#define BLYNK_TEMPLATE_ID "TMPL3JQ_Drv1n"
#define BLYNK_TEMPLATE_NAME "BASIC EV MONITORING OPERATION AND TESTING SYSTEM"
#define BLYNK_AUTH_TOKEN "68m6WC1b_qdNWvpXLnrkGSlLJEIoeljv"
#include<WiFi.h>
#include<Blynk.h>
//LCD I2C library:
#include <LiquidCrystal_I2C.h>
//DHT22 sensor library:
#include <DHT.h>;
char ssid[] = "Wokwi-GUEST";

char pass[] = "";

char auth[] = "68m6WC1b_qdNWvpXLnrkGSlLJEIoeljv";
//LCD I2C address 0x27, 16 column and 2 rows!
LiquidCrystal_I2C lcd(0x27, 16, 2);

//Constants:
#define DHTPIN 2          //what pin we're connected to
#define DHTTYPE DHT22     //DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //Initialize DHT sensor for normal 16mhz Arduino
//Variables:
float H; //Humidity value
float T; //Temperature value
int buzzer = 12;

//Initialize LCD, DHT22 sensor and buzzer:
void setup(){
  lcd.init(); 
  lcd.backlight();  
  dht.begin();  
  pinMode(buzzer, OUTPUT);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to Wi-Fi");
      Serial.print(".");  //Print some text in Serial Monitor

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    }
  Serial.println("Connected to Wi-Fi");

  // Initialize Blynk
  Blynk.begin(auth, ssid, password);
}
  Serial.begin(9600);  
  Serial.println("DHT22 sensor with Arduino Uno R3!");
  pinMode(10, OUTPUT);  
  pinMode(9, OUTPUT); 
}

void loop(){
  Blynk.run();
  int value=random(0,101);
  Blynk.virtualWrite(v3,value);
  delay(2000);
  //Read data and store it to variables hum and temp
  H = dht.readHumidity(); 
  T = dht.readTemperature();
  
  //Print temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(H);
  Serial.println(" %; ");
  Serial.print("Temperature: ");
  Serial.print(T);
  Serial.println(" Celsius.\n");
  
  /*If humidity is higher than 70% & 
  temperature is higher than 30 degrees Celsius 
  then it will show on LCD „Too warm! Cool down!”*/
  if(H >= 70.00 && T >= 30.00)
  {
    digitalWrite(9, HIGH);  
    digitalWrite(10, HIGH); 
   
    lcd.println("   Too warm!    ");
    lcd.setCursor(0, 1);
    lcd.println("   Cool down!   ");
    lcd.setCursor(0, 0);
   
    digitalWrite(buzzer, 1); 
    tone(buzzer, 900, 100);
    delay(400);
    digitalWrite(buzzer, 0); 
    tone(buzzer, 900, 100);
    delay(400);
    digitalWrite(buzzer, 1); 
    tone(buzzer, 900, 100);
    delay(400);
    digitalWrite(buzzer, 0); 
    tone(buzzer, 900, 100);
    delay(400);
  }
  else
  {
  /*If humidity is lower than 70% & 
  temperature is lower than 30 degrees Celsius 
  then it will show on LCD „Temp. & hum. are in normal limits”*/
    digitalWrite(9, LOW); 
     digitalWrite(10, LOW); 
      digitalWrite(11, HIGH);
    lcd.println("Temp. & hum. are");  
    lcd.setCursor(0, 1);
    lcd.println("in normal limits");  
    lcd.setCursor(0, 0);
    digitalWrite(buzzer, 0);
  }
  
  /*If either humidity is lower than 70%, but 
  temperature is higher than 30 degrees Celsius, 
  then it will show on LCD „Be ware! Temp. too high” or
  humidity is higher than 70%, but 
  temperature is lower than 30 degrees Celsius, then
  it will show on LCD „Be ware! Hum. too high”*/
  if(H < 70.00 && T >= 30.00){
    digitalWrite(9, LOW);
    digitalWrite(10, HIGH); 
    lcd.println("Be ware!        ");
    lcd.setCursor(0, 1);
    lcd.println("Temp. too high! ");  
    lcd.setCursor(0, 0);
    digitalWrite(buzzer, 1); 
    tone(buzzer, 400, 400);  
    delay(400);
    digitalWrite(buzzer, 0); 
    tone(buzzer, 400, 400);  
    delay(400);
  }
  if(H >= 70.00 && T < 30.00){
    digitalWrite(9, HIGH);  
    digitalWrite(10, LOW);  
    lcd.println("Be ware!        ");  
    lcd.setCursor(0, 1);
    lcd.println("Hum. too high!  ");  
    lcd.setCursor(0, 0);
    digitalWrite(buzzer, 1); 
    tone(buzzer, 400, 400);  
    delay(400);
    digitalWrite(buzzer, 0); 
    tone(buzzer, 400, 400);  
    delay(400);
  }
}