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Water pressure/depth sensor
#1
Hi All, I know this is way off-topic but there are some really smart people here, and I hope someone can answer this.
I am wondering if a sensor like the BMP388 is capable of measuring pressure underwater, in a way that I could determine the depth it was at?
It would be in a sealed enclosure, and I understand the pressure would need to be converted to depth via testing and I understand it would be different in salt water and fresh water. But all that aside, would it work? If so how accurate might it be?
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#2
I do not know what is your purpose but I could give you an example: measuring the level of a liquid in a tank. A tube is placed in the tank, nearly touching the bottom. A small hand or electrical air pump is placed at the other side of the tube, together with a pressure sensor (BMXxxx). The pressure will be determined by the liquid height above the lower aperture of the tube when air is pumped in. . . .
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#3
(2021-01-24, 08:00 AM)Sailabout Wrote: I do not know what is your purpose but I could give you an example: measuring the level of a liquid in a tank. A tube is placed in the tank, nearly touching the bottom. A small hand or electrical air pump is placed at the other side of the tube, together with a pressure sensor (BMXxxx). The pressure will be determined by the liquid height above the lower aperture of the tube when air is pumped in. . . .

Okay what if the BMXxxx was in for example a small sealed container with air, or a ziplock bag without air. Would it be able to read the pressure increase as it descended in water? Is it "air" pressure that it reads or is it pressure?
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#4
why don't you use an oil pressure type sender? it is analogue but i think is more easy to work with it for underwater projects.

something like this: https://www.banggood.com/Pressure-Transd...rehouse=CN
- SV Haimana
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