Introduce the function of mobile phone pressure sensor

The mobile phone sensor detects all available sensors on Android phones and vividly shows how they work. Mobile phone sensors can also identify which sensors the phone hardware supports and provide sensing tools that are important to our daily lives. Mobile phone sensors can only detect changes. If the property does not change, the temperature it shows will be very concerned about the height of people who like climbing. The altitude measurement method is generally used in two ways. One is through the GPS global positioning system, and the other is through measuring the atmospheric pressure, and then calculating the altitude according to the pressure value.

Due to technical and other reasons, the general error of GPS calculation altitude will be about ten meters, and if it is in the woods or under the cliff, sometimes even GPS satellite signals are not received. The pressure range can be selected to be wider and the cost can be controlled at a relatively low level. In addition, mobile phone pressure sensors such as the Galaxy Nexus also include a temperature sensor that can capture the temperature to correct the results to increase the accuracy of the measurement results. Therefore, based on the original GPS of the smart phone, the pressure sensor function can be added to make the three-dimensional positioning more accurate.

Many car drivers now use mobile phones to navigate, but often people complain that navigation on the viaduct is often wrong. For example, when on a viaduct, GPS says to turn right, but in fact there is no right-turn exit on the right. This is mainly due to the fact that GPS can't determine if you are on the bridge or under the bridge. The height of the upper and lower levels of a typical viaduct will be a few meters to a dozen meters, and the GPS error may be dozens of meters. Therefore, the above incident can be understood. And if you add a pressure sensor to your phone, it's not the same. His accuracy can be as much as 1 meter, so that you can use GPS to measure the altitude. Error navigation problems are easily solved.

Because it is not possible to receive GPS signals indoors, when a user enters a very thick building, the built-in sensor may lose the satellite signal, so the user's geographical location cannot be identified and the vertical height cannot be perceived. If the mobile phone is combined with pressure sensors and then combined with accelerometers, gyroscopes and other technologies, it can achieve accurate indoor positioning. In this way, when you shop in the mall, you can use mobile phone positioning to tell you where you want to buy the product in the mall, which floor.