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.

APPLICATIONS

• Simple rain detector
• Cheap steam level switch
• Touch sensor based on humidity

SPECIFICATION

• Power supply: 3.3v or 5v
• Output voltage signal: 0~4.5v(@5v) or 0~3.0v(@3.3v)
• Pin definition:
• Analog output(Blue wire)
• GND(Black wire)
• Power(Red wire)
• Size: 30x20x6mm (0.18x0.79x0.24"")