Simon Barker / HIH-4030

Library for taking datasheet corrected relative humidity measurements with HIH-4030 humidity sensor

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hih-4030.cpp

00001 #include "hih-4030.h"
00002 
00003 HIH4030::HIH4030(PinName vout):vout_(vout) {
00004   
00005 }
00006 
00007 /*
00008     gives humidity as a ratio of VDD
00009 */
00010 float HIH4030::ratioHumidity(){
00011   //poll analogue in
00012   return vout_.read(); 
00013 }
00014 
00015 /*
00016     gives humidity as a percentage - numbers taken from datasheet
00017 */
00018 
00019 float HIH4030::sensorRH(){
00020   //poll analogue in
00021   sample = vout_.read()*5; //multiply by 5 as sample is a decimal of Vdd
00022   return (sample-0.958)/0.0307;
00023 }
00024 
00025 /*
00026     gives humidity adjusted for temperature (in degrees C) - numbers taken from datasheet
00027 */
00028 
00029 float HIH4030::trueSensorRH(float temperature){
00030   float rh = sensorRH();
00031   temperature = temperature*0.00216;
00032   return rh/(1.0546 - temperature);
00033 }
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