#include <Wire.h>
#include <LiquidCrystal.h>
#include <DHT.h>
#include <ESP32Servo.h>

#define DHTPIN 4        // GPIO pin for DHT22
#define DHTTYPE DHT22
#define LED_PIN 13       // GPIO pin for LED
#define BLUE_LED_PIN 12  // GPIO pin for blue LED
#define SERVO_PIN 14     // GPIO pin for Servo
#define BUZZER_PIN 15    // GPIO pin for Buzzer
#define SWITCH_PIN 2     // GPIO pin for switch

#define LCD_RS 5
#define LCD_EN 6
#define LCD_D4 7
#define LCD_D5 8
#define LCD_D6 9
#define LCD_D7 10

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(19, 23, 18, 17, 16, 15);
Servo servo;  // Use ESP32Servo instead of Servo

float humidity, temperature;  // Declare variables outside the if condition

void setup() {
  Serial.begin(9600);

  lcd.begin(16, 2);  // Assuming your LCD is 16x2
  lcd.print("ESP32 Project");
  delay(2000);
  lcd.clear();

  dht.begin();
  pinMode(LED_PIN, OUTPUT);
  pinMode(BLUE_LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(SWITCH_PIN, INPUT_PULLUP);
  servo.attach(SERVO_PIN);
}

void loop() {
  if (digitalRead(SWITCH_PIN) == LOW) {
    delay(2000);

    humidity = dht.readHumidity();
    temperature = dht.readTemperature();

    if (isnan(humidity) || isnan(temperature)) {
      lcd.clear();
      lcd.print("Error: Cannot read sensor data!");
      Serial.println("Error: Cannot read sensor data!");
      return;
    }

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Humidity: ");
    lcd.print(humidity);
    lcd.print("%");
    lcd.setCursor(0, 1);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print("C");

    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print("%  Temp: ");
    Serial.print(temperature);
    Serial.println("°C");

    if ((humidity < 55 || humidity > 60) || (temperature < 37.8 || temperature > 41)) {
      digitalWrite(LED_PIN, HIGH);

      if (humidity < 55 || temperature < 37.8) {
        digitalWrite(BLUE_LED_PIN, HIGH);
      } else {
        digitalWrite(BLUE_LED_PIN, LOW);
      }

      digitalWrite(BUZZER_PIN, HIGH);

      if (humidity > 60 || temperature > 41) {
        servo.write(180);
      } else {
        servo.write(90);
      }
    } else {
      digitalWrite(LED_PIN, LOW);
      digitalWrite(BLUE_LED_PIN, LOW);
      digitalWrite(BUZZER_PIN, LOW);
      servo.write(90);
    }
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BLUE_LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
    servo.write(90);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Switch is HIGH");
    lcd.setCursor(0, 1);
    lcd.print("Press the switch");
    Serial.println("");
  }
}