Has any had any experience with making moisture sensors using galvanized nails and reading the values with arduino. I'm trying to get some stuff together to make a plant growing system using the arduino.
Try Google, "Arduino" "moisture" has quite a few hits.
read on a thread once that you can do that quite easily and if you put the nails under program control, so there is only a short current every hour you will not get things like electrolysis of the soil. (not substantial)