Hi,
Thanks for your inquiry.
BMP581 is our latest pressure sensor that is based on capacitance change technology, while BMP390 resistance change technology. Therefore, BMP581 has better absolute accuracy and offset change over temperature, etc. In addition, BMP581 can directly output pressure measurements in the unit of Pa, while BMP390 needs to apply formula to calculate the final pressure values in the unit of Pa.
So BMP581 is highly recommended for your application. If you need waterproof pressure sensor, then you may consider BMP585. You can start your evaluation on BMP581 or BMP585 by using our shuttle board at https://www.bosch-sensortec.com/media/boschsensortec/downloads/shuttle_board_flyer/application_board_3_1/bst-bmp581-sf000.pdf that is available from Digikey and Mouser.
Thanks.
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