Honor 30 does not support a barometer
Air pressure sensor use: GPS calculation of altitude will have an error of about 10 meters, the air pressure sensor is mainly used to correct the altitude error (to about 1 meter), of course, can also be used to assist GPS positioning overpass or floor position, for example, some navigation software has an overpass mode, part of the motion meter APP has a climbing mode are required air pressure sensor. (Some models are not supported, please refer to the actual function)
Principle: The film is connected to a rheostat or capacitor, and the change in air pressure causes the value of the resistor or capacitor to change, so as to obtain the air pressure data.
A little, generally the phone will have a relatively simple pressure sensor, mainly used to test altitude