#include <Wire.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C lcd(0x27, 20, 4);
// Define the type of sensor and the pin it's connected to
#define DHTPIN 25      // Example pin for DHT22 sensor
#define DHTTYPE DHT22 // DHT 22  (AM2302)

DHT dht(DHTPIN, DHTTYPE);

 // Address for LCD I2C, change according to your module

// Pin Definitions for Relays, Buttons, LEDs, Buzzer
const int relayPins[] = {19, 18, 5, 17};  // Example GPIO pins for relays
const int buttonPins[] = {35, 32, 26, 27}; // Example GPIO pins for buttons
const int ledPins[] = {15, 2, 4, 16};      // Example GPIO pins for LEDs
const int buzzerPin = 15;                  // Example GPIO pin for buzzer

// Button States
bool buttonState[] = {false, false, false, false};

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  dht.begin();

  lcd.begin(16, 2);
  lcd.backlight();

  // Initialize relay pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW);  // Initially OFF
  }

  // Initialize button pins with internal pull-down resistors
  for (int i = 0; i < 4; i++) {
    pinMode(buttonPins[i], INPUT_PULLUP);
  }

  // Initialize LED pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);  // Initially OFF
  }

  // Initialize buzzer pin as output
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);  // Initially OFF

  // Clear LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Load Control");

  // Additional initialization code as needed
}

void loop() {
  // Read button states
  for (int i = 0; i < 4; i++) {
    buttonState[i] = digitalRead(buttonPins[i]);

    if (buttonState[i] == LOW) {  // Button pressed
      // Toggle corresponding relay
      digitalWrite(relayPins[i], !digitalRead(relayPins[i]));

      // Example: Turn LED on when relay is ON
      digitalWrite(ledPins[i], digitalRead(relayPins[i]));

      // Example: Activate buzzer briefly
      digitalWrite(buzzerPin, HIGH);
      delay(50);
      digitalWrite(buzzerPin, LOW);

      // Update LCD if needed
      updateLCD(i, digitalRead(relayPins[i]));
    }
  }

  // Read temperature and humidity from DHT22 sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Print temperature and humidity to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C\tHumidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Update LCD with temperature and humidity data
  updateTemperatureLCD(temperature, humidity);

  // Other continuous operations or checks can be placed here
}

void updateLCD(int index, bool state) {
  lcd.setCursor(0, 1);
  lcd.print("Relay ");
  lcd.print(index + 1);
  lcd.print(": ");
  lcd.print(state ? "ON " : "OFF");
}

void updateTemperatureLCD(float temperature, float humidity) {
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C  Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");
}