Sensor specifications (Leaf Wetness)
Resistance Range: 5 kΩ ~ >2 MΩ
Output Voltage Range: 1V ~ 3.3V
Length: 5.5 cm
Width: 4 cm
The leaf wetness sensor behaves as a resistance of a very high value (infinite, for practical purposes)
in absence of condensation in the conductive combs that make it up,
and that may fall down to about 5kΩ when it is completely submerged in water.
The voltage at its output is inversely proportional to the humidity condensed on the sensor
and can be read at an analog input of Waspmote.