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To resolve the RAM overflow issue and run the BSEC2 library with multiple BME68x sensors on a standard board, you need to make a few adjustments to the configuration and code. Here's how you can proceed: 1. Specify the number of sensors: - In the BSEC2 library, the number of sensors is defined by the `NUM_BME68X_UNITS` macro. - Ensure that `NUM_BME68X_UNITS` is set to the actual number of sensors you are using, which in your case is 8. - Remove or comment out the conflicting `NUM_OF_SENS` definition to avoid confusion. 2. Adjust memory allocation: - The BSEC2 library allocates memory for each sensor instance using the `BSEC_INSTANCE_SIZE` macro. - With 8 sensors, the total memory required is `8 * BSEC_INSTANCE_SIZE`, which is causing the RAM overflow. - To accommodate more sensors, you may need to optimize memory usage in other parts of your code or consider using a board with more RAM. 3. Enable multi-instance support: The BSEC2 library supports multi-instance functionality, allowing you to use multiple sensors simultaneously. Ensure that the multi-instance feature is properly enabled and configured in your code. You may need to modify the example code to handle multiple sensor instances correctly. ... View more

If these options do yield positive results, it might be necessary to implement an application-level calibration, with a known accurate reference point, to correct the readings. For example, if you know the "Pump" sensor is providing a closer actual value, you can use it as a correction factor for the BME280 sensors. As the BME280 provides high accuracy and precision for its price point, such discrepancies might hint more towards abnormalities in individual units rather than a widespread issue. If such large differences persist consistently across multiple pairs, it might be worth reaching out to the relevant customer support or considering an alternative sensor for your requirements. Remember also that the accuracy of any individual BME280 at any point is within the stated accuracy tolerance of ±3%RH. If these discrepancies lie within the stated tolerance range, this might not be indicative of any issue. If the problem is still not solved, I suggest you contact Bosch Sensortec. ... View more