How to convert analog value of HR202 to RH
Posted: Mon Apr 22, 2013 11:24 pmIs there an equation to convert the analog value to relative humidity in %?
In the HR202 have graph resistance over humidity.
In the circuit humidity sensor module it shows have a pull-up 10K. So, it be a voltage divider.
Microcontroller just read analog voltage. Then, from analog voltage convert to resistance using voltage divider formula.
From the resistance convert to humidity. From the tabulated table, you can get the formula by using Curve Fitting.
Ex curve fitting HSM-20G and Maple Curve Fitting.