Revision 0:114b50b41972, committed 2013-06-23

Comitter:

simonbarker

Date:

Sun Jun 23 11:53:24 2013 +0000

Commit message:

HIH-4030 library with comments

Changed in this revision

diff -r 000000000000 -r 114b50b41972 hih-4030.cpp
--- /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

diff -r 000000000000 -r 114b50b41972 hih-4030.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hih-4030.h	Sun Jun 23 11:53:24 2013 +0000
@@ -0,0 +1,19 @@
+#ifndef HIH4030_h
+#define HIH4030_h
+
+#include "mbed.h"
+
+class HIH4030{
+
+public:
+  HIH4030(PinName vout);
+  float ratioHumidity();
+  float sensorRH();
+  float trueSensorRH(float temperature);
+
+private:
+  AnalogIn vout_;
+  float sample;
+  float temperature;
+};
+#endif
\ No newline at end of file