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+--- Thread: Water pressure/depth sensor (/showthread.php?tid=3227)
Water pressure/depth sensor - rastam4n - 2021-01-23
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?
RE: Water pressure/depth sensor - Sailabout - 2021-01-24
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. . . .
RE: Water pressure/depth sensor - rastam4n - 2021-01-24
(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?
RE: Water pressure/depth sensor - sebba - 2021-01-28
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-Transducer-Sensor-Oil-Fuel-Diesel-Gas-Water-Air-Sensor-p-1007341.html?cur_warehouse=CN