Hi - bit of an odd one, here... I'm a beginner, as you'll see:
I want to thread a wire down into an underground pipe from time to time to check for the presence of standing water.
My thought is to use a two-conductor wire, maybe 18-gauge, with a small (fixed) gap between the ends, and send high-voltage low-current electricity down the line.
I don't need to power anything with the "result" of the test, I just need any clumsy way to know if there is water down there... I can imagine using some old wall transformer, take the 9V or whatever it is and go through another transformer, maybe bust out some Ohm's law to figure out some resistors to limit current?, and put some kind of LED or other bulb in the circuit that would indicate a closed connection.
But I'm sure there's a better/smarter way? Any ideas?
Thanks for any suggestions,
-c