MQ Gas Sensors – Debugging help example

You might want to check the raw voltage, method constants, the Rs/Ro ratio, and more. This can be achieved by using the serialDebug() function of the library. When you have initialized the sensor (either Qwiic or Native), you can read the sensor measurements in the loop() function:

void loop()
{
  mq131.update();      // Update data; read voltage level from sensor
  mq131.readSensor();
  /*
  Prints all values from and about the sensor, used for calibration and debugging purposes. The format is:
  |ADC_In | Equation_V_ADC | Voltage_ADC | Equation_RS  | Resistance_RS | EQ_Ratio | Ratio (RS/R0) | Equation_PPM | PPM |
  */
  mq131.serialDebug(); 
  delay(500);        // Sampling frequency
}

Debug print on serial monitor

mq131.serialDebug()

Prints all values from and about the sensor, used for calibration and debugging purposes

Returns value: None

Full example

See the full example below:

Debug-Print-Qwiic.ino

Debug print function example for Qwiic MQ sensors

Also check out the Native version of the example:

Debug-Print.ino

Debug print function example for Native MQ sensors

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While this example covers the MQ131, the process is practically identical for every sensor. We encourage you to check out all the examples here