I'm working on a school project and I intend to build a system to measure distance in a small tank of water and therefore to be able to detect objects placed in the tank (such as a box).
I just need a sensor that works underwater. I intend to leave at first the water very still and clean at first and ultimately change different factors to see if the results are different.
I looked up on the internet for different sensors but they all seem to only work for air use.
If you have any information, advice, article or tutorial about how to build this system, could you please send me the links.