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I want to create a wireless soil moisture sensor, I've go two types of sensors one is yl-69 and the other is watermark the problem is these two type are not calibrated. One of them I mean watermark there is an adaptor that use for it's calibration but this is expensive and without that I couldn't get any information from the sensor, the other one I mean yl-69 is easier to use. When I have 1 kilogram of one type of soil and add 1% water I mean 1 gram to it and then measure the voltage it's diffrent every time and not stable once the voltage stops after adding 6% water and somtimes it goes down after 10% or more. I NEED the suggestion about how can I get information and calibration.
thanks
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