Bme688 iaq calibration problem

[ilcnet]

Hello BSTRobin
i have 2 Bme688 sensor, that i calibrated them in clear air first time and those working well, one of them was turned off for a few days and today i turned on it but the sensor gives a false iaq value and its start from 300, but other sensor iaq value start from 20, how i can solve this problem its needed to erase eeprom?or its needed to be calibration again with which codes?
Thanks

[BSTRobin]

Hi ilcnet，

You can download BSEC 2.x Software from https://www.bosch-sensortec.com/software-tools/software/bme688-software/
You can refer integration guide and "BSEC_2.0.6.1_Generic_Release_04302021\examples\bsec2\examples\basic_config_state" example code.
bool saveState(Bsec& bsec)
{
uint8_t bsecState[BSEC_MAX_STATE_BLOB_SIZE];

if (!bsec.getState(bsecState))
return false;

Serial.println("Writing state to EEPROM");

for (uint8_t i = 0; i < BSEC_MAX_STATE_BLOB_SIZE; i++) {
EEPROM.write(i + 1, bsecState[i]);
Serial.println(bsecState[i], HEX);
}

EEPROM.write(0, BSEC_MAX_STATE_BLOB_SIZE);
EEPROM.commit();

return true;
}