If you project demand only Humidity sensing, this is the sensor to use. The humidity sensor module is sensitive to environmental humidity, generally used to detect ambient humidity by adjusting the potentiometer, for detecting the humidity can change the threshold ( i.e. the humidity control). The HR202 Humidity Detection Sensor  Module can be applied to the storage compartment, indoor air quality control, building automation, medical, industrial control systems wide range of applications and research fields

Features:

Can detect the humidity of the surrounding environment

Sensitivity is adjustable (blue digital potentiometer adjustment in the figure)

The comparator uses LM393 chip and works stably.

Specification:

Working voltage 3.3V-5V

Output form: a Analog voltage output b Digital switching output (0 and 1)

Indicator light: power indicator led and digital switch output indicator led

Module interface description: 

VCC external 3.3V-5V

GND external GND

DO small board switch digital output interface (0 and 1)

AO small board analog output interface