#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>
#include <WiFi.h>

// WiFi credentials
const char* ssid = "Wokwi-GUEST";         // Replace with your WiFi SSID
const char* password = ""; // Replace with your WiFi password

// Pin configuration
#define RELAY_PIN 4          // Relay connected to digital pin 4
#define LED_PIN 2            // LED pin
#define BUZZER_PIN 17        // Buzzer pin
#define DHT_PIN 5            // DHT sensor pin
#define SERVO_PIN 16         // Servo motor pin
#define TRIG_PIN 19          // Ultrasonic TRIG pin
#define ECHO_PIN 18          // Ultrasonic ECHO pin

// Constants
#define TEMP_THRESHOLD 30          // Temperature threshold to activate AC/fan
#define TEMP_HIGH_THRESHOLD 78     // High temperature threshold to activate buzzer
#define DISTANCE_THRESHOLD 5       // Distance threshold in cm to move servo
#define BUZZER_FREQUENCY 1000      // Frequency for buzzer tone

DHT dht(DHT_PIN, DHT22);
Servo servoMotor;
LiquidCrystal_I2C lcd(0x27, 20, 4); // LCD I2C address and size

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

  // Initialize I2C communication for the LCD on GPIO 23 (SDA) and GPIO 22 (SCL)
  Wire.begin(23, 22);
  lcd.begin(20, 4);
  lcd.init();
  lcd.backlight();

  // Initialize other components
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  dht.begin();
  servoMotor.attach(SERVO_PIN);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi!");
}

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

  // Display temperature and humidity on LCD
  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("%");

  // Control LED and relay based on temperature for AC/Fan
  if (temperature >= 30, humidity <= 10) {
    digitalWrite(LED_PIN, HIGH); // Turn on fan LED
    lcd.setCursor(0, 2);
    lcd.print("AC/Kipas Menyala   "); // Clear previous message
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn off fan LED
    lcd.setCursor(0, 2);
    lcd.print("AC/Kipas Mati      "); // Clear previous message
  }

  // Control buzzer based on high temperature
  if (temperature >= 78) {
    digitalWrite(BUZZER_PIN, HIGH);  // Activate buzzer
    tone(BUZZER_PIN, BUZZER_FREQUENCY); // Play sound on buzzer
    lcd.setCursor(0, 3);
    lcd.print("Bahaya Kebakaran!   "); // Clear previous message
  } else {
    digitalWrite(BUZZER_PIN, LOW);   // Deactivate buzzer
    noTone(BUZZER_PIN); // Stop sound on buzzer
    lcd.setCursor(0, 3);
    lcd.print("                   "); // Clear previous message
  }

  // Control servo based on distance
  if (distance <= 10) {
    servoMotor.write(90);            // Move servo to 90 degrees
  } else {
    servoMotor.write(0);             // Return servo to 0 degrees
  }

  delay(1000);  // Delay for readability
}

// Function to get distance from ultrasonic sensor
float getDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  float duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;  // Calculate distance in cm
  return distance;
}