#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

// LCD setup (20x4 with I2C)
LiquidCrystal_I2C lcd(0x27, 20, 4); // Change address if needed (0x27 or 0x3F)

// DHT22 setup
#define DHTPIN 19
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Relay pins
#define RELAY1_PIN 13
#define RELAY2_PIN 12

// Variables
float temperature = 0;
float humidity = 0;
bool relay1State = false;
bool relay2State = false;

void setup() {
  Serial.begin(115200);
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
  
  // Initialize DHT sensor
  dht.begin();
  
  // Initialize relays
  pinMode(RELAY1_PIN, OUTPUT);
  pinMode(RELAY2_PIN, OUTPUT);
  digitalWrite(RELAY1_PIN, HIGH); // Assuming HIGH is OFF (change if needed)
  digitalWrite(RELAY2_PIN, HIGH); // Assuming HIGH is OFF (change if needed)
  
  delay(2000); // Give sensors time to initialize
}

void loop() {
  // Read temperature and humidity
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  // Check if readings failed
  if (isnan(temperature) || isnan(humidity)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("DHT22 Error!");
    delay(2000);
    return;
  }
  
  // Control relay1 based on temperature
  if (temperature > 60) {
    digitalWrite(RELAY1_PIN, LOW); // ON
    relay1State = true;
  } else if (temperature < 60) {
    digitalWrite(RELAY1_PIN, HIGH); // OFF
    relay1State = false;
  }
  
  // Control relay2 based on humidity
  if (humidity < 60) {
    digitalWrite(RELAY2_PIN, LOW); // ON
    relay2State = true;
  } else if (humidity > 60) {
    digitalWrite(RELAY2_PIN, HIGH); // OFF
    relay2State = false;
  }
  
  // Update LCD display
  lcd.clear();
  
  // Line 1: Temperature and Humidity
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature, 1);
  lcd.print("C");
  
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity, 1);
  lcd.print("%");
  
  // Line 3: Relay 1 status
  lcd.setCursor(0, 2);
  lcd.print("Relay1: ");
  lcd.print(relay1State ? "ON " : "OFF");
  lcd.print(" (Temp>60)");
  
  // Line 4: Relay 2 status
  lcd.setCursor(0, 3);
  lcd.print("Relay2: ");
  lcd.print(relay2State ? "ON " : "OFF");
  lcd.print(" (Hum<60)");
  
  // Add some delay between readings
  delay(2000);
}