Moisture sensor is * simple humidity sensor.
Moisture sensor mainly include resistive, capacitive two kinds big.
The characteristics of the humidity sensitive resistor is in the substrate is covered a layer of membrane made with a sense of wet materials, when the water vapor in the air adsorption on feeling wet film, components of resistivity and resistance value changes, use this feature to measure the humidity.
Humidity-sensitive capacitance is commonly made of polymer film capacitance, the commonly used polymer materials such as polystyrene, polyimide, butyric acid, acetic acid fiber.
When the environment humidity change, humidity-sensitive capacitance of the dielectric constant change, make its capacitance also produces change, the capacitance variation is proportional to the relative humidity.
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