Gravity SCD41 CO2 sensor, ASC on or off by default?
brooksdr 2024-12-31 00:14:33 303 Views2 Replies RE: Gravity SCD41 CO2 sensor, SEN0536
The Sensirion software library for this device assumes that the auto self calibration (ASC) feature is “on” by default. In your sample code, these lines:
// SCD4X.setAutoCalibMode(true);
/**
* @brief get automatic self calibration enabled
* @return Automatic self-calibration mode:
* @n true : enable automatic self-calibration
* @n false : disable automatic self-calibration
* @note When executing the command, the sensor can't be in period measurement mode
*/
// if(SCD4X.getAutoCalibMode()) {
// Serial.println("Automatic calibration on!");
// } else {
// Serial.println("Automatic calibration off!");
// }
might imply that ASC is “off” by default in your library. Is this true? Or do these commented-out lines mean that ASC is on by default and you don't have to do anything about it in code? Is there any reason NOT to have ASC on??
Thank you for help with these questions!
The SCD4X.setAutoCalibMode(true); line explicitly enables automatic self-calibration (ASC). If this line is not included in your code, ASC’s status will depend on the default configuration of the sensor and the library. If your sensor operates in typical environments (e.g., office spaces, homes, or outdoor settings with periodic ventilation), ASC is highly beneficial and should remain enabled for long-term accuracy.
For cross-checking your data you can use another Co2 sensor like the MQ135.
https://www.theengineeringprojects.com/2024/03/mq135-air-quality-sensor.html
lia.ifat 
