EmonLib.h

/*
  Emon.h - Library for openenergymonitor
  Created by Trystan Lea, April 27 2010
  GNU GPL
  modified to use up to 12 bits ADC resolution (ex. Arduino Due)
  by boredman@boredomprojects.net 26.12.2013
*/

#ifndef EmonLib_h
#define EmonLib_h

#if defined(ARDUINO) && ARDUINO >= 100

#include "Arduino.h"

#else

#include "WProgram.h"

#endif

// to enable 12-bit ADC resolution on Arduino Due, 
// include the following line in main sketch inside setup() function:
//  analogReadResolution(ADC_BITS);
// otherwise will default to 10 bits, as in regular Arduino-based boards.
#if defined(__arm__)
#define ADC_BITS    12
#else
#define ADC_BITS    10
#endif

#define ADC_COUNTS  (1<<ADC_BITS)


class EnergyMonitor
{
  public:

    void voltage(int _inPinV, double _VCAL, double _PHASECAL);
    void current(int _inPinI, double _ICAL);

    void voltageTX(double _VCAL, double _PHASECAL);
    void currentTX(int _channel, double _ICAL);

    void calcVI(int crossings, int timeout);
    double calcIrms(int NUMBER_OF_SAMPLES);
    void serialprint();

    long readVcc();
    //Useful value variables
    double realPower,
       apparentPower,
       powerFactor,
       Vrms,
       Irms;

  private:

    //Set Voltage and current input pins
    int inPinV;
    int inPinI;
    //Calibration coeficients
    //These need to be set in order to obtain accurate results
    double VCAL;
    double ICAL;
    double PHASECAL;

    //--------------------------------------------------------------------------------------
    // Variable declaration for emon_calc procedure
    //--------------------------------------------------------------------------------------
	int lastSampleV,sampleV;   //sample_ holds the raw analog read value, lastSample_ holds the last sample
	int lastSampleI,sampleI;                      

	double lastFilteredV,filteredV;                   //Filtered_ is the raw analog value minus the DC offset
	double lastFilteredI, filteredI;                  

	double phaseShiftedV;                             //Holds the calibrated phase shifted voltage.

	double sqV,sumV,sqI,sumI,instP,sumP;              //sq = squared, sum = Sum, inst = instantaneous

	int startV;                                       //Instantaneous voltage at start of sample window.

	boolean lastVCross, checkVCross;                  //Used to measure number of times threshold is crossed.
	int crossCount;                                   // ''


};

#endif