![]() I tried using a digital output for GND, driving it LOW when measuring that sensor, and setting it as INPUT while measuring the other sensor, but for some reason it didn't make any changeĢ.-Other issue Im having is in 2 of the 3 fields I've installed it, in one of them the sensor has never "seen" any water from the irrigation, it only slowly dropped from saturation (installation) to a total dry reading after weeks. My guess is that it is due to current flowing from one sensor thru the soil to the other and then to ground thru it's 4.7K resistors, thus altering the "probe" resistor value. It also ocurrs when they are placed in the same soil, 1 or 2 ft away. But I still have these 2 issues:ġ.-When I duplicate the driving circuit to use 2 sensors, I see a big resistance increase (500 instead of 300) when both sensors are in the same water glass. I get readings that look very reasonable according to the existing humidity in the sensor, 300-400 Ohm while saturated, several KOhm when dry). Im using the schematic provided by Van der Lee in his vinduino project: Koepel, I had already read all the official documentation from the manufacturer, as well as lots of posts on this forum (including the one you pointed out, thanks) regarding these sensors, but I still have issues I want to share with someone who has used them, they are not related to those posted in those forums
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