SoilMoistureSensor.h

template < size_t iBUFFER_SIZE >
class SoilMoistureSensor
{   
  private:
    int m_aiSensorRawData[iBUFFER_SIZE];
    int m_iSensorPin;
    float m_fSensorValue;
    int m_bSensorHasValue;
    int m_iCurrentSamplingIndex;
    
  public:
    
    // Must set pin separately
    SoilMoistureSensor ()
    {
      m_iSensorPin = 0;
      m_fSensorValue = 0.0f; 
      m_bSensorHasValue = false; 
      
      m_iCurrentSamplingIndex = 0;
    }
    
    // Takes an analog input pin.
    SoilMoistureSensor (int iSensorPortNumber)
    {
      m_iSensorPin = iSensorPortNumber;
      m_fSensorValue = 0.0f; 
      m_bSensorHasValue = false; 
      
      m_iCurrentSamplingIndex = 0;
    }
    
    void SetPin(int iPin)
    {
      m_iSensorPin = iPin;
    }
    
    boolean DoesSensorHaveValue()
    {
      return m_bSensorHasValue;
    }
    
    void Sample()
    {
      m_aiSensorRawData[m_iCurrentSamplingIndex] = analogRead(m_iSensorPin);
      m_iCurrentSamplingIndex++;
      
      if (m_iCurrentSamplingIndex == iBUFFER_SIZE)
      {
        m_fSensorValue = 0;
        for (int i = 0; i < iBUFFER_SIZE; i++)
        {
          m_fSensorValue += m_aiSensorRawData[i];
        }
        m_fSensorValue /= iBUFFER_SIZE;
        m_bSensorHasValue = true;
      }
      
      m_iCurrentSamplingIndex %= iBUFFER_SIZE;
   }
   
   float GetValue()
   {
     return m_fSensorValue;
   }
   
   int GetIntValue()
   {
     return m_fSensorValue; 
   }

   float GetNormalisedValue(float fScale = 1024.0f)
   {
     return m_fSensorValue/fScale;
   }
   
   void ClearStoredValue()
   {
     m_bSensorHasValue = false;
     m_fSensorValue = 0.0f;
     m_iCurrentSamplingIndex = 0;
   }
};