Hello, we have a water tank for the chickens and I'd like to add a gallons-left sender to our little nRFL2401 home network with the CapSense Library. I found some videos on making the capacitor sensor but need some clarification.
One guy's video showed two flat strips of aluminum each coated with epoxy then held apart a set distance with thin foam. The guy suggested that a tube and rod down the center would be better as the outer tube would provide some shielding properties.
I just happen to have a few feet of 3/4" aluminum tube and a length of 1/4" aluminum rod. I can 3D-print some spacers to center the rod in the tube every 12" but I am unclear on the use of the epoxy in the above design.
Can I leave the aluminum bare or will the water affect the capacitance by conducting between the tube and rod?