#define BLYNK_TEMPLATE_ID "TMPL6gRJ4SMbv"
#define BLYNK_TEMPLATE_NAME "Air Mmonitoring System with IoT"
#define BLYNK_AUTH_TOKEN "E54w7MET_qRX-jwEyfoVeCQQ_euNRahV"

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

#include <DHT.h>
 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

byte degree_symbol[8] = 
{
  0b00111,
  0b00101,
  0b00111,
  0b00000,
  0b00000,
  0b00000,
  0b00000,
  0b00000
};

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "Wokwi-GUEST";  // type your WiFi name
char pass[] = "";  // type your WiFi password

BlynkTimer timer;

int gas = 32;
int sensorThreshold = 100;

#define DHTPIN 2 // Connect Out pin to D2 in NODE MCU
#define DHTTYPE DHT11  
DHT dht(DHTPIN, DHTTYPE);

void sendSensor()
{
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  int gasValue = analogRead(gas);
  Blynk.virtualWrite(V2, gasValue);  // Send gas value to Blynk
  Serial.print("Gas Value: ");
  Serial.println(gasValue);

  Blynk.virtualWrite(V0, t);
  Blynk.virtualWrite(V1, h);
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print("    Humidity: ");
  Serial.println(h);
}

void setup()
{   
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  dht.begin();
  timer.setInterval(30000L, sendSensor);
  lcd.begin(16, 2);
  lcd.setCursor(3, 0);
  lcd.print("Air Quality");
  lcd.setCursor(3, 1);
  lcd.print("Monitoring");
  delay(2000);
  lcd.clear();
}

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

}