Barometer/Altimeter, the tool of weathermen and mountain goers throughout history, now on a click board.
Barometer click carries LPS25HB, the type of sensor you’ll find in airplanes, alpine watches, but also weather stations. It’s a highly sensitive piezoelectric absolute pressure sensor that can detect as little as 0.01 hPa RMS in high resolution mode. The measurement range is from 260 to 1260 hPa (a hectopascal is equal to a milibar)
A barometer and altimeter are essentially the same thing. The only difference is whether you use it as a stationery device to monitor changes in atmospheric pressure (to brace yourself for a headache if you see a declining trend) or, as a portable sensor to gauge altitude (the pressure drops the higher you go; the value at sea level is used as a reference point).
Barometer click is versatile enough to be suitable for your design whichever way you go. The board can use either SPI or I2C interfaces. There’s also an interrupt pin which could be configured in two ways: (1) to send an alert when a certain threshold value is reached; or (2) to send a signal whenever there’s a change in pressure values (this is done to reduce power consumption).