Added initial interfaces and some sensors implementing them

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

src/rhusb/rhusb.cxx

@@ -99,6 +99,11 @@ float RHUSB::getTemperature(bool fahrenheit)
     return m_temperature;
 }
 
+float RHUSB::getTemperature()
+{
+  return getTemperature(false);
+}
+
 float RHUSB::getHumidity()
 {
   return m_humidity;

src/rhusb/rhusb.hpp

@@ -25,6 +25,8 @@
 
 #include <string>
 #include <mraa/uart.hpp>
+#include <interfaces/iHumidity.hpp>
+#include <interfaces/iTemperature.hpp>
 
 namespace upm {
 
@@ -53,7 +55,7 @@ namespace upm {
    * @snippet rhusb.cxx Interesting
    */
 
-  class RHUSB {
+  class RHUSB : virtual public iHumidity, virtual public iTemperature {
   public:
     /**
      * RHUSB constructor
@@ -83,7 +85,15 @@ namespace upm {
      * The default is false (degrees Celsius).
      * @return The last temperature reading in Celsius or Fahrenheit
      */
-    float getTemperature(bool fahrenheit=false);
+    float getTemperature(bool fahrenheit);
+
+    /**
+     * Get the current temperature.  update() must have been called
+     * prior to calling this method.
+     *
+     * @return The last temperature reading in Celsius
+     */
+    virtual float getTemperature();
 
     /**
      * Get the current relative humidity.  update() must have been called
@@ -91,7 +101,7 @@ namespace upm {
      *
      * @return The last humidity reading
      */
-    float getHumidity();
+    virtual float getHumidity();
 
     /**
      * Get the firmware identification string.