in south western sydney we had some rain yesterday, but on average it's usaully just the normal dryCan't wait to see how you get on.
I haven't checked the news - are you lot experiencing floods or droughts today?
What about a carbon rod eg. a carbon welding/cutting electrode or a centre electrode from a primary cell battery, would say a tunsten TIG/GTAW electrode be OK?
The trouble with the resistance approach seems to be that any change to the chemical composition of the soil will mean recalibration. If you apply fertiliser, for instance, the conductivity of the ground will change.ok i've found somthing that seems to work very well
in my house cleaning adventures i found a box of rivet tailings so i've wired up 2 of them between gnd and adc2 and from adc2 to v+ i've got a 10k resistor
when the soil is dry i get adc readings around 150 to 200
the dryer it goes the lower the reading and after i watered it the readings peaked at 350
which is pretty much what i want
the aluminium tailing only have to last 2 months