#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Pin assignments for Arduino Mega
const int trigPin = 22;
const int echoPin = 23;
const int pirPin = 25;
const int ldrPin = A8;
const int servoPin = 26;
const int oneWireBus = 24;

// Create objects
Servo myServo;
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16x2 display
OneWire oneWire(oneWireBus);
DallasTemperature ds18b20(&oneWire);

// Variables
long duration;
int distance;
int pirState = LOW;
int ldrValue;
float temperatureC;

void setup() {
  // Initialize LCD with 16 columns and 2 rows
  lcd.begin(16, 2);
  lcd.backlight();

  // Attach the servo
  myServo.attach(servoPin);

  // Initialize DS18B20 sensor
  ds18b20.begin();

  // Pin Modes
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pirPin, INPUT);

  // Set initial servo position
  myServo.write(0);

  // Start serial communication
  Serial.begin(9600);
}

void loop() {
  // Read ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  // Read PIR sensor
  pirState = digitalRead(pirPin);

  // Read DS18B20 temperature
  ds18b20.requestTemperatures();
  temperatureC = ds18b20.getTempCByIndex(0);

  // Read LDR value
  ldrValue = analogRead(ldrPin);

  // Display data on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.print(temperatureC);
  lcd.print("C");

  lcd.setCursor(0, 1);
  lcd.print("Dist:");
  lcd.print(distance);
  lcd.print("cm");

  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("PIR:");
  lcd.print(pirState ? "Motion" : "NoMotion");

  lcd.setCursor(0, 1);
  lcd.print("LDR:");
  lcd.print(ldrValue);

  delay(2000);

  // Servo control based on temperature
  if (temperatureC > 30) {
    myServo.write(90); // Move servo to 90 degrees
  } else {
    myServo.write(0); // Move servo back to 0 degrees
  }

  delay(1000);
}