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

LiquidCrystal_I2C lcd(0x27, 16, 2);

#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

int chk;
int P; // Pathogen value
int A; // Air Quality


//Initialize LCD, DHT22 sensor and buzzer:
void setup(){
  lcd.init(); lcd.backlight();  dht.begin();  

  Serial.begin(9600);  
  pinMode(9, OUTPUT);  pinMode(10, OUTPUT);  pinMode(11, OUTPUT);
}

void loop(){
  delay(500);
  //Read data and store it to variables hum and temp
  P = dht.readHumidity();  A = dht.readTemperature();
  A=A+150;
  //Print temp and humidity values to serial monitor
  Serial.print("Pathogen Level: ");
  Serial.print(P);
  Serial.println(" PPM ");
  Serial.print("Air Quality: ");
  Serial.print(A);
  Serial.print("\n");

  

  if(P >= 50.00 && A >= 300.00){
    digitalWrite(9, HIGH);  digitalWrite(10, LOW);  digitalWrite(11, LOW);
   
    lcd.println(" Critical Air Quality ");
    lcd.setCursor(0, 1);
    lcd.println("High Pathogen Level ");
    lcd.setCursor(0, 0);

  
   
 
  }else{

    digitalWrite(9, LOW);  digitalWrite(10, LOW);  digitalWrite(11, HIGH);
     lcd.println("Air Quality "+String(A));
    lcd.setCursor(0, 1);
    lcd.println("Pathogen "+String(P));
    lcd.setCursor(0, 0);

  
  }
  

  if(P < 25.00 && A >= 225.00){
    digitalWrite(9, LOW);  digitalWrite(10, HIGH);  digitalWrite(11, LOW);
    lcd.println("Critical Air Quality");  lcd.setCursor(0, 1);
    lcd.println("Mediun Pathogen Level");  lcd.setCursor(0, 0);
 
  }
  if(P >= 70.00 ){
    digitalWrite(9, HIGH);  digitalWrite(10, LOW);  digitalWrite(11, LOW);
    lcd.println("High Pathogen Level");  lcd.setCursor(0, 1);
    
    
  }
   if(A >= 300.00 ){
    digitalWrite(9, HIGH);  digitalWrite(10, LOW);  digitalWrite(11, LOW);
     lcd.println("Hazardous Air Quality");  lcd.setCursor(0, 1);
    
  }
  if(A >= 200.00 ){
    digitalWrite(9, HIGH);  digitalWrite(10, LOW);  digitalWrite(11, LOW);
     lcd.println("Very Unhealthy Air Quality");  lcd.setCursor(0, 1);
    
  }
  if(A >= 150.00 ){
    digitalWrite(9, LOW);  digitalWrite(10, HIGH);  digitalWrite(11, LOW);
     lcd.println("Unhealthy Air Quality");  lcd.setCursor(0, 1);
    
  }
 
  


}