#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN 7             
#define DHTTYPE DHT22        
#define BUZZERPIN 8          

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int MQ7_PIN = A0;
const int MQ135_PIN = A1;

void setup() {
  pinMode(BUZZERPIN, OUTPUT);  
  lcd.begin(16, 2);
  dht.begin();
}

void loop() {
  int temperature = dht.readTemperature();
  int humidity = dht.readHumidity();
  int CO2Level = analogRead(MQ7_PIN);
  int airQuality = analogRead(MQ135_PIN);

  lcd.setCursor(0, 0);
  lcd.print("Temp:");
  lcd.print(temperature);
  lcd.print("C Hum:");
  lcd.print(humidity);
  lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("CO:");
  lcd.print(CO2Level);
  lcd.print(" AQ:");
  lcd.print(airQuality);

  int simulatedCO2Level = map(analogRead(A2), 0, 1023, 0, 1023);
  int simulatedAirQuality = map(analogRead(A3), 0, 1023, 0, 1023);

  if (temperature > 40 || temperature < -10 || CO2Level > simulatedCO2Level || airQuality > simulatedAirQuality || humidity < 30 || humidity > 60) {
    tone(BUZZERPIN, 1000);
    Serial.println("Warning: Abnormal");
    delay(500);
  } else {
    noTone(BUZZERPIN); 
    Serial.println("Normal Condition");
    delay(500);
  }

  delay(1000);
}