Like the LPS331AP, the LPS25H provides pressure readings over a range of 260 mbar to 1260 mbar (26 kPa to 126 kPa), and this data can be used to calculate the sensor’s altitude. Our LPS25H carrier mounts the sensor on a 0.4″ × 0.8″ board (0.1″ shorter than our earlier LPS331AP carrier) that breaks out all of its pins, and as usual, we’ve included level shifters and a regulator to make it easy to use in a 5 V system.
Compared to its predecessor, the LPS25H features improved accuracy and reduced noise in its pressure readings. The difference is noticeable in a comparison of altitude estimates from two stationary sensors:
The LPS25H also adds an entirely new feature: it has an embedded FIFO (First In, First Out) buffer, which can be used to store a number of readings for simultaneous transmission, or it can calculate a moving average of up to 32 pressure readings. This averaging smooths the noise in the output even more, as the following graphs demonstrate:
To help you get started with the LPS25H, we will be updating our Arduino library soon to support it. In addition, we plan to do some more comprehensive tests to better demonstrate how the LPS25H, with its moving average feature, compares with the LPS331AP and other pressure sensors.
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