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

// Pins
#define DHTPIN 2
#define DHTTYPE DHT22
#define SERVO_PIN 9

// Initialize components
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo ventServo;

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

  // Booting Sequence
  lcd.setCursor(0, 0);
  lcd.print("GREENHOUSE CTRL");
  lcd.setCursor(0, 1);
  lcd.print("Booting Up... ");
  ventServo.write(0); // Close window on start
  delay(2000);
  lcd.clear();
}

void loop() {
  // 1. Read Climate Data
  float humidity = dht.readHumidity();
  float tempC = dht.readTemperature();

  // Check if sensor reading failed
  if (isnan(humidity) || isnan(tempC)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!   ");
    return;
  }

  // 2. Display on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(tempC, 1); // 1 decimal point
  lcd.print((char)223); // Degree symbol
  lcd.print("C  ");

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

  // 3. Climate Logic (Actuation)
  // If Temp > 30C, open the roof vent window!
  if (tempC > 30.0) {
    ventServo.write(90); // Open Window
    lcd.setCursor(12, 0);
    lcd.print("[OPN]");
  } else {
    ventServo.write(0);  // Close Window
    lcd.setCursor(12, 0);
    lcd.print("[CLS]");
  }

  delay(1000); // Check environment every 1 second
}