#include <Arduino.h>
#include "DHT.h"
#include "MHZCO2.h"


#define DHTPIN 2   
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE);

MHZ19B MHZ19B;

int getRandom(int lower, int upper) { 
  return (rand() % (upper - lower + 1)) + lower;  
} 
 

void setup() {
  Serial.begin(9600); 
  Serial1.begin(9600);
  dht.begin();
  MHZ19B.begin(&Serial1);
  Serial.println(F("Starting ..."));
}

void loop() {
  delay(2000);

  MHZ19B.measure();

  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  float co2 = 500 + getRandom(1, 10) / 10;
  float s02 = 10 + getRandom(1, 10) / 10;

  Serial.print(F(" CO2 (in ppm): ")); 
  Serial.print(co2);

  Serial.print(F(" SO2 (in ppm): ")); 
  Serial.print(s02);

  if (isnan(h) || isnan(t) || isnan(f) || isnan(co2) || isnan(s02)) {
    Serial.println(F(" Failed to read from DHT sensor!"));
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F(" Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
}