#define BLYNK_TEMPLATE_ID "TMPL3dTeTE9zM"
#define BLYNK_TEMPLATE_NAME "Multi-Sensor Setup"
#define BLYNK_AUTH_TOKEN "ITpNHxTACH8NQXzq668EDC02A5wvDsBF"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

// Define Pins
#define TRIG_PIN 5
#define ECHO_PIN 18
#define DHTPIN 4
#define DHTTYPE DHT22
#define GAS_SENSOR_AOUT 36
#define GAS_SENSOR_DOUT 27

// WiFi Credentials
char ssid[] = "Wokwi-GUEST";      // Replace with your WiFi SSID
char pass[] = "";  // Replace with your WiFi Password

// DHT Sensor Initialization
DHT dht(DHTPIN, DHTTYPE);

// Variables
long duration, distance;

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

    // Ultrasonic Sensor Setup
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);

    // DHT Sensor Setup
    dht.begin();

    // MQ-2 Gas Sensor Setup
    pinMode(GAS_SENSOR_DOUT, INPUT);

    // Connect to Blynk
    Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

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

    // --- Ultrasonic Sensor Reading ---
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);
    duration = pulseIn(ECHO_PIN, HIGH);
    distance = (duration / 2) / 29.1; // Convert to cm
    Serial.print("Distance: ");
    Serial.print(distance);
    Serial.println(" cm");
    Blynk.virtualWrite(V1, distance); // Send distance to Virtual Pin V1

    // --- DHT22 Sensor Reading ---
    float temperature = dht.readTemperature(); // Read temperature
    float humidity = dht.readHumidity();       // Read humidity
    if (!isnan(temperature) && !isnan(humidity)) {
        Serial.print("Temperature: ");
        Serial.print(temperature);
        Serial.println(" °C");
        Serial.print("Humidity: ");
        Serial.print(humidity);
        Serial.println(" %");
        Blynk.virtualWrite(V2, temperature); // Send temperature to Virtual Pin V2
        Blynk.virtualWrite(V3, humidity);    // Send humidity to Virtual Pin V3
    } else {
        Serial.println("Failed to read from DHT sensor!");
    }

    // --- MQ-2 Gas Sensor Reading ---
    int gasLevel = analogRead(GAS_SENSOR_AOUT); // Read analog output
    int gasStatus = digitalRead(GAS_SENSOR_DOUT); // Read digital output
    Serial.print("Gas Level (Analog): ");
    Serial.println(gasLevel);
    Serial.print("Gas Detected (Digital): ");
    Serial.println(gasStatus == HIGH ? "Yes" : "No");
    Blynk.virtualWrite(V4, gasLevel); // Send analog gas level to Virtual Pin V4
    Blynk.virtualWrite(V5, gasStatus); // Send gas status (HIGH/LOW) to Virtual Pin V5

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