#define BLYNK_TEMPLATE_ID "TMPL6kWN92xgM"
#define BLYNK_TEMPLATE_NAME "Automated Air purifier"
#define BLYNK_AUTH_TOKEN "29-TfEOHXuD37x_ERtbiYVxHfZMiodqj"

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


#define DHTPIN 2  
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int potPin = 34;
const int ledPin = 4;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;

void sendData() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  int gasValue = analogRead(potPin);
  Blynk.virtualWrite(V1, temperature);
  Blynk.virtualWrite(V2, humidity);
  Blynk.virtualWrite(V3, 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() {
  lcd.init();
  lcd.backlight();
  dht.begin();
  pinMode(ledPin, OUTPUT);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
  }
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  Blynk.virtualWrite(V1, 0); 
  Blynk.virtualWrite(V2, 0); 
  Blynk.virtualWrite(V3, 0);
  timer.setInterval(3000L, sendData);
}

void loop() {
  Blynk.run();
  timer.run();
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int gasValue = analogRead(potPin);
  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";
  }

  String gasLevel;

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

  String airQuality;

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

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + " C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(humidity) + " %");
  delay(2000); 
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Air Level: " + airLevel);
  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas Level: " + gasLevel);
  lcd.setCursor(0, 1);
  lcd.print("Gas Value: " + String(gasValue));
  delay(2000);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Air Quality: ");
  lcd.setCursor(0, 1);
  lcd.print(airQuality);
  delay(2000);   

  if (airQuality == "Bad Air Quality") {
    digitalWrite(ledPin, HIGH); 
  } else {
    digitalWrite(ledPin, LOW);
  }
}