The air pressure sensor was first used in smartphones on the Galaxy Nexus, and some flagship Android phones later included this sensor, such as Galaxy SIII, Galaxy Note 2 and Xiaomi Mi 2 mobile phones, but everyone is still very concerned about the air pressure sensor. strangeness.
Like the literal meaning, the air pressure sensor is used to measure the air pressure, but what is the use of measuring air pressure for ordinary mobile phone users?Altitude measurement, for people who like to climb mountains, they will be very concerned about their altitude.There are two commonly used methods of measuring altitude, one is through GPS global positioning system, the other is through measuring atmospheric pressure, and then calculating altitude according to the pressure value.
Due to the limitation of technology and other reasons, the error of GPS calculation of altitude is generally about ten meters, and if it is in the woods or under a cliff, sometimes it can not even receive GPS satellite signals.
The air pressure method has a wider range of options, and the cost can be controlled at a relatively low level.
In addition, the barometric pressure sensor of mobile phones such as the Galaxy Nexus also includes a temperature sensor, which can capture the temperature to correct the results to increase the accuracy of the measurement results.
Many drivers now use their mobile phones for navigation, but people often complain that navigating on viaducts is often wrong.For example, when you are on a viaduct, the GPS says to turn right, but in fact there is no right-turn exit on the right. This is mainly due to the wrong navigation caused by the GPS unable to determine whether you are on the bridge or under the bridge.Generally, the height of the upper and lower floors of the viaduct will be a few meters to a dozen meters away, and the GPS error may be tens of meters, so the above is understandable.However, if an air pressure sensor is added to the mobile phone, it will be different. Its accuracy can be achieved with an error of 1 meter, so that the GPS can be well assisted to measure the altitude, and the problem of wrong navigation can be easily solved.
Indoor Positioning
Because the GPS signal cannot be received well indoors, when the user enters a thick building, the built-in sensor may lose the satellite signal, so the user’s geographic location cannot be recognized, and the vertical height cannot be sensed.And if the mobile phone is equipped with an air pressure sensor and combined with accelerometers, gyroscopes and other technologies, accurate indoor positioning can be achieved. In this way, when you shop in the mall in the future, you can use the mobile phone location to tell you where the product you want to buy is located in the mall and on which floor.
In addition, the air pressure sensor can also provide relevant information for fishing enthusiasts (the stratification and activity of fish in the water are related to atmospheric pressure) or functions such as weather forecast.
However, the current air pressure sensor is still in a neglected state. In order for the air pressure sensor to be understood and used by more people, it still needs the maturity and popularization of some related technologies, and more developers launch more applications and related technologies for this sensor. Function.
Post time: Aug-28-2022