HR202 Humidity Sensor (PIC16) code request

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No22Ben

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Hi guys, I'm currently working on a humidity project.
I'd bought the "SN HMD MOD" (HR202) sensor , https://img.dxcdn.com/productimages/sku_152031_1.jpg

The sensor is basically consists of 4 pins (Vcc, GND, AO & DO). May I know what is the formula or equations to calculate humidity ?
Full PIC coding & explanation will be much appreciated

thanks again~
 

You are using HR 202 Sensor module and not just sensor. The module is giving outputs DO (Digital Out) and AO (Analog Out). You can connect the AO pin to ADC pin and see what adc value you get for the humidity inside the place you are measuring. Based upon that calibrate in the code. You need to measure the room humidity with a standard humidity sensor. If the sensor o/p is linear then you can do like this.

If adc value you get is 418 for %RH then if standard value you get with a RH meter is %20 then just use a factor to convert 418 to 20.
 

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