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


DHT dht(2, DHT22);
float BETA = 3950;

const int irPin = 4;
const int ledPin = 12;
const int pirPin = 8;
const int relayPin1 = 7;
const int relayPin2 = 5;
const int relayPin3 = 6;
const int relayPin4 = 3;


LiquidCrystal_I2C lcd(0x27, 20, 4);
Servo servoMotor;

void setup() {
  dht.begin();
  Serial.begin(9600);
  lcd.begin(20, 4);
  lcd.backlight();  
  servoMotor.attach(A2); 
  pinMode(ledPin, OUTPUT);
  pinMode(irPin, INPUT);
  pinMode(relayPin1, OUTPUT);
  pinMode(pirPin, INPUT);
  pinMode(relayPin2, OUTPUT);
  pinMode(relayPin3, OUTPUT);
  pinMode(relayPin4, OUTPUT);
}

void loop() {

  lcd.clear();

  double humidity = dht.readHumidity();
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");

  if (humidity > 40) {
    digitalWrite(relayPin2 , HIGH);
    lcd.setCursor(0, 0);
    lcd.print("It's too wet.");
    servoMotor.write(0);

  } else if (humidity < 40) {
    digitalWrite(relayPin2 , LOW);
    lcd.setCursor(0, 0);
    lcd.print("It's dry and good.");
    servoMotor.write(90);
  }

  int analogValue1 = analogRead(A0);
  float celsius1 = 1 / (log(1 / (1023.0 / analogValue1 - 1)) / BETA + 1.0 / 298.15) - 273.15;
  int analogValue2 = analogRead(A1);
  float celsius2 = 1 / (log(1 / (1023.0 / analogValue2 - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature outside: ");
  Serial.print(celsius1);
  Serial.println(" C");
  Serial.print("Temperature inside: ");
  Serial.print(celsius2);
  Serial.println(" C");


  if (celsius1 <= celsius2) {
    lcd.setCursor(0, 1);
    lcd.print("Too hot inside");
    digitalWrite(relayPin3, HIGH);
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Weather fine now");
    digitalWrite(relayPin3, LOW);
  }

  int irValue = digitalRead(irPin);
  Serial.print("IR sensor Value: ");
  Serial.println(irValue);

  if (irValue == HIGH) {
    digitalWrite(ledPin, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("Fire detected!");
    digitalWrite(relayPin4, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
    digitalWrite(relayPin4, LOW);
    lcd.setCursor(0, 2);
    lcd.print("No Fire detected");
  }

  int pirState = digitalRead(pirPin);
  Serial.print("PIR sensor Value: ");
  Serial.println(pirState);
  if (pirState == HIGH) {
    lcd.setCursor(0, 3);
    lcd.print("Motion detected!");
    digitalWrite(relayPin1, HIGH); 
  } else {
    digitalWrite(relayPin1, LOW); 
    lcd.setCursor(0, 3);
    lcd.print("No Motion detected");
  }

  delay(500);
}