#include "DHT.h"

#define MQ2_ANA A1
#define MQ2_DIG 2
#define redLed 12
#define buzzer 8

#define DHTPIN 1   
#define DHTTYPE DHT22 

DHT dht(DHTPIN, DHTTYPE);

int temp;

void setup() 
{
  Serial.begin(9600);
  pinMode(MQ2_ANA, INPUT);
  pinMode(MQ2_DIG, INPUT);
  pinMode(redLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  dht.begin();
}

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

  Serial.print("smoke/gas: ");
  int smokVal = analogRead(MQ2_ANA);
  temp = map(smokVal, 0, 1023, 0, 100);
  Serial.println(temp);
  Serial.print("Digital: ");
  Serial.println(digitalRead(MQ2_DIG));
  // noTone(buzzer);

  if ((temp > 41) && (tem > 40) && (hum < 20))
  {
   digitalWrite(redLed, HIGH); 
   tone(buzzer, 100);
  }
  else
  {
   digitalWrite(redLed, LOW); 
   noTone(buzzer);
  }
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C "));

  // Wait a few seconds between measurements.
  delay(3000);
}