#define BLYNK_TEMPLATE_ID "TMPL6my5gtzC1"
#define BLYNK_TEMPLATE_NAME "Smart Home with ESP32"

#include "DHT.h"
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#define DHTPIN 4
#define DHTTYPE DHT11
DHT dht(DHTPIN,DHTTYPE);

char auth[] = "imwTT55dqg0cmLuRWCzHAym1Der8xf8e";  // Your Blynk authentication token
char ssid[] = "CLASS ROOM"; // Your WiFi SSID
char pass[] = "ADB@2021$";    // Your WiFi password

#define RELAY_1_PIN 23  // Relay 1 control pin
#define RELAY_2_PIN 22  // Relay 2 control pin
#define RELAY_3_PIN 21  // Relay 3 control pin
#define RELAY_4_PIN 19  // Relay 4 control pin

#define TEMPERATURE_VIRTUAL_PIN V4  // Blynk virtual pin for temperature
#define HUMIDITY_VIRTUAL_PIN V5     // Blynk virtual pin for humidity

BlynkTimer timer;

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

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Blynk.virtualWrite(TEMPERATURE_VIRTUAL_PIN, temperature);  // Send temperature data to Blynk
  Blynk.virtualWrite(HUMIDITY_VIRTUAL_PIN, humidity);        // Send humidity data to Blynk
  Serial.println(temperature);
  Serial.println(humidity);
}

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

  dht.begin();

  Blynk.begin(auth, ssid, pass);  // Connect to Blynk server

  pinMode(RELAY_1_PIN, OUTPUT);
  pinMode(RELAY_2_PIN, OUTPUT);
  pinMode(RELAY_3_PIN, OUTPUT);
  pinMode(RELAY_4_PIN, OUTPUT);

  timer.setInterval(1000L, sendSensorData);  // Send sensor data every 1 second
}

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

BLYNK_WRITE(V0) {  // Blynk button widget for Relay 1
  int state = param.asInt();
  digitalWrite(RELAY_1_PIN, state);
}

BLYNK_WRITE(V1) {  // Blynk button widget for Relay 2
  int state = param.asInt();
  digitalWrite(RELAY_2_PIN, state);
}

BLYNK_WRITE(V2) {  // Blynk button widget for Relay 3
  int state = param.asInt();
  digitalWrite(RELAY_3_PIN, state);
}

BLYNK_WRITE(V3) {  // Blynk button widget for Relay 4
  int state = param.asInt();
  digitalWrite(RELAY_4_PIN, state);
}