#define BLYNK_TEMPLATE_ID "[email protected]"
#define BLYNK_TEMPLATE_NAME "ESP32 by joranin"
#define BLYNK_AUTH_TOKEN "-AgK8xrgV491fWcnFySBnh35Bs-GXVPx" // แทนที่ด้วย Blynk Auth Token ของคุณ

#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define DHTPIN 23       // DHT22 Data pin connected to GPIO 23 on ESP32
#define DHTTYPE DHT22   // DHT22 sensor
#define LED_PIN 12     // LED connected to GPIO 12
#define BUTTON_PIN 14  // Button connected to GPIO 14

// Blynk authorization token
char auth[] = "-AgK8xrgV491fWcnFySBnh35Bs-GXVPx"; // Replace with your Blynk auth token
char ssid[] = "TONG2.0";              // Your WiFi SSID
char pass[] = "14122546";           // Your WiFi Password

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16x2 display

void setup() {
  Serial.begin(115200);
  Serial.println(F("DHT22 with ESP32!"));

  lcd.init();         // Initialize the LCD
  lcd.backlight();    // Turn on the LCD backlight
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");  // Fixed label for temperature
  lcd.setCursor(0, 1);
  lcd.print("Humi: ");  // Fixed label for humidity
  
  dht.begin();        // Initialize the DHT22 sensor

  pinMode(LED_PIN, OUTPUT);       // Set the LED pin as output
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Set the button pin with an internal pull-up resistor

  // Connect to WiFi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(F("."));
  }
  Serial.println(F("Connected to WiFi"));

  // Start Blynk
  Blynk.begin(auth, ssid, pass);
}

void loop() {
  Blynk.run(); // Run Blynk

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

  // If reading fails, display an error
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Display temperature and humidity on LCD
  lcd.setCursor(6, 0);         // Move cursor to the temperature display area
  lcd.print("    ");           // Clear previous temperature value
  lcd.setCursor(6, 0);         // Move cursor back
  lcd.print(temperature, 1);   // Print temperature with 1 decimal place
  lcd.print(" C");             // Append " C"

  lcd.setCursor(6, 1);         // Move cursor to humidity display area
  lcd.print("    ");           // Clear previous humidity value
  lcd.setCursor(6, 1);         // Move cursor back to the correct position
  lcd.print(humidity, 1);      // Print humidity with 1 decimal place
  lcd.print(" %");             // Append " %"

  // Print to Serial Monitor (optional for debugging)
  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C"));

  // Send data to Blynk
  Blynk.virtualWrite(V0, temperature); // Send temperature to virtual pin V0
  Blynk.virtualWrite(V1, humidity);    // Send humidity to virtual pin V1

  // LED control based on button state
  if (digitalRead(BUTTON_PIN) == LOW) {  // Button pressed
    digitalWrite(LED_PIN, HIGH);         // Turn LED ON
    Blynk.virtualWrite(V2, 1);           // Send LED ON state to Blynk (V2)
  } else {                                // Button released
    digitalWrite(LED_PIN, LOW);          // Turn LED OFF
    Blynk.virtualWrite(V2, 0);           // Send LED OFF state to Blynk (V2)
  }

  delay(2000);  // Wait 2 seconds before reading sensor again
}