I have two pressure sensors (MPL3115A2) with each connected to a Particle Photon, the sensors are placed next to each other at the same level.
In barometric mode, one sensor reads 95043 Pa, while the other read 95405 Pa. This translates to a difference is 362 Pa.
In altimeter mode, one sensor reads 1742 ft, while the other sensor at the same level reads 1658 ft. This translates to a difference of 84 ft.
I also observed that these differences (pressure & altitude) keep varying over time. I'd appreciate if anyone with experience on these or similar sensors could shed some light on this variance in measurement.
I am trying to use these sensors to get the altitude of the construction elevator in realtime, any suggestions on accurately measuring the elevator height would also be appreciated. This solution seems to be plug and play (Easy on a construction site)