#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <dht.h>

dht DHT;

#define DHT22_PIN 5
#define ldr 2

Servo myservo;  // create servo object to control a servo
int pos = 0;    // variable to store the servo position
const int led = 9;

LiquidCrystal_I2C lcd(0x27, 20, 2);     // 20 columns and 2 rows

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHT22 test!"));
    
  lcd.init();
  lcd.backlight();
  myservo.attach(8);  
  pinMode(led, OUTPUT);
  pinMode(ldr, INPUT);
}

void loop() { 
  int chk = DHT.read22(DHT22_PIN);
  float temperature = DHT.temperature;
  float humidity = DHT.humidity;

  // Check if any reads failed and exit early (to try again).
  if (chk != DHTLIB_OK) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Display temperature and humidity
  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("%");

  // Move the servo based on temperature
  if (temperature > 25) {
    for (pos = 0; pos <= 180; pos += 1) {
      myservo.write(pos);  
      //lcd.print(pos);           
      delay(15);                       
    }
    for (pos = 180; pos >= 0; pos -= 1) {
      myservo.write(pos);    
      //lcd.print(pos);         
      delay(15);                       
    }
  } else {
    myservo.write(0);  // Keep servo at 0 position if temperature is <= 25
  }
  delay(2000);  // Wait a bit before refreshing the display
  lcd.clear();

  // Check LDR and control LED
  if (digitalRead(ldr) == LOW) {
    digitalWrite(led, HIGH);
    lcd.setCursor(4, 0);
    lcd.print("Light ON!");
  } else{
    digitalWrite(led, LOW);
    lcd.setCursor(4, 0);
    lcd.print("Light OFF!");
  }
  delay(2000);  // Wait a bit before repeating the loop
  lcd.clear();
}