ArminThe Chinese moisture sensor is exactly what you expect from a $1,- sensor. Crappy.
Corrosion in one week. So time to find something better. It needs to be able to send an AC signal or at least be able to turn off when not in use.
So does anybody have a better solution? I found Chirp.
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Use graphite electrodes.
Also only one of the electrodes is corroded. That should give you a good hint on why it happens.
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the sensor you bought didn't get good coating, actually, the coating is Tin, which is not resistant to the corrosion in your soil. A simple way to find good sensor is looking at the color of the plating, if you see yellow shinny smooth color of the pad, that will indicate it is good, since the yellow pad is coated with Au, which is most resistant materials to any corrosion. or buy it from big names in this area. good luck.
---Ted
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I think I know what went wrong (So I kind of expected this, only hoping it would take longer).
To improve: beter qualitity electrodes, switcing off when not in use.
Unfortunatly very busy at the moment so at the the end of next week, maybe an update
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