#include <Wire.h>
#include <RTClib.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>   // For ESP32 Servo library
#include <DHT.h>
#include <OneWire.h>

// Pin Definitions
#define DHTPIN 14         // Pin for DHT22
#define DHTTYPE DHT22     // DHT 22 sensor type
#define DS18B20_PIN 32    // Pin for DS18B20 Temperature Sensor
#define PIR_PIN 25        // Pin for PIR Sensor
#define RELAY_PIN 27      // Pin for Relay
#define LDR_PIN 34        // Pin for LDR Sensor (Analog)
#define TRIG_PIN 13       // Pin for Ultrasonic Sensor (Trig)
#define ECHO_PIN 12       // Pin for Ultrasonic Sensor (Echo)
#define SERVO_PIN 16      // Pin for Servo Motor

// Objects for components
RTC_DS1307 rtc;
DHT dht(DHTPIN, DHTTYPE);
Servo myServo;           // ESP32Servo object for controlling the servo motor
LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD I2C address: 0x27

// OneWire for DS18B20
OneWire oneWire(DS18B20_PIN);

void setup() {
  Serial.begin(115200);

  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();

  // Initialize DHT22
  dht.begin();

  // Initialize RTC
  if (!rtc.begin()) {
    lcd.setCursor(0, 0);
    lcd.print("Couldn't find RTC");
    while (1);
  }

  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Initialize Pins
  pinMode(PIR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LDR_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Initialize Servo with ESP32Servo
  myServo.attach(SERVO_PIN);

  // Initial state
  digitalWrite(RELAY_PIN, LOW);

  lcd.setCursor(0, 0);
  lcd.print("Smart home automation");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("DHT Err");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println("°C");
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.println("%");

    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print("C");

    lcd.setCursor(0, 1);
    lcd.print("Hum: ");
    lcd.print(humidity);
    lcd.print("%");
  }

  // Read temperature from DS18B20 using OneWire
  oneWire.reset();
  oneWire.write(0x44); // Start temperature conversion
  delay(1000);         // Wait for conversion to complete
  oneWire.reset();
  oneWire.write(0xBE); // Read temperature command

  byte data[9];
  for (int i = 0; i < 9; i++) {
    data[i] = oneWire.read();
  }

  int16_t rawTemp = (data[1] << 8) | data[0];
  float ds18b20Temperature = (float)rawTemp / 16.0;

  Serial.print("DS18B20 Temp: ");
  Serial.print(ds18b20Temperature);
  Serial.println("°C");

  lcd.setCursor(0, 0);
  lcd.print("DS18B20: ");
  lcd.print(ds18b20Temperature);
  lcd.print(" C");
  
  delay(2000);
  lcd.clear();

  // PIR Sensor for Motion Detection
  int pirState = digitalRead(PIR_PIN);
  if (pirState == HIGH) {
    Serial.println("Motion Detected!");
    digitalWrite(RELAY_PIN, HIGH);  // Turn on relay (e.g., appliance)
    lcd.setCursor(0, 0);
    lcd.print("Motion Detected");
  } else {
    digitalWrite(RELAY_PIN, LOW);   // Turn off relay
    lcd.setCursor(0, 0);
    lcd.print("No Motion");
  }

  delay(2000);
  lcd.clear();

  // Ultrasonic Sensor Reading
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2;

  if (distance < 10) {
    Serial.println("Object Detected by Ultrasonic");
    myServo.write(90);  // Move servo to 90 degrees (open)
    lcd.setCursor(0, 0);
    lcd.print("Obj Detected:");
    lcd.print(distance);
    lcd.print("cm");
  } else {
    myServo.write(0);   // Move servo to 0 degrees (close)
    lcd.setCursor(0, 0);
    lcd.print("No Object:");
    lcd.print(distance);
    lcd.print("cm");
  }

  delay(2000);
  lcd.clear();

  // LDR Sensor Reading
  int ldrValue = analogRead(LDR_PIN);
  if (ldrValue < 1000) { // Adjust threshold for light levels
    Serial.println("Low Light Detected!");
    digitalWrite(RELAY_PIN, HIGH);  // Turn on relay if it's dark
    lcd.setCursor(0, 0);
    lcd.print("Low Light");
  } else {
    digitalWrite(RELAY_PIN, LOW);   // Turn off relay
    lcd.setCursor(0, 0);
    lcd.print("Light OK");
  }

  delay(2000);
  lcd.clear();

  // Time from RTC
  DateTime now = rtc.now();
  Serial.print("Current time: ");
  Serial.print(now.hour());
  Serial.print(":");
  Serial.print(now.minute());
  Serial.print(":");
  Serial.println(now.second());

  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(now.hour());
  lcd.print(":");
  lcd.print(now.minute());
  lcd.print(":");
  lcd.print(now.second());
  
  delay(2000);
  lcd.clear();
}