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

#define DHTPIN 2
#define DHTTYPE DHT22
#define LDR_PIN A0
#define SERVO_PIN 9
#define BUZZER_PIN 10

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myServo;

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

  dht.begin();

  lcd.init();
  lcd.backlight();

  myServo.attach(SERVO_PIN);

  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("System Initializing");
  delay(2000);
  
  lcd.clear();
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int ldrValue = analogRead(LDR_PIN);

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("DHT Error");
    delay(2000);
    return;
  }

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

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

  lcd.setCursor(0,1);
  lcd.print("Light:");
  lcd.print(ldrValue);

  if (temperature > 25.0) {
    myServo.write(90);
  } else {
    myServo.write(0);
  }

  if (humidity > 70) {
    digitalWrite(BUZZER_PIN, HIGH);
    delay(500);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(2000);
}