Temp, Humidity CO2 sensor and library.

Using Arduino Sensors
92

in the main sketch change this

void loop()
{
  Serial.println("Loop");
  float t = czr.Celsius();
  float f = czr.Fahrenheit();
  float h = czr.Humidity();
  uint32_t c = czr.CO2();
  
  Serial.print("Celcius = ");Serial.println(t);
  Serial.print("Fahrenheit = ");Serial.println(f);
  Serial.print("Humidity = ");Serial.println(h);
  Serial.print("CO2 = ");Serial.println(c);
  
  delay(3000);
}

in cozir.h change this

uint32_t CO2();

in cozir.cpp change this

uint32_t COZIR::CO2()
{
  return Request("Z");
}

and

uint32_t COZIR::Request(const char* s)
{
  Command(s);
  // empty buffer
  buffer[0] = '\0';
  // read answer; there may be a 100ms delay!
  // TODO: PROPER TIMEOUT CODE.
  delay(200);
  int idx = 0;
  while(CZR_Serial.available())
  {
    buffer[idx++] = CZR_Serial.read();
  }
  buffer[idx] = '\0';

  uint32_t rv = 0;
  switch(buffer[0])
  {
    case 'T' :
			rv = atoi(&buffer[5]);
            if (buffer[4] == 1) rv += 1000;
			// negative values are mapped above 1000..1250 => capture this in Celsius()
			break;
	default :
			rv = atol(&buffer[2]);
			break;
  }
  return rv;
}

and change the version number to 0.1.04 if it works :slight_smile: