperature
  lcd.print(Temp * 1.8 + 32); // Converts Temp from Celsius to Fahrenheit
  lcd.print(" ");
  lcd.print(char(223)); // Prints the Degree Symbol
  lcd.print("F");
 
  delay(1000); // Update Display every Second 
}

void printDigits(int digits) {
  // Utility Function for Digital Clock Display: Prints Leading 0
  if (digits < 10)
    lcd.print('0');
  lcd.print(digits);
}

void latch() {
  wasPressed = pressed;
  pressed = digitalRead(buttonPin);
  
  // Button Pressed
  if (pressed && !wasPressed) {
    relayToggle = !relayToggle;
  }

  digitalWrite(relayPin, relayToggle);
}