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Looking at the principles of operation of the Capacitive soil moisture sensor, testing its output in wet to dry conditions, and taking it out to the garden for a real soil test!
These sensors on Amazon (affiliate links):
Amazon.com: amzn.to/2LJ6kLS
Amazon.ca: amzn.to/2JnQDrV
Capacitive Sensor References:
Capacitive-Based Liquid Level Sensing Sensor Reference
Design
www.ti.com/lit/ug/tidu736a/tid...
The Fringe-Capacitance of Etching Holes for CMOS-MEMS
www.mdpi.com/2072-666X/6/11/14...
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