Added interfaces:

iEC
iEmg
iClock
iHeartRate
iLineFinder
iOrp

Signed-off-by: Stefan Andritoiu <stefan.andritoiu@gmail.com>

include/interfaces/iClock.hpp

@@ -0,0 +1,52 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Real Time Clock (RTC) Modules
+*/
+  class iClock
+  {
+  public:
+    virtual ~iClock() {}
+
+    /**
+     * Loads all the time values
+     *
+     * @return True if time data loaded successfully
+     */
+    virtual bool loadTime() = 0;
+
+    /**
+     * Sets the time. You should call loadTime() beforehand to
+     * maintain consistency
+     *
+     * @return True if time is set successfully
+     */
+    virtual bool setTime() = 0;
+  };
+}

include/interfaces/iEC.hpp

@@ -0,0 +1,45 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Electrical Conductivity (EC) Sensors
+*/
+  class iEC
+  {
+  public:
+    virtual ~iEC() {}
+
+    /**
+     * Get computed EC (ms/cm) value from the sensor.
+     *
+     * @return EC value in ms/cm.
+     */
+    virtual float getECValue() = 0;
+
+  };
+}

include/interfaces/iEmg.hpp

@@ -0,0 +1,49 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Electromyography (EMG) Sensors
+*/
+  class iEmg
+  {
+  public:
+    virtual ~iEmg() {}
+
+    /**
+     * Calibrates the EMG reader
+     */
+    virtual void calibrate() = 0;
+
+    /**
+     * Measures muscle signals from the reader
+     *
+     * @return Muscle output as analog voltage
+     */
+    virtual int value() = 0;
+  };
+}

include/interfaces/iHeartRate.hpp

@@ -0,0 +1,44 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Heart Rate sensors
+*/
+  class iHeartRate
+  {
+  public:
+    virtual ~iHeartRate() {}
+
+    /**
+     * Retrieve the computed heart rate
+     *
+     * @return Computed heart rate
+     */
+    virtual int getHeartRate() = 0;
+  };
+}

include/interfaces/iLineFinder.hpp

@@ -0,0 +1,51 @@
+/*
+ * Author: Mihai Stefanescu <mihai.stefanescu@rinftech.com>
+ * Copyright (c) 2018 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+namespace upm
+{
+/**
+ * @brief Interface for Line Finder Modules
+*/
+  class iLineFinder
+  {
+  public:
+    virtual ~iLineFinder() {}
+
+    /**
+     * Determines whether white has been detected
+     *
+     * @return True if white is detected
+     */
+    virtual bool whiteDetected() = 0;
+    /**
+     * Determines whether black has been detected
+     *
+     * @return True if black is detected
+     */
+    virtual bool blackDetected() = 0;
+
+  };
+}

src/dfrec/dfrec.cxx

@@ -73,6 +73,12 @@ float DFREC::getEC()
   return dfrec_get_ec(m_dfrec);
 }
 
+float DFREC::getECValue()
+{
+  DFREC::update();
+  return DFREC::getEC();
+}
+
 float DFREC::getVolts()
 {
   return dfrec_get_volts(m_dfrec);

src/dfrec/dfrec.hpp

@@ -31,6 +31,7 @@
 #include <string.h>
 
 #include "dfrec.h"
+#include <interfaces/iEC.hpp>
 
 namespace upm {
   /**
@@ -65,7 +66,7 @@ namespace upm {
    * @snippet dfrec.cxx Interesting
    */
 
-  class DFREC {
+  class DFREC : virtual public iEC {
   public:
 
     /**
@@ -120,6 +121,13 @@ namespace upm {
      */
     float getEC();
 
+    /**
+     * Get computed EC (ms/cm) value from the sensor. update() is called
+     * in this function.
+     * @return EC value in ms/cm.
+     */
+    virtual float getECValue();
+
     /**
      * Get the measured volts from the sensor. update() must have been
      * called prior to calling this function.

src/ds1307/ds1307.hpp

@@ -28,6 +28,7 @@
 
 #include <string>
 #include <mraa/i2c.hpp>
+#include <interfaces/iClock.hpp>
 
 #define DS1307_I2C_BUS     0
 #define DS1307_I2C_ADDR    0x68
@@ -69,7 +70,7 @@ namespace upm {
    * @image html ds1307.jpg
    * @snippet ds1307.cxx Interesting
    */
-  class DS1307 {
+  class DS1307 : virtual public iClock {
   public:
     /**
      * DS1307 constructor
@@ -83,7 +84,7 @@ namespace upm {
      *
      * @return True if time data loaded successfully
      */
-    bool loadTime();
+    virtual bool loadTime();
 
     /**
      * Sets the time. You should call loadTime() beforehand to
@@ -91,7 +92,7 @@ namespace upm {
      *
      * @return True if time is set successfully
      */
-    bool setTime();
+    virtual bool setTime();
 
     /**
      * Enables an oscillator on the clock.
@@ -132,7 +133,7 @@ namespace upm {
      * Converts a BCD value into decimal
      *
      * @param val BCD value to convert
-     * @return Converted decimal value 
+     * @return Converted decimal value
      */
     unsigned int bcdToDec(uint8_t val);
 
@@ -190,5 +191,3 @@ namespace upm {
     mraa::I2c m_i2c;
   };
 }
-
-

src/ecezo/ecezo.cxx

@@ -81,6 +81,12 @@ float ECEZO::getEC()
     return ecezo_get_ec(m_ecezo);
 }
 
+float ECEZO::getECValue()
+{
+    ECEZO::update();
+    return ECEZO::getEC();
+}
+
 float ECEZO::getTDS()
 {
     return ecezo_get_tds(m_ecezo);

src/ecezo/ecezo.hpp

@@ -30,6 +30,7 @@
 #include <unistd.h>
 
 #include "ecezo.h"
+#include <interfaces/iEC.hpp>
 
 namespace upm {
     /**
@@ -57,7 +58,7 @@ namespace upm {
      * @snippet ecezo.cxx Interesting
      */
 
-    class ECEZO {
+    class ECEZO : virtual public iEC {
     public:
 
         /**
@@ -127,6 +128,14 @@ namespace upm {
          */
         float getEC();
 
+        /**
+         * Measures and retrieves the Electrical Conductivity (EC)
+         * value in microsiemens. update() is called during this function.
+         *
+         * @return EC value in microsiemens
+         */
+        virtual float getECValue();
+
         /**
          * Retrieve the last measured Total Dissolved solids (TDS) value.
          * update() must have been called before calling this

src/ehr/ehr.cxx

@@ -65,12 +65,12 @@ uint32_t EHR::getMillis()
   gettimeofday(&now, NULL);
 
   // compute the delta since m_startTime
-  if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 ) 
+  if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 )
     {
       elapsed.tv_usec += 1000000;
       elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec - 1;
-    } 
+    }
-  else 
+  else
     {
       elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec;
     }
@@ -92,7 +92,7 @@ void EHR::clearBeatCounter()
 void EHR::startBeatCounter()
 {
   // install our interrupt handler
-  mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_RISING, 
+  mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_RISING,
                 &beatISR, this);
 }
 
@@ -117,7 +117,7 @@ int EHR::heartRate()
 {
   uint32_t millis = getMillis();
   uint32_t beats = beatCounter();
-  
+
   float heartRate = 0;
   // wait at least 5 seconds before attempting to compute the
   // heart rate
@@ -128,3 +128,8 @@ int EHR::heartRate()
 
   return int(heartRate);
 }
+
+int EHR::getHeartRate()
+{
+    return EHR::heartRate();
+}

src/ehr/ehr.hpp

@@ -27,6 +27,7 @@
 #include <stdint.h>
 #include <sys/time.h>
 #include <mraa/gpio.h>
+#include <interfaces/iHeartRate.hpp>
 
 namespace upm {
   /**
@@ -46,12 +47,12 @@ namespace upm {
    * @brief API for the  Ear-clip Heart Rate Sensor
    *
    * UPM module for the  ear-clip heart rate sensor. It is used to measure your
-   * heart rate. 
+   * heart rate.
    *
-   * @image html ehr.jpg 
+   * @image html ehr.jpg
    * @snippet ehr.cxx Interesting
    */
-  class EHR {
+  class EHR : virtual public iHeartRate {
   public:
     /**
      * EHR constructor
@@ -110,17 +111,22 @@ namespace upm {
      */
     int heartRate();
 
+    /**
+     * Retrieve the computed heart rate
+     *
+     * @return Computed heart rate
+     */
+    virtual int getHeartRate();
+
   private:
     /**
      * Beat interrupt service routine (ISR)
      *
      */
     static void beatISR(void *ctx);
-    
+
     volatile uint32_t m_beatCounter;
     struct timeval m_startTime;
     mraa_gpio_context m_gpio;
   };
 }
-
-

src/emg/emg.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/aio.h>
+#include "interfaces/iEmg.hpp"
 
 namespace upm {
   /**
@@ -43,14 +44,14 @@ namespace upm {
    * @con analog
    *
    * @brief API for the Grove EMG Muscle Signal Reader
-   * 
+   *
    * Grove EMG muscle signal reader gathers small muscle signals,
    * then processes them, and returns the result
    *
    * @image html emg.jpg
    * @snippet emg.cxx Interesting
    */
-  class EMG {
+  class EMG : virtual public iEmg {
   public:
     /**
      * Grove EMG reader constructor
@@ -66,18 +67,16 @@ namespace upm {
     /**
      * Calibrates the Grove EMG reader
      */
-    void calibrate();
+    virtual void calibrate();
 
     /**
      * Measures muscle signals from the reader
      *
      * @return Muscle output as analog voltage
      */
-    int value();
+    virtual int value();
 
   private:
     mraa_aio_context m_aio;
   };
 }
-
-

src/groveehr/groveehr.cxx

@@ -65,12 +65,12 @@ uint32_t GroveEHR::getMillis()
   gettimeofday(&now, NULL);
 
   // compute the delta since m_startTime
-  if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 ) 
+  if( (elapsed.tv_usec = now.tv_usec - m_startTime.tv_usec) < 0 )
     {
       elapsed.tv_usec += 1000000;
       elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec - 1;
-    } 
+    }
-  else 
+  else
     {
       elapsed.tv_sec = now.tv_sec - m_startTime.tv_sec;
     }
@@ -92,7 +92,7 @@ void GroveEHR::clearBeatCounter()
 void GroveEHR::startBeatCounter()
 {
   // install our interrupt handler
-  mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_RISING, 
+  mraa_gpio_isr(m_gpio, MRAA_GPIO_EDGE_RISING,
                 &beatISR, this);
 }
 
@@ -117,7 +117,7 @@ int GroveEHR::heartRate()
 {
   uint32_t millis = getMillis();
   uint32_t beats = beatCounter();
-  
+
   float heartRate = 0;
   // wait at least 5 seconds before attempting to compute the
   // heart rate
@@ -128,3 +128,8 @@ int GroveEHR::heartRate()
 
   return int(heartRate);
 }
+
+int GroveEHR::getHeartRate()
+{
+    return GroveEHR::heartRate();
+}

src/groveehr/groveehr.hpp

@@ -27,6 +27,7 @@
 #include <stdint.h>
 #include <sys/time.h>
 #include <mraa/gpio.h>
+#include <interfaces/iHeartRate.hpp>
 
 namespace upm {
   /**
@@ -48,12 +49,12 @@ namespace upm {
    * @brief API for the Grove Ear-clip Heart Rate Sensor
    *
    * UPM module for the Grove ear-clip heart rate sensor. It is used to measure your
-   * heart rate. 
+   * heart rate.
    *
-   * @image html groveehr.jpg 
+   * @image html groveehr.jpg
    * @snippet groveehr.cxx Interesting
    */
-  class GroveEHR {
+  class GroveEHR : virtual public iHeartRate {
   public:
     /**
      * GroveEHR constructor
@@ -112,17 +113,22 @@ namespace upm {
      */
     int heartRate();
 
+    /**
+     * Retrieve the computed heart rate
+     *
+     * @return Computed heart rate
+     */
+    virtual int getHeartRate();
+
   private:
     /**
      * Beat interrupt service routine (ISR)
      *
      */
     static void beatISR(void *ctx);
-    
+
     volatile uint32_t m_beatCounter;
     struct timeval m_startTime;
     mraa_gpio_context m_gpio;
   };
 }
-
-

src/groveemg/groveemg.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/aio.h>
+#include "interfaces/iEmg.hpp"
 
 namespace upm {
   /**
@@ -51,7 +52,7 @@ namespace upm {
    * @image html emg.jpg
    * @snippet groveemg.cxx Interesting
    */
-  class GroveEMG {
+  class GroveEMG : virtual public iEmg {
   public:
     /**
      * Grove EMG reader constructor
@@ -67,18 +68,16 @@ namespace upm {
     /**
      * Calibrates the Grove EMG reader
      */
-    void calibrate();
+    virtual void calibrate();
 
     /**
      * Measures muscle signals from the reader
      *
      * @return Muscle output as analog voltage
      */
-    int value();
+    virtual int value();
 
   private:
     mraa_aio_context m_aio;
   };
 }
-
-

src/grovegsr/grovegsr.cxx

@@ -68,3 +68,8 @@ int GroveGSR::value()
 	int val = mraa_aio_read(m_aio);
 	return val;
 }
+
+float GroveGSR::getECValue()
+{
+	return (float) GroveGSR::value();
+}

src/grovegsr/grovegsr.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/aio.h>
+#include <interfaces/iEC.hpp>
 
 namespace upm {
   /**
@@ -44,7 +45,7 @@ namespace upm {
    * @con analog
    *
    * @brief API for the Grove GSR Galvanic Skin Response Sensor
-   * 
+   *
    * Measures the electrical conductance of skin
    * to measure strong emotional reactions.
    * In other words, it measures sweat on your fingers
@@ -53,7 +54,7 @@ namespace upm {
    * @image html gsr.jpg
    * @snippet grovegsr.cxx Interesting
    */
-  class GroveGSR {
+  class GroveGSR : virtual public iEC {
   public:
     /**
      * Grove GSR sensor constructor
@@ -78,9 +79,14 @@ namespace upm {
      */
     int value();
 
+    /**
+     * Gets the electrical conductance of the skin from the sensor
+     *
+     * @return Electrical conductance of the skin
+     */
+    virtual float getECValue();
+
   private:
     mraa_aio_context m_aio;
   };
 }
-
-

src/grovelinefinder/grovelinefinder.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/gpio.h>
+#include <interfaces/iLineFinder.hpp>
 
 namespace upm {
   /**
@@ -53,7 +54,7 @@ namespace upm {
    * @image html grovelinefinder.jpg
    * @snippet grovelinefinder.cxx Interesting
    */
-  class GroveLineFinder {
+  class GroveLineFinder : virtual public iLineFinder {
   public:
     /**
      * Grove Line Finder digital sensor constructor
@@ -70,17 +71,15 @@ namespace upm {
      *
      * @return True if white is detected
      */
-    bool whiteDetected();
+    virtual bool whiteDetected();
     /**
      * Determines whether black has been detected
      *
      * @return True if black is detected
      */
-    bool blackDetected();
+    virtual bool blackDetected();
 
   private:
     mraa_gpio_context m_gpio;
   };
 }
-
-

src/gsr/gsr.cxx

@@ -65,3 +65,8 @@ int GSR::value()
     int val = mraa_aio_read(m_aio);
     return val;
 }
+
+float GSR::getECValue()
+{
+	return (float) GSR::value();
+}

src/gsr/gsr.hpp

@@ -25,6 +25,7 @@
 
 #include <string>
 #include <mraa/aio.h>
+#include <interfaces/iEC.hpp>
 
 namespace upm {
   /**
@@ -42,7 +43,7 @@ namespace upm {
    * @con analog
    *
    * @brief API for the Grove GSR Galvanic Skin Response Sensor
-   * 
+   *
    * Measures the electrical conductance of skin
    * to measure strong emotional reactions.
    * In other words, it measures sweat on your fingers
@@ -51,7 +52,7 @@ namespace upm {
    * @image html gsr.jpg
    * @snippet gsr.cxx Interesting
    */
-  class GSR {
+  class GSR : virtual public iEC {
   public:
     /**
      * Grove GSR sensor constructor
@@ -76,9 +77,14 @@ namespace upm {
      */
     int value();
 
+    /**
+     * Gets the electrical conductance of the skin from the sensor
+     *
+     * @return Electrical conductance of the skin
+     */
+    virtual float getECValue();
+
   private:
     mraa_aio_context m_aio;
   };
 }
-
-

src/linefinder/linefinder.hpp

@@ -24,6 +24,7 @@
 #pragma once
 
 #include <linefinder.h>
+#include <interfaces/iLineFinder.hpp>
 
 namespace upm {
     /**
@@ -51,7 +52,7 @@ namespace upm {
      * @image html linefinder.jpg
      * @snippet linefinder.cxx Interesting
      */
-    class LineFinder {
+    class LineFinder : virtual public iLineFinder {
     public:
         /**
          *  Line Finder digital sensor constructor
@@ -70,14 +71,14 @@ namespace upm {
          *
          * @return True if white is detected
          */
-        bool whiteDetected();
+        virtual bool whiteDetected();
 
         /**
          * Determines whether black has been detected
          *
          * @return True if black is detected
          */
-        bool blackDetected();
+        virtual bool blackDetected();
 
     private:
         /* Disable implicit copy and assignment operators */
@@ -87,5 +88,3 @@ namespace upm {
         linefinder_context m_linefinder;
     };
 }
-
-