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Hi, sorry for that bro thanks for pointing that out I will take care of these thing from next time
According to chemistry stainless steel is alloy of iron and carbon where as galvanization is process of electroplating of a metal with zinc as zinc is placed low in activity series it is less prone to oxidation insense rusting than the stainless steel so i will recommend to use galvanised nail or else plated the nail with chromium or nickel. The best way to avoid rust in cheap way is to add some soldier on the sensor. Let me know if you need more help on it
DIY SOIL MOISTURE SENSOR CHEAP YET ACCURATE !
I know that the galvanized nail may also corroded after 6 month the the quick fix is to upgrade to chrominium plate nail or else cover the whole nail with a solder. Talking about calibration it takes 5 min and in most cases it doesn't need calibration
It needs a little bit of calibration it can be done by taking a soil completely wet making it as reference and to make sure that you have above 95% of moisture if not try changing the distance between probe or change the variable in code
DIY SOIL MOISTURE SENSOR CH...View Instructable »