#define BLYNK_TEMPLATE_ID "TMPL3iQmLIC35"
#define BLYNK_TEMPLATE_NAME "Dht22 sensor using ESP32"
#define BLYNK_AUTH_TOKEN "1pCaKGYmFpyb0EdVrGcAd51NyVgOXv_4"

//dht sensor interface with blynk app

#include <WiFi.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include "DHT.h"

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = BLYNK_AUTH_TOKEN;
//Paste auth token you copied

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";///Enter your wifi name
char pass[] = "";// Enter wifi password

#define DHTPIN 12        // What digital pin we're connected to select yours accordingly

// Uncomment whatever type you're using!
//#define DHTTYPE DHT11     // DHT 11
#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int potPin = 34;

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void sendSensor()
{
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  // Read gas value from the potentiometer
  int gasValue = analogRead(potPin);

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V1, humidity); // select your virtual pins accordingly
  Blynk.virtualWrite(V0, temperature); // select your virtual pins accordingly
  Blynk.virtualWrite(V2, gasValue);
}


void displayMessage(String line1, String line2, int delayTime = 2000) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(line1);
  lcd.setCursor(0, 1);
  lcd.print(line2);
  delay(delayTime);
}


void setup()
{
  // Debug console

  lcd.init();
  lcd.backlight();

  Serial.begin(115200);
delay(1000);
  Blynk.begin(auth, ssid, pass);
  // You can also specify server:
  //Blynk.begin(auth, ssid, pass, "blynk-cloud.com", 80);
  //Blynk.begin(auth, ssid, pass, IPAddress(192,168,1,100), 8080);

  dht.begin();

  // Setup a function to be called every second
  timer.setInterval(1000L, sendSensor);
}

void loop()
{
  Blynk.run();
  timer.run();
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  int gasValue = analogRead(potPin);

  // Determine air level based on the specified conditions
  String airLevel;

   if ((temperature >= 22 && temperature <= 30) && (humidity > 30 && humidity < 60)) {
    airLevel = "Good";
  } else if ((temperature >= 30 && temperature <= 40) && (humidity >= 60 && humidity <= 70)) {
    airLevel = "Normal";
  } else {
    airLevel = "Bad";
  }

  // Determine gas level based on the criteria
  String gasLevel;

  if (gasValue >= 0 && gasValue <= 1364) {
    gasLevel = "Good";
  } else if (gasValue >= 1365 && gasValue <= 2730) {
    gasLevel = "Normal";
  } else {
    gasLevel = "Bad";
  }

  // Determine air quality based on the criteria
  String airQuality;

  if ((airLevel == "Good" || airLevel == "Normal") && (gasLevel == "Good" || gasLevel == "Normal")) {
    airQuality = "Good Air Quality";
  } else {
    airQuality = "Bad Air Quality";
  }

  // Display temperature and humidity on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + " C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(humidity) + " %");
  delay(2000); // Display temperature and humidity for 2 seconds

  // Display air level on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Air Level: " + airLevel);
  delay(2000); // Display air level for 2 seconds

  // Display gas level and gas value on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas Level: " + gasLevel);
  lcd.setCursor(0, 1);
  lcd.print("Gas Value: " + String(gasValue));
  delay(2000); // Display gas level and value for 2 seconds

  // Display air quality on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Air Quality: ");
  lcd.setCursor(0, 1);
  lcd.print(airQuality);
  delay(2000); // Display air quality for 2 seconds

}