#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>       // Library for DS1307 RTC
#include "DHT.h"

#define DHTPIN 13         // Pin where the DHT22 is connected
#define DHTTYPE DHT22     // DHT22 sensor
DHT dht(DHTPIN, DHTTYPE);

#define LED1 4            // LED connected to pin 4
#define LED2 16           // LED connected to pin 16
#define LED3 17           // LED connected to pin 17
#define LED4 5            // LED connected to pin 5

LiquidCrystal_I2C lcd(0x27, 20, 4);  // Set the LCD address to 0x27 for a 20 chars, 4-line display
RTC_DS1307 rtc;                     // Initialize RTC

// Timing variables for LED
unsigned long previousMillis = 0;
const long interval = 500;  // 500ms delay for LED sequence

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(115200);
  
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  
  // Initialize the DHT22 sensor
  dht.begin();
  
  // Initialize the RTC
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  
  // Check if RTC is running, if not set to compile time
  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running, setting the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));  // Set RTC to compile date and time
  }
  
  // Set LED pins as output
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
}

void loop() {
  // LED Sequencing logic
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    
    // Turn on LEDs from left to right
    digitalWrite(LED1, HIGH);
    delay(200);
    digitalWrite(LED1, LOW);
    
    digitalWrite(LED2, HIGH);
    delay(200);
    digitalWrite(LED2, LOW);
    
    digitalWrite(LED3, HIGH);
    delay(200);
    digitalWrite(LED3, LOW);
    
    digitalWrite(LED4, HIGH);
    delay(200);
    digitalWrite(LED4, LOW);
    
    // Turn on LEDs from right to left
    digitalWrite(LED4, HIGH);
    delay(200);
    digitalWrite(LED4, LOW);
    
    digitalWrite(LED3, HIGH);
    delay(200);
    digitalWrite(LED3, LOW);
    
    digitalWrite(LED2, HIGH);
    delay(200);
    digitalWrite(LED2, LOW);
    
    digitalWrite(LED1, HIGH);
    delay(200);
    digitalWrite(LED1, LOW);
  }

  // Display date and time on the LCD
  DateTime now = rtc.now();
  lcd.clear();
  
  // Display date in format: YYYY-MM-DD
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  lcd.print(now.year());
  lcd.print("-");
  lcd.print(now.month());
  lcd.print("-");
  lcd.print(now.day());
  
  // Display time in format: HH:MM:SS
  lcd.setCursor(0, 1);
  lcd.print("Time: ");
  lcd.print(now.hour());
  lcd.print(":");
  lcd.print(now.minute());
  lcd.print(":");
  lcd.print(now.second());
  
  // Read DHT22 sensor data
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  // Display temperature and humidity on LCD
  lcd.setCursor(0, 2);  // Set cursor to the third row
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print(" C");

  lcd.setCursor(0, 3);  // Set cursor to the fourth row
  lcd.print("Humidity: ");
  lcd.print(h);
  lcd.print(" %");

  delay(1000);  // Update every second
}