Diff: hih-4030.cpp

Revision:

0:114b50b41972

Child:

1:f0ae84350631

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hih-4030.cpp	Sun Jun 23 11:53:24 2013 +0000
@@ -0,0 +1,33 @@
+#include "hih-4030.h"
+
+HIH4030::HIH4030(PinName vout):vout_(vout) {
+  
+}
+
+/*
+    gives humidity as a ratio of VDD
+*/
+float HIH4030::ratioHumidity(){
+  //poll analogue in
+  return vout_.read(); 
+}
+
+/*
+    gives humidity as a percentage - numbers taken from datasheet
+*/
+
+float HIH4030::sensorRH(){
+  //poll analogue in
+  sample = vout_.read()*5; //multiply by 5 as sample is a decimal of Vdd
+  return (sample-0.958)/0.0307;
+}
+
+/*
+    gives humidity adjusted for temperature (in degrees C) - numbers taken from datasheet
+*/
+
+float HIH4030::trueSensorRH(float temperature){
+  float rh = sensorRH();
+  temperature = temperature*0.00216;
+  return rh/(1.0546 - temperature);
+}
\ No newline at end of file