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This steam sensor can be connected to the Arduino IO Expansion shield directly. The output voltage will increase when the humidity on the sensor surface goes up.
Warning: The connector is not waterproof, please be careful not to put the connector directly in water.
Simple rain detector.
Cheap steam level switch.
Touch sensor based on humidity.
Steam sensor (1 unit).
Analog Sensor Cable (1 unit).
Power supply: 3.3v or 5v.