#define BLYNK_TEMPLATE_NAME "IoT"
#define BLYNK_TEMPLATE_ID "TMPL6n9dQ8Jp-"
#define BLYNK_AUTH_TOKEN "rPjBOvhd2gZEF65KT2he9jhhetQZUeZf"

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

// DHT22 settings
#define DHTPIN 23    // DHT22 Data pin connected to GPIO 23 on ESP32
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

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

// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Pin settings
#define PUMP_LED_PIN 13  // LED mô phỏng máy bơm nối với chân GPIO 13

BlynkTimer timer;

// Global variables to store previous sensor values
float lastTemperature = -100.0;
float lastHumidity = -100.0;
bool isPumpOn = false; // Track pump status

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

    // Check if the readings are valid
    if (isnan(temperature) || isnan(humidity)) {
        Serial.println(F("Failed to read from DHT sensor!"));
        return;
    }

    // Update Blynk only if values have changed
    if (temperature != lastTemperature) {
        Blynk.virtualWrite(V0, temperature); // Send temperature to Virtual Pin V0
        lastTemperature = temperature;
    }
    if (humidity != lastHumidity) {
        Blynk.virtualWrite(V1, humidity);    // Send humidity to Virtual Pin V1
        lastHumidity = humidity;
    }

    // Display only if the value changes
    if (temperature != lastTemperature || humidity != lastHumidity) {
        // Display temperature and humidity on LCD
        lcd.setCursor(6, 0); 
        lcd.print("    ");   
        lcd.setCursor(6, 0); 
        lcd.print(temperature, 1); 
        lcd.print(" C");

        lcd.setCursor(6, 1); 
        lcd.print("    ");   
        lcd.setCursor(6, 1); 
        lcd.print(humidity, 1); 
        lcd.print(" %");
    }

    // 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"));

    // Control the pump based on humidity, using LED to simulate the pump
    if (humidity < 50.0 && !isPumpOn) {
        digitalWrite(PUMP_LED_PIN, HIGH);  // Bật LED mô phỏng máy bơm
        isPumpOn = true;
        Blynk.virtualWrite(V2, 1);  // Gửi giá trị 1 đến Blynk khi máy bơm bật
        Serial.println("Máy bơm (LED) đang bật");
    } else if (humidity >= 50.0 && isPumpOn) {
        digitalWrite(PUMP_LED_PIN, LOW);   // Tắt LED mô phỏng máy bơm
        isPumpOn = false;
        Blynk.virtualWrite(V2, 0);  // Gửi giá trị 0 đến Blynk khi máy bơm tắt
        Serial.println("Máy bơm (LED) đang tắt");
    }
}

void setup()
{
    // Initialize serial, sensors, and LCD
    Serial.begin(115200);
    dht.begin();

    lcd.init();
    lcd.backlight();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.setCursor(0, 1);
    lcd.print("Humi: ");

    // Initialize Wi-Fi and Blynk
    Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

    // Set up pump LED pin (to simulate pump activity)
    pinMode(PUMP_LED_PIN, OUTPUT);
    digitalWrite(PUMP_LED_PIN, LOW); // Ensure pump (LED) is off at start

    // Set timer to send data to Blynk every 2 seconds
    timer.setInterval(2000L, sendSensorData);
}

void loop()
{
    Blynk.run();
    timer.run();
}