#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT22
#define MQ135_PIN A0

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
  Serial.println("Air Quality Monitoring System");
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int gasValue = analogRead(MQ135_PIN); // Simulated gas reading

  Serial.print("Temp: ");
  Serial.print(temperature);
  Serial.print("°C  |  Humidity: ");
  Serial.print(humidity);
  Serial.print("%  |  Air Quality (Raw): ");
  Serial.println(gasValue);

  delay(2000); // 2-second delay between readings
}