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Friday, September 6, 2019

Dual Level Soil Moisture Sensor, a new mystery!

In my post on Sept 3, 2019 I talked about re-introducing the dual level soil moisture sensors, and at the time, they seemed to be working correctly, but I would watch them over time...

Well, something interesting is happening, have a look at sensor #64...

The top sensor didn't change much over the 3 days, that's normal, since I had not watered this pot in a bit. The spike upward is when I just watered it today.

The bottom sensor showed a steady increase in moisture, and then when I watered it today, the moisture level dropped!

The two sensors are reading inverse of each other.

Now we look at Sensor #65.

At least here the trend is toward a drier soil for both sensors, although the difference is small. I'll have to wait a few more days and see how it goes. The biggest surprise is why #64 bottom sensor is reading inverse, but #65 bottom seems normal?  They are the same design, and read with the same code... Let's see how this pans out over the next few days.

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