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

#define DHTPIN 6
#define DHTTYPE DHT22
#define TRIGGER_PIN 2   
#define ECHO_PIN 3 
#define LED_PIN 8 
#define SERVO_PIN 10 
#define RELAY_PIN 12

DHT dht(DHTPIN, DHTTYPE);
Servo myServo;

LiquidCrystal_I2C lcd(0x27, 24, 3);  

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT); 
  myServo.attach(SERVO_PIN); 
  pinMode(RELAY_PIN, OUTPUT);
  lcd.init();
  lcd.backlight();
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  long duration, distance;
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = (duration / 2) / 29.1;

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
  lcd.setCursor(0, 0);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" C");
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C");

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  lcd.setCursor(0, 2);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");


  if (temperature < 28) {
    digitalWrite(LED_PIN, HIGH); 
  } else {
    digitalWrite(LED_PIN, LOW); 
  }

  if (humidity < 60 && distance > 100) {
    digitalWrite(RELAY_PIN, HIGH); 
    delay(500); 
    digitalWrite(RELAY_PIN, LOW); 
    delay(500); 
    myServo.write(90); 
    delay(500); 
    myServo.write(0); 
    delay(500); 
    myServo.write(180); 
    delay(500); 
  }
  delay(1000);
}