Temperature.cpp.sketch

/*
  Temperature.cpp - Library for measuring temperature with a Temperature.
  Created by João Lino, December 22, 2015.
  Released into the public domain.
*/
#include "Arduino.h"
#include "Temperature.h"

Temperature::Temperature(char *name,
                    int OutputPin_SensorPower, 
                    int InputPin_TemperatureReading, 
					int TimeBetweenReadings) {
	
    _name                              =   name;
    _OutputPin_SensorPower             =   OutputPin_SensorPower;
    _InputPin_TemperatureReading       =   InputPin_TemperatureReading;
	_TimeBetweenReadings               =   TimeBetweenReadings;
	_ADCVmax                           =   ADCVmax;
	
	_temperatureAverage	               =   24.0;
	_measuredTemperature               =   24.0;
	_lastTemperatureRead               =   0;
	_VoutAnalogSample                  =   -1;
	_VoutPreviousAnalogSample          =   -1.0;
	_temperatureMeasurementsMarker     =   0;
    _rTemperatureMeasurementsMarker    =   0;
    _rLineMeasurementsMarker           =   0;
    _measuredTemperatureDeviation      =   0.0;
    _sampleDeviation                   =   0.0;

    analogReference(INTERNAL1V1);									// EXTERNAL && INTERNAL2V56 && INTERNAL1V1
    pinMode(_OutputPin_SensorPower, OUTPUT);            // setup temperature sensor input pin
    digitalWrite(_OutputPin_SensorPower, LOW);      // initialize sensor on
}

void Temperature::safeHardwarePowerOff() {
  digitalWrite(_OutputPin_SensorPower, LOW);        // Turn temperature sensor OFF for safety
  digitalWrite(_OutputPin_ThirdLinePower, LOW);        // Turn temperature sensor OFF for safety
}

void Temperature::measure1(boolean ln, boolean rline) {
  if(millis() - _lastTemperatureRead >= _TimeBetweenReadings) {                           //time to measure temperature
    
    /** measure Vout analog sample */
    digitalWrite(_OutputPin_SensorPower, HIGH);      // initialize sensor on
    digitalWrite(_OutputPin_ThirdLinePower, HIGH);      // initialize sensor on
    delay(10);
    _VoutAnalogSample = analogRead(_InputPin_TemperatureReading) + _sampleDeviation;     // Get a reading
    _VoutRAnalogSample = analogRead(_InputPin_ThirdLineReading) + _sampleDeviation;     // Get a reading
    digitalWrite(_OutputPin_SensorPower, LOW);      // initialize sensor on
    digitalWrite(_OutputPin_ThirdLinePower, LOW);      // initialize sensor on

    _lastTemperatureRead            = millis();                                             // Mark time of temperature reading

    _rTemperatureMeasurementsMarker++;                                                                                                                                                   // Position reading buffer marker at the last updated position
    if(_rTemperatureMeasurementsMarker >= TEMPERATURE_AVERAGE_VALUE_I) _rTemperatureMeasurementsMarker = 0;           // Check that it has not gone out of the buffer range
    _rTemperatureMeasurements[_rTemperatureMeasurementsMarker] = _VoutAnalogSample;
    float Vout = GetMedian(_rTemperatureMeasurements) * _ADCVmax / CONSTANT_ADC_STEP_COUNT;
    float Rx = _R1 / ( _Vs / Vout - 1.0);

    if(rline) {
        _rLineMeasurementsMarker++;                                                                                                                                                   // Position reading buffer marker at the last updated position
        if(_rLineMeasurementsMarker >= TEMPERATURE_AVERAGE_VALUE_I) _rLineMeasurementsMarker = 0;           // Check that it has not gone out of the buffer range
        _rLineMeasurements[_rLineMeasurementsMarker] = _VoutRAnalogSample;

        /** Calculate temperature value */
        float VoutR = GetMedian(_rLineMeasurements) * _ADCVmax / CONSTANT_ADC_STEP_COUNT;
        float Rline = _R2 / ( _Vs / VoutR - 1.0);
        _measuredTemperature = 1.08271 * pow(10.0, -13.0) * (3.12508 * pow(10.0, 16.0) - 5.65566 * pow(10.0, 6.0) * sqrt(3.51501 * pow(10.0, 19.0) - 4.61805 * pow(10.0, 16.0) * (Rx - Rline)));
    }
    else {
        /** Calculate temperature value */
        _measuredTemperature = 1.08271 * pow(10.0, -13.0) * (3.12508 * pow(10.0, 16.0) - 5.65566 * pow(10.0, 6.0) * sqrt(3.51501 * pow(10.0, 19.0) - 4.61805 * pow(10.0, 16.0) * Rx));
    }
    

    //xFilterNoise(_temperatureMeasurementsMarker);
/*
    Serial.print("Temperature : [");
    Serial.print(_name);
    Serial.print("]\tVoutSample: [");
    Serial.print(_VoutAnalogSample);


//    Serial.print("]\tVout[");
//    Serial.print(Vout,6);
//    Serial.print("]\tRx[");
//    Serial.print(Rx,6);

    
    Serial.print("]\tTNow[");
    Serial.print(measuredTemperatureNow,6);
    Serial.print("]\tTCalc[");
    Serial.print(_measuredTemperature,6);
    Serial.println("] ");
*/


    //Serial.print("Temperature : [");
    #ifdef DEBUG
    Serial.print(_name);
    Serial.print(",");
    Serial.print(_VoutAnalogSample);
    Serial.print(",");
    //Serial.print(_VoutRAnalogSample);
    //Serial.print(",");

    /*Serial.print(test);
    Serial.print(",");
    Serial.print(Rtest);
    Serial.print(",");*/
    /*Serial.print(Vout,6);
    Serial.print(",");
    Serial.print(Rx,6);

    
    Serial.print(",");
    Serial.print(measuredTemperatureNow,6);
    Serial.print(",");
    Serial.print(_measuredTemperature,6);
    Serial.print(",");*/
    if(ln) Serial.println("");
    #endif
  }
}

float Temperature::GetMedian(int array[]){
    int sorted[TEMPERATURE_AVERAGE_VALUE_I];
    float value = 0.0;

    for(int x = 0; x < TEMPERATURE_AVERAGE_VALUE_I; x++) {
        sorted[x] = array[x];
    }

     //ARRANGE VALUES
    for(int x = 0; x < TEMPERATURE_AVERAGE_VALUE_I; x++){
        for(int y = 0; y < TEMPERATURE_AVERAGE_VALUE_I - 1; y++){
            if(sorted[y]>sorted[y+1]){
                int temp = sorted[y+1];
                sorted[y+1] = sorted[y];
                sorted[y] = temp;
            }
        }
    }

    //CALCULATE THE MEDIAN (middle number)
    if(TEMPERATURE_AVERAGE_VALUE_I % 2 != 0){// is the # of elements odd?
        int temp = ((TEMPERATURE_AVERAGE_VALUE_I+1)/2)-1;
        value = (float) sorted[temp];
    }
    else{// then it's even! :)
        value = ((float) ( sorted[(TEMPERATURE_AVERAGE_VALUE_I/2)-1] + sorted[TEMPERATURE_AVERAGE_VALUE_I/2] )) / 2.0;
    }

    return value;
}

float Temperature::getCurrentTemperature() {
    return _measuredTemperature + _measuredTemperatureDeviation;
}

float Temperature::getMeasuredTemperatureDeviation() {
    return _measuredTemperatureDeviation;
}
float Temperature::setMeasuredTemperatureDeviation( float measuredTemperatureDeviation) {
    if( _measuredTemperatureDeviation != measuredTemperatureDeviation ) {
        _measuredTemperatureDeviation = measuredTemperatureDeviation;

        for( int i = 0; i < TEMPERATURE_AVERAGE_VALUE_I; i++ ) {
            _temperatureMeasurements[i] = _temperatureMeasurements[i] + ( _measuredTemperatureDeviation * -1 );
        }
    }
    
    return _measuredTemperatureDeviation;
}

float Temperature::setSampleDeviation( float sampleDeviation) {
    _sampleDeviation = sampleDeviation;

    return _sampleDeviation;
}