This is a steam(water)sensor from DFRobot. This steam sensor can be connected to the Arduino IO Expansion shield directly. The output voltage will increase when the humidity of the sensor surface goes up.
Notice:The new version of analog sensor port pin mapping has been changed as the following two features.Please check thetips for changing sensor cable pin mapping while using the I/O Expansion shield. We will continue to update. For the inconvenience caused, please understand.
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
Power supply: 3.3v or 5v
Output voltage signal: 0~4.5v(@5v) or 0~3.0v(@3.3v)