I am looking into constructing a closed and small device with arduino sensors that goes underwater. It has to be submerged into water and back several times, and that is made by someone with a rope attached to it. So it needs a way to communicate to the surface that it reached the bottom, so that the person can start pulling. It is planned for it to go no more than 30 meters under the surface.
So I though that a wireless way to comunicate from underwater to the surface just for that would be nice, and not a big trouble (Like when the pressure stops changing a LED light on in the surface). But I know nothing about eletronics, so I need help. Is there a simple way to do it? What can I use? I would like to keep it small...
And I woudn't like it to have a wire...
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