Me and my student team want to use a BMP280 air pressure sensor connected to an Arduino Nano to measure the altitude of a CanSat.
A CanSat is a coca cola can-shaped and can-sized aerial vehicle, which can be released from a sounding-rocket or a plane-/quadcopter-type drone, packed with scientific instruments to do predefined measurements/operations.
In our case, this CanSat is dropped from 300m hight and has to perform an operation as close to 70m altitude as possible.
How precisely (practically) can the BMP280 measure the altitude (given physical noise and internal tolerances of the chipset)
Where is the ideal spot to drill the measurement inlet(s) into our airframe, when the airframe is shaped like a can and is falling vertically without any drift to the 'sides', and where do we have to position the sensor in relation to the position(s) of this/these inlets?
We would really appreciate the oppinions and practical knowledge of experienced people and enthusiasts :)