The BME58M332 uses the NDIR (non-dispersive infrared) method to calculate the concentration of carbon dioxide from measuring the infrared value that has been absorb by carbon dioxide. Each module has been calibrated at the factory.
You can use the UART interface to modify multiple parameters, such as calibration value, detection range, auto calibration setting, and so on. The product also provides three calibration methods, manually calibrating, command calibrating and auto-calibrating.

BME58M332 has the same functions as the BM25S3321-1. The difference between them is that the BME58M332 uses level shift circuit and a LDO IC HT7833 to break out the BM25S3321-1’s pins to match BMCOM connectors and can directly connect to BMduino development boards, such as BM53A367A.
You can use the product with other development boards, such as Arduino UNO, as well.

Calibration

The BME58M332 provides three methods for zero calibration.
The zero calibration means calibrate the module to the concentration of 400ppm.
Ensure the module has been operated in stable carbon dioxide environment of 400ppm for at least 20 minutes.

1. Manually calibrating
   Pull low the HD pin for at least 7 seconds to initiate zero calibration.
2. Command calibrating
   The module provides zero calibration command (command W01) and span point calibration command (command W02). *The zero calibration should be completed before the span point calibration.
   Ensure that the module has been operated in a stable carbon dioxide environment for the concentration that you need to calibrate for at least 20 minutes.
3. Auto-calibrating
   The module provides auto-calibrating command (command W05).
   After enabling the auto-calibrating function, the module determines the zero point itself during a period and calibrates to the concentration (400ppm calibration).