Electronic Circuit for Detecting Leaf Wetness and Comparison of Two Sensors

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Abstract
An inexpensive, easily constructed circuit for detecting leaf wetness operates on a frequency which is a function of the amount of moisture on a sensor to voltage conversion. Using this circuit the performances of 2 sensors were compared under field conditions. One sensor was a printed circuit board on which a grid network was etched and then painted with latex paint. The other sensor used a piece of white cotton cloth as an artificial leaf on a grid network of fine wires; its performance was superior under all conditions that caused leaf wetness.

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