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Igor Mammedov 9781915611 mhz19: disable autocalibration for MH-Z19B by default
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>
2019-05-24 00:57:25 +02:00
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2019-02-14 13:49:22 +01:00
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