I've just talked myself into an interesting project. Concider a rectliniear box constructed of 1/8" thick polypropylene. My task is to sense the level of sea water inside the box, and while a continuous level would be preferred a simple high and low indication is acceptable.
As this box is located literally in the middle of a harbor inside a lighthouse where the only power typically available is 12VDC I'm not inclined to make many experiments on site. I eventually will get a piece of polypro to test against, but desire a complete sensor I can install once upon completion and sleep soundly that is will continue to work.
I would prefer to leave the box undisturbed and sense thru the box itself, perhaps using a projected capacitance sensor. Does anyone know if sea water is a good as a finger when a touch sensor is involved?
Anyone have any good & tested ideas to start with?
As this box is located literally in the middle of a harbor inside a lighthouse where the only power typically available is 12VDC I'm not inclined to make many experiments on site. I eventually will get a piece of polypro to test against, but desire a complete sensor I can install once upon completion and sleep soundly that is will continue to work.
I would prefer to leave the box undisturbed and sense thru the box itself, perhaps using a projected capacitance sensor. Does anyone know if sea water is a good as a finger when a touch sensor is involved?
Anyone have any good & tested ideas to start with?