If you're looking for an air pressure sensor that's accurate and affordable, the Barometer Phidget has you covered. It connects to a VINT port and measures absolute pressures within the range of 50kPa and 110kPa, making it great for barometer applications. If you happen to read a pressure outside of this range, an error will be thrown telling you that the measurement has saturated.
Once you have an absolute pressure reading, you can correct for altitude, resulting in a corrected atmospheric pressure reading. Alternatively, you could calibrate the sensor to measure changes in elevation, making it an altimeter. For more details on how to implement these calculations, see the technical section of the User Guide.
|Sensor Type||Gas Pressure (Absolute)|
|Pressure Min||50 kPa|
|Pressure Max||110 kPa|
|Pressure Resolution||250 mPa|
|Measurement Error Max||± 0.62 %|
|Relative Measurement Error Max||± 0.08 %|
|Sampling Interval Max||60 s/sample|
|Sampling Interval Min||100 ms/sample|
|Current Consumption Min||25 µA|
|Current Consumption Max||4 mA|
|Operating Temperature Min||-40 °C|
|Operating Temperature Max||85 °C|