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

#define DHTPIN 2     
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE);

const int PIR_PIN = 1;  
const int LDR_PIN = A0; 
const int LED_PIN = 3;  
const int SERVO_PIN = 5; // Define the servo pin

LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myservo;  // create servo object to control a servo

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(PIR_PIN, INPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT); 
  
  lcd.init();
  lcd.backlight();
  lcd.clear();

  myservo.attach(SERVO_PIN);  // attaches the servo on SERVO_PIN to the servo object
}

void loop() {
  // Read PIR sensor
  int pirValue = digitalRead(PIR_PIN);
  // Read LDR sensor
  int ldrValue = analogRead(LDR_PIN);
  // Read DHT sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  
  // Display PIR and LDR values on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PIR: ");
  lcd.print(pirValue);
  lcd.setCursor(0, 1);
  lcd.print("LDR: ");
  lcd.print(ldrValue);
  
  // Control LED based on LDR value
  if (ldrValue > 500) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  
  // Check if the temperature is above the threshold
  if (temperature >= 30.0) {
    // Rotate servo in one direction
    for (int pos = 0; pos <= 180; pos += 1) {
      myservo.write(pos);
      delay(15);
    }
    
    // Rotate servo in the opposite direction
    for (int pos = 180; pos >= 0; pos -= 1) {
      myservo.write(pos);
      delay(15);
    }
  } else {
    // If the temperature is below 30 degrees, stop the servo
    myservo.write(90); // Stop the servo by setting it to its neutral position
  }
  
  // Display humidity and temperature on LCD
  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");
  
  delay(2000); 
}