Andrew's git - arduino-weather.git/blob - libraries/Mitov/Mitov

   1////////////////////////////////////////////////////////////////////////////////
   2//                                                                            //
   3//     This software is supplied under the terms of a license agreement or    //
   4//     nondisclosure agreement with Mitov Software and may not be copied      //
   5//     or disclosed except in accordance with the terms of that agreement.    //
   6//         Copyright(c) 2002-2016 Mitov Software. All Rights Reserved.        //
   7//                                                                            //
   8////////////////////////////////////////////////////////////////////////////////
   9
  10#ifndef _MITOV_HEAT_INDEDX_h
  11#define _MITOV_HEAT_INDEDX_h
  12
  13#include <Mitov.h>
  14
  15namespace Mitov
  16{
  17        class HeatIndex : public Mitov::CommonEnableSource
  18        {
  19                typedef Mitov::CommonEnableSource inherited;
  20
  21        public:
  22                OpenWire::SinkPin       TemperatureInputPin;
  23                OpenWire::SinkPin       HumidityInputPin;
  24
  25        public:
  26                float   InitialTemperature = 0.0f;
  27                float   InitialHumidity = 0.0f;
  28                bool    InFahrenheit = false;
  29
  30        protected:
  31                void DoTemperatureReceive( void *_Data )
  32                {
  33                        float AValue = *(float*)_Data;
  34                        if( InitialTemperature == AValue )
  35                                return;
  36
  37                        InitialTemperature = AValue;
  38                        CalculateOutput();
  39                }
  40
  41                void DoHumidityReceive( void *_Data )
  42                {
  43                        float AValue = *(float*)_Data;
  44                        if( InitialHumidity == AValue )
  45                                return;
  46
  47                        InitialHumidity = AValue;
  48                        CalculateOutput();
  49                }
  50
  51                void CalculateOutput()
  52                {
  53                        // Using both Rothfusz and Steadman's equations
  54                        // http://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml
  55
  56                        float temperature = InitialTemperature;
  57                        if ( ! InFahrenheit )
  58                                temperature = ConvertCtoF(temperature);
  59
  60                        float hi = 0.5 * (temperature + 61.0 + ((temperature - 68.0) * 1.2) + (InitialHumidity * 0.094));
  61
  62                        if( hi > 79 )
  63                        {
  64                                hi = -42.379 +
  65                                                         2.04901523 * temperature +
  66                                                        10.14333127 * InitialHumidity +
  67                                                        -0.22475541 * temperature * InitialHumidity +
  68                                                        -0.00683783 * pow(temperature, 2) +
  69                                                        -0.05481717 * pow(InitialHumidity, 2) +
  70                                                         0.00122874 * pow(temperature, 2) * InitialHumidity +
  71                                                         0.00085282 * temperature * pow(InitialHumidity, 2) +
  72                                                        -0.00000199 * pow(temperature, 2) * pow(InitialHumidity, 2);
  73
  74                                if((InitialHumidity < 13) && (temperature >= 80.0) && (temperature <= 112.0))
  75                                        hi -= ((13.0 - InitialHumidity) * 0.25) * sqrt((17.0 - abs(temperature - 95.0)) * 0.05882);
  76
  77                                else if((InitialHumidity > 85.0) && (temperature >= 80.0) && (temperature <= 87.0))
  78                                        hi += ((InitialHumidity - 85.0) * 0.1) * ((87.0 - temperature) * 0.2);
  79                        }
  80
  81                        if( ! InFahrenheit )
  82                                hi = ConvertFtoC( hi );
  83
  84                        inherited::OutputPin.Notify( &hi );
  85                }
  86
  87        protected:
  88                virtual void SystemStart() 
  89                {
  90                        inherited::SystemStart();
  91                        CalculateOutput();
  92                }
  93
  94        public:
  95                HeatIndex()
  96                {
  97                        TemperatureInputPin.SetCallback( this, (OpenWire::TOnPinReceive)&HeatIndex::DoTemperatureReceive );
  98                        HumidityInputPin.SetCallback( this, (OpenWire::TOnPinReceive)&HeatIndex::DoHumidityReceive );
  99                }
 100
 101        };
 102}
 103
 104#endif