I'm toying with some ideas for a holiday project.
What I want to do is to reliably detect when a device is submerged in the ocean, or perhaps more importantly, when the device is *out* of salt water.
I was thinking either by pressure or two electrodes. Problem is, I have no idea how reliable either scheme would be, either as far as detection was concerned or long-term reliability (e.g. corrosion).
Does anyone has any suggestions as to what has worked for them, or anything I should look at in particular?