Can you add in your library Preheating and turning OFF Auto Calibration functions ?

[MIKHANYA]

Can you add in your library Preheating and turning OFF Auto Calibration functions ?

[strange-v]

Hi @MIKHANYA,

You can turn off auto-calibration via setAutoCalibration, e.g: mhz.setAutoCalibration(false);

full example:

#include <MHZ19.h>

MHZ19 mhz(&Serial1);

void setup()
{
  Serial.begin(115200);
  Serial.println(F("Starting..."));

  Serial1.begin(9600);
  mhz.setAutoCalibration(false);
}

void loop()
{
  MHZ19_RESULT response = mhz.retrieveData();
  if (response == MHZ19_RESULT_OK)
  {
    Serial.print(F("CO2: "));
    Serial.println(mhz.getCO2());
    Serial.print(F("Temperature: "));
    Serial.println(mhz.getTemperature());
    Serial.print(F("Accuracy: "));
    Serial.println(mhz.getAccuracy());
  }
  else
  {
    Serial.print(F("Error, code: "));
    Serial.println(response);
  }

  delay(15000);
}

What is preheating? Do not remember such functionality in this sensor.

[MIKHANYA]

Thanks for the example, "Preheating" I saw this function in other libs. I don't actually know how it works there, but I think it's like a filter. When we send a request for data when the sensor just plugged in(I use mh-z19b), at first there is an error, then it sends a lower threshold of CO2 410 ppm. After a period of time, in my case 70 sec, it shows true CO2lvl. Maybe the time period when it sends 410 ppm may be different and depend on the temperature outside.

[strange-v]

Okay, I see. I understand the benefits of such functionality though, I'd like to keep the code simple and straightforward. The mentioned logic can be implemented in a different layer (in a user code) if it is required for the particular use case.