Humidity Sensor HS1101

This Humidity Sensor is a very simple and inexpensive device based on a capacitive cell (capacitance value chances according to humidity). It is a inexpensive option to add humidity compensation to a project that doesn't require a very accurate Humidity value reading.

• Full interchangeability with no calibration required
• Instantaneous desaturation and fast response time
• Compatible with automatized assembly processes, including wave soldering, reflow and water immersion
• High reliability and lont term stability
• Power requirements 5 to 10 VDC
• Operating Temperature -40 to 100 Celcius
• Humidity Operating Range 0 to 99 % RH
• Reading: Capacitive Component from 177 to 183 pF

You can download the full datasheet from this link.

This sensor is also sold by Parallax and they developed nice documentation and sample code available at their website here.