I'm looking to the low cost RH sensor....I've one...but ...i've no idea to design the signal conditioning for this sensor...capacitive RH sensor...needs ac inputs?....
could somebody explain to me?...is there humidity sensor like temperature sensor...LM35DZ...
I expect that the capacitance increases with humidity, and the capacitive loss will also increase. You can use R-C time constant to measure capacitance with DC, but you need to know the temperature to calculate the relative humidity.