#include <LiquidCrystal.h>
#include <DHT.h>
#define DHTPIN 2        // Pin connected to the DHT22 sensor
#define DHTTYPE DHT22   // DHT 22 (AM2302)

// Initialize the LCD
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);

// Define the DHT sensor type and pin
#define DHTTYPE DHT22   // DHT22 can be used too
#define DHTPIN 2

DHT dht(DHTPIN, DHTTYPE);

// Relay pins
const int relayHumidifier = 3;
const int relayHeater = 4;

// Desired setpoints
float desiredHumidity = 85.0;
float desiredTemperature = 28.0;

void setup() {
  lcd.begin(16, 2);
  dht.begin();
  
  // Initialize relay pins
  pinMode(relayHumidifier, OUTPUT);
  pinMode(relayHeater, OUTPUT);
  
  // Ensure relays are off initially
  digitalWrite(relayHumidifier, HIGH);
  digitalWrite(relayHeater, HIGH);
  
    lcd.print(" AUTO RH-TEMP. ");
  delay(2000);
  lcd.clear();
   lcd.print(" CONTROL PROJECT  ");
  delay(1000);
  lcd.clear();
  lcd.print("  BY SAGAR VERMA  ");
  delay(2000);
  lcd.clear();
 lcd.print(" MTECH (PSPE) ");
  delay(1000);
  lcd.clear();
  lcd.print(" GUIDED BY ");
  delay(1000);
  lcd.clear();  
  lcd.print("PANKAJ SIR");
  delay(2000);
  lcd.clear();
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  
  // Check if readings are valid
  if (isnan(humidity) || isnan(temperature)) {
    lcd.setCursor(2, 0);
    lcd.print("Sensor Error");
    return;
  }
  
   // Display the temperature and humidity on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  delay(1000);  // Wait for 2 seconds before refreshing the data

  // Control humidifier based on humidity
  if (humidity < desiredHumidity) {
    digitalWrite(relayHumidifier, LOW); // Turn on humidifier
  } else {
    digitalWrite(relayHumidifier, HIGH); // Turn off humidifier
  }

  // Control heater based on temperature
  if (temperature < desiredTemperature) {
    digitalWrite(relayHeater, LOW); // Turn on heater
  } else {
    digitalWrite(relayHeater, HIGH); // Turn off heater
  }
  
  delay(1000);
}