People who like mountaineering will be very concerned about their height. There are two commonly used methods for measuring altitude. One is through the GPS global positioning system, and the other is by measuring atmospheric pressure, and then calculating the altitude according to the pressure value.

    Due to the limitations of technology and other reasons, the GPS calculation of altitude will generally have an error of about ten meters, and if you are in the woods or under the cliff, sometimes you can't even receive the GPS satellite signal. The range of air pressure methods can be wider, and the cost can be controlled at a relatively low level. In addition, the pressure sensor also includes a temperature sensor, which can capture the temperature to correct the results to increase the accuracy of the measurement results and make the three-dimensional positioning more accurate.

    The Sencoch GZP absolute pressure series pressure sensor is a miniaturized digital gas pressure sensor with high accuracy and low current consumption, with both pressure and temperature measurement characteristics. The internal signal processor converts the output of pressure and temperature sensors into 24-bit and 16-bit data respectively. Each pressure sensor has been calibrated separately and contains a calibration coefficient. In the application, the coefficient is used to convert the measurement results into real pressure and temperature values. The sensor measurement and calibration coefficients can be obtained through the serial I2C interface.