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      1 /*
      2  * Author: Yevgeniy Kiveisha <yevgeniy.kiveisha (at) intel.com>
      3  * Copyright (c) 2014 Intel Corporation.
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining
      6  * a copy of this software and associated documentation files (the
      7  * "Software"), to deal in the Software without restriction, including
      8  * without limitation the rights to use, copy, modify, merge, publish,
      9  * distribute, sublicense, and/or sell copies of the Software, and to
     10  * permit persons to whom the Software is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be
     14  * included in all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 
     25 #include <iostream>
     26 #include <unistd.h>
     27 #include <stdlib.h>
     28 #include <string>
     29 #include <stdexcept>
     30 
     31 #include "ecs1030.h"
     32 
     33 using namespace upm;
     34 
     35 ECS1030::ECS1030 (uint8_t pinNumber) {
     36     m_dataPinCtx = mraa_aio_init(pinNumber);
     37     if (m_dataPinCtx == NULL) {
     38       throw std::invalid_argument(std::string(__FUNCTION__) +
     39                                   ": mraa_aio_init() failed");
     40     }
     41 
     42     m_calibration = 111.1;
     43 }
     44 
     45 ECS1030::~ECS1030 () {
     46     mraa_result_t error = MRAA_SUCCESS;
     47 
     48     error = mraa_aio_close (m_dataPinCtx);
     49     if (error != MRAA_SUCCESS) {
     50     }
     51 }
     52 
     53 double
     54 ECS1030::getCurrency_A () {
     55     int     sensorValue  = 0;
     56     float   rLoad        = 0;
     57     float   volt         = 0;
     58     float   rms          = 0;
     59 
     60     for (int i = 0; i < NUMBER_OF_SAMPLES; i++) {
     61         sensorValue = mraa_aio_read (m_dataPinCtx);
     62         volt = (VOLT_M * sensorValue) - 2.5;
     63         volt = volt * volt;
     64         rms = rms + volt;
     65         usleep (DELAY_MS);
     66     }
     67 
     68     rms = rms / (float)NUMBER_OF_SAMPLES;
     69     rms = sqrt(rms);
     70     return rms / R_LOAD;
     71 }
     72 
     73 double
     74 ECS1030::getCurrency_B () {
     75     double sumCurrency    = 0;
     76 
     77     for (int i = 0; i < NUMBER_OF_SAMPLES; i++) {
     78         m_lastSample = m_sample;
     79         m_sample = mraa_aio_read (m_dataPinCtx);
     80         m_lastFilter = m_filteredSample;
     81         m_filteredSample = 0.996 * (m_lastFilter + m_sample - m_lastSample);
     82         sumCurrency += (m_filteredSample * m_filteredSample);
     83     }
     84 
     85     double ratio = m_calibration * ((SUPPLYVOLTAGE / 1000.0) / (ADC_RESOLUTION));
     86     return ( ratio * sqrt(sumCurrency / NUMBER_OF_SAMPLES) );
     87 }
     88 
     89 double
     90 ECS1030::getPower_A () {
     91     return 220.0 * getCurrency_A ();
     92 }
     93 
     94 double
     95 ECS1030::getPower_B () {
     96     return 220.0 * getCurrency_B ();
     97 }
     98