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Building a LoRaWAN Water Detector using an Arduino MKR WAN 1300 and a Grove Moisture Sensor

Dave Ives
I currently look after production at AB Open. I have a background in the arts, environmental conservation and IT support. In my spare time I do a bit of DJing and I like making things.


August 28, 2019 09:41

Out of experience, I know that these (resistive) sensors suffer from oxidation very fast.(3-4days!)
This is mainly because there's ALWAYS some current flowing between the two measuring points. A way to extend the life of the probe, you could "switch on" the power to the sensor only when it is necessary, and "switch off" when it is not necessary. A digital out + transistor or MosFet could do this job.
We can assume that the life of the probe is inversely proportional to the time it's on. So if a sensor wears out in 4 days (constant ON), then it will take about 400 days when switched on 1% of the time.
If you really need quasi constant measuring, I suggest to use another kind of sensor (e.g. capacitive instead of resistive)
good luck !

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