The box with the sensor is buried below ground. The reason for this is to minimise the impact of temperature changes. I have found the sensor to be very sensitive to changes. In the garden also tries to distance the sensor from any moving metallic objects which may impact the readings.
The following shows the sensor box in position:
The compass on the box is to ensure there is correct alignment of the sensor along the east - west axis.
The box about to disappear (I did remove the compass before filling in!)
The control box with the processing electronics is mounted on a fence post in a water tight box.
This is connected to a PicoTech Enviromon system in the shed that monitors the output voltage and records the data. Software on the computer produces an updated graph every few minutes.
I will post some sample graphs to show the results. Hopefully this will work.
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