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MH-Z19B allows to enable/disable 'automatic baseline calibration', which is enabled by default (MH-Z19B v1.2 datasheet). It operates on too short 24hr interval. So if the place where sensor is located is not ventilated well "every" day, ABC will make sensor under-report CO2 value, since baseline (400ppm) is moved to lowest observed value in 24hr. With such short recalibrartion window, sensor often doesn't show correct CO2 levels when ABS is left enabled. Disable it on boot defaut and add 'automatic_baseline_calibration' option to allow override from config. Signed-off-by: Igor Mammedov <imammedo@redhat.com>
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