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PT100
Commit cb2d89f8 authored by João Lino's avatar João Lino
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PT100.cpp
View file @ cb2d89f8
...@@ -8,29 +8,19 @@ ...@@ -8,29 +8,19 @@
PT100::PT100(char *name, PT100::PT100(char *name,
int OutputPin_SensorPower, int OutputPin_SensorPower,
int OutputPin_ThirdLinePower,
int InputPin_TemperatureReading, int InputPin_TemperatureReading,
int InputPin_ThirdLineReading,
int TimeBetweenReadings, int TimeBetweenReadings,
float ADCVmax, float ADCVmax,
float Vs, float Vs,
float R1, float R1) {
float R2,
float m,
float b) {
_name = name; _name = name;
_OutputPin_SensorPower = OutputPin_SensorPower; _OutputPin_SensorPower = OutputPin_SensorPower;
_OutputPin_ThirdLinePower = OutputPin_ThirdLinePower;
_InputPin_TemperatureReading = InputPin_TemperatureReading; _InputPin_TemperatureReading = InputPin_TemperatureReading;
_InputPin_ThirdLineReading = InputPin_ThirdLineReading;
_TimeBetweenReadings = TimeBetweenReadings; _TimeBetweenReadings = TimeBetweenReadings;
_ADCVmax = ADCVmax; _ADCVmax = ADCVmax;
_Vs = Vs; _Vs = Vs;
_R1 = R1; _R1 = R1;
_R2 = R2;
__m = m;
__b = b;
_temperatureAverage = 24.0; _temperatureAverage = 24.0;
_measuredTemperature = 24.0; _measuredTemperature = 24.0;
...@@ -39,15 +29,12 @@ PT100::PT100(char *name, ...@@ -39,15 +29,12 @@ PT100::PT100(char *name,
_VoutPreviousAnalogSample = -1.0; _VoutPreviousAnalogSample = -1.0;
_temperatureMeasurementsMarker = 0; _temperatureMeasurementsMarker = 0;
_rPT100MeasurementsMarker = 0; _rPT100MeasurementsMarker = 0;
_rLineMeasurementsMarker = 0;
_measuredTemperatureDeviation = 0.0; _measuredTemperatureDeviation = 0.0;
_sampleDeviation = 0.0; _sampleDeviation = 0.0;
analogReference(INTERNAL1V1); // EXTERNAL && INTERNAL2V56 && INTERNAL1V1 analogReference(INTERNAL1V1); // EXTERNAL && INTERNAL2V56 && INTERNAL1V1
pinMode(_OutputPin_SensorPower, OUTPUT); // setup temperature sensor input pin pinMode(_OutputPin_SensorPower, OUTPUT); // setup temperature sensor input pin
pinMode(_OutputPin_ThirdLinePower, OUTPUT); // setup temperature sensor input pin
digitalWrite(_OutputPin_SensorPower, LOW); // initialize sensor on digitalWrite(_OutputPin_SensorPower, LOW); // initialize sensor on
digitalWrite(_OutputPin_ThirdLinePower, LOW); // initialize sensor on
} }
void PT100::setPower(float ADCVmax, float Vs) { void PT100::setPower(float ADCVmax, float Vs) {
...@@ -57,120 +44,16 @@ void PT100::setPower(float ADCVmax, float Vs) { ...@@ -57,120 +44,16 @@ void PT100::setPower(float ADCVmax, float Vs) {
void PT100::safeHardwarePowerOff() { void PT100::safeHardwarePowerOff() {
digitalWrite(_OutputPin_SensorPower, LOW); // Turn temperature sensor OFF for safety digitalWrite(_OutputPin_SensorPower, LOW); // Turn temperature sensor OFF for safety
digitalWrite(_OutputPin_ThirdLinePower, LOW); // Turn temperature sensor OFF for safety
} }
void PT100::measure(boolean ln) { void PT100::measure(boolean ln) {
if(millis() - _lastTemperatureRead >= _TimeBetweenReadings) { //time to measure temperature
/** measure Vout analog sample */
_VoutPreviousAnalogSample = _VoutAnalogSample; // Store previous
//digitalWrite(_OutputPin_SensorPower, HIGH); // Turn on sensor
//delay(10);
_VoutAnalogSample = analogRead(_InputPin_TemperatureReading); // Get a reading
//float test = analogRead(A7);
//digitalWrite(_OutputPin_SensorPower, LOW); // Turn off sensor
_lastTemperatureRead = millis(); // Mark time of temperature reading
/** Calculate temperature value */
float Vout = (_VoutAnalogSample + _VoutPreviousAnalogSample) / 2 * _ADCVmax / CONSTANT_ADC_STEP_COUNT;
//float Rtest = 608 / ( _Vs / (test * _ADCVmax / CONSTANT_ADC_STEP_COUNT) - 1.0);
float Rx = _R1 / ( _Vs / Vout - 1.0);// - Rtest;
float measuredTemperatureNow = 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));
float temperatureDiff = measuredTemperatureNow - _temperatureAverage; // Calculate deviation between temperature reading and average temperature
_temperatureMeasurementsMarker++; // Position reading buffer marker at the last updated position
if(_temperatureMeasurementsMarker >= TEMPERATURE_AVERAGE_VALUE_I) _temperatureMeasurementsMarker = 0; // Check that it has not gone out of the buffer range
if( _temperatureMeasurements[_temperatureMeasurementsMarker] == 0.0 ) {
// First Run
if ( measuredTemperatureNow > 12.0 ) {
// First Run with good data
_temperatureMeasurements[_temperatureMeasurementsMarker] = measuredTemperatureNow;
}
return;
}
/*
if(temperatureDiff > 5 || temperatureDiff < 5) {
_temperatureMeasurements[_temperatureMeasurementsMarker] = measuredTemperatureNow; // Write the average temp + one third of the measured temperature deviation
}
else {
_temperatureMeasurements[_temperatureMeasurementsMarker] = _temperatureAverage + (temperatureDiff / 3.0); // Write the average temp + one third of the measured temperature deviation
}
*/
//_temperatureMeasurements[_temperatureMeasurementsMarker] = measuredTemperatureNow;
_temperatureMeasurements[_temperatureMeasurementsMarker] = _temperatureAverage + (temperatureDiff / 3.0); // Write the average temp + one third of the measured temperature deviation
_temperatureAverage = 0.0; // Zero out the average, it is time to calculate the new one
for(int markerCounter = 0; markerCounter < TEMPERATURE_AVERAGE_VALUE_I; markerCounter++) { // Iterate over the temperature values in the buffer
_temperatureAverage += _temperatureMeasurements[markerCounter]; // Sum all the temperature values
}
_temperatureAverage = _temperatureAverage / TEMPERATURE_AVERAGE_VALUE_F; // Divide the sum by the number of values summed.
_measuredTemperature = _temperatureAverage; // Set the measured temperature to the calculated average value
xFilterNoise(_temperatureMeasurementsMarker);
/*
Serial.print("PT100 : [");
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("PT100 : [");
#ifdef DEBUG
Serial.print(_name);
Serial.print(",");
Serial.print(_VoutAnalogSample);
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
}
}
void PT100::measure1(boolean ln, boolean rline) {
if(millis() - _lastTemperatureRead >= _TimeBetweenReadings) { //time to measure temperature if(millis() - _lastTemperatureRead >= _TimeBetweenReadings) { //time to measure temperature
/** measure Vout analog sample */ /** measure Vout analog sample */
digitalWrite(_OutputPin_SensorPower, HIGH); // initialize sensor on digitalWrite(_OutputPin_SensorPower, HIGH); // initialize sensor on
digitalWrite(_OutputPin_ThirdLinePower, HIGH); // initialize sensor on
delay(10); delay(10);
_VoutAnalogSample = analogRead(_InputPin_TemperatureReading) + _sampleDeviation; // Get a reading _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_SensorPower, LOW); // initialize sensor on
digitalWrite(_OutputPin_ThirdLinePower, LOW); // initialize sensor on
_lastTemperatureRead = millis(); // Mark time of temperature reading _lastTemperatureRead = millis(); // Mark time of temperature reading
...@@ -180,67 +63,16 @@ void PT100::measure1(boolean ln, boolean rline) { ...@@ -180,67 +63,16 @@ void PT100::measure1(boolean ln, boolean rline) {
float Vout = GetMedian(_rPT100Measurements) * _ADCVmax / CONSTANT_ADC_STEP_COUNT; float Vout = GetMedian(_rPT100Measurements) * _ADCVmax / CONSTANT_ADC_STEP_COUNT;
float Rx = _R1 / ( _Vs / Vout - 1.0); 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 */ /** 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)); _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("PT100 : [");
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("PT100 : [");
#ifdef DEBUG #ifdef DEBUG
Serial.print(_name); Serial.print(_name);
Serial.print(","); Serial.print(",");
Serial.print(_VoutAnalogSample); //Serial.print(_VoutAnalogSample);
Serial.print(GetMedian(_rPT100Measurements));
Serial.print(","); 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(""); if(ln) Serial.println("");
#endif #endif
} }
...@@ -298,49 +130,9 @@ float PT100::GetMode(float new_array[]) { ...@@ -298,49 +130,9 @@ float PT100::GetMode(float new_array[]) {
return new_array[iMaxRepeat]; return new_array[iMaxRepeat];
} }
/*
void PT100::mean(int new_array[], int num){
//GET TOTAL & CALCULATE MEAN
float total;
for(int i=0;i<num; i++){
total += new_array[i];
}
cout << "The mean is " << total/num << endl;
mode(new_array, num);
}
void PT100::median(int new_array[], int num){
//CALCULATE THE MEDIAN (middle number)
if(num % 2 != 0){// is the # of elements odd?
int temp = ((num+1)/2)-1;
cout << "The median is " << new_array[temp] << endl;
}
else{// then it's even! :)
cout << "The median is "<< new_array[(num/2)-1] << " and " << new_array[num/2] << endl;
}
mean(new_array, num);
}*/
void PT100::xFilterNoise( int position ) {
for( int i = 0; i < 10 ; i++ ) {
int first = (position - 2 - i < 0)?(position - 2 - i + TEMPERATURE_AVERAGE_VALUE_I):(position - 2 - i);
int second = (position - 1 - i < 0)?(position - 1 - i + TEMPERATURE_AVERAGE_VALUE_I):(position - 1 - i);
int third = (position - i < 0)?(position - i + TEMPERATURE_AVERAGE_VALUE_I):(position - i);
if(
( ( _temperatureMeasurements[second] > _temperatureMeasurements[first] ) && ( _temperatureMeasurements[second] > _temperatureMeasurements[third] ) )
||
( ( _temperatureMeasurements[second] < _temperatureMeasurements[first] ) && ( _temperatureMeasurements[second] < _temperatureMeasurements[third] ) )
)
{
_temperatureMeasurements[second] = ( _temperatureMeasurements[first] + _temperatureMeasurements[third] ) / 2;
}
}
}
float PT100::getCurrentTemperature() { float PT100::getCurrentTemperature() {
float y = __m * _measuredTemperature + __b; return _measuredTemperature + _measuredTemperatureDeviation; // - 4.41;
return _measuredTemperature + y + _measuredTemperatureDeviation; // - 4.41;
} }
float PT100::getMeasuredTemperatureDeviation() { float PT100::getMeasuredTemperatureDeviation() {
......
PT100.h
View file @ cb2d89f8
...@@ -25,21 +25,15 @@ class PT100 ...@@ -25,21 +25,15 @@ class PT100
// PT100(PT100_OUTPUT_PIN, PT100_INPUT_PIN, PT100_TIME_BETWEEN_READINGS, PT100_DEFAULT_ADC_VMAX, PT100_DEFAULT_VS, PT100_DEFAULT_R1_RESISTENCE, PT100_DEFAULT_LINE_RESISTENCE, PT100_DEFAULT_OPERATION_RESISTENCE); // PT100(PT100_OUTPUT_PIN, PT100_INPUT_PIN, PT100_TIME_BETWEEN_READINGS, PT100_DEFAULT_ADC_VMAX, PT100_DEFAULT_VS, PT100_DEFAULT_R1_RESISTENCE, PT100_DEFAULT_LINE_RESISTENCE, PT100_DEFAULT_OPERATION_RESISTENCE);
PT100(char *name, PT100(char *name,
int OutputPin_SensorPower, int OutputPin_SensorPower,
int OutputPin_ThirdLinePower,
int InputPin_TemperatureReading, int InputPin_TemperatureReading,
int InputPin_ThirdLineReading,
int TimeBetweenReadings = 100, int TimeBetweenReadings = 100,
float ADCVmax = 1.081, float ADCVmax = 1.081,
float Vs = 4.87, float Vs = 4.87,
float R1 = 606.0, float R1 = 606.0);
float R2 = 606.0,
float m = 1.0,
float b = 0.0);
void setPower(float ADCVmax = 1.081, float Vs = 4.87); void setPower(float ADCVmax = 1.081, float Vs = 4.87);
void measure(boolean ln); void measure(boolean ln);
void measure1(boolean ln, boolean rline);
void safeHardwarePowerOff(); void safeHardwarePowerOff();
float getCurrentTemperature(); float getCurrentTemperature();
...@@ -52,16 +46,11 @@ class PT100 ...@@ -52,16 +46,11 @@ class PT100
private: private:
char *_name; char *_name;
int _OutputPin_SensorPower; int _OutputPin_SensorPower;
int _OutputPin_ThirdLinePower;
int _InputPin_TemperatureReading; int _InputPin_TemperatureReading;
int _InputPin_ThirdLineReading;
int _TimeBetweenReadings; int _TimeBetweenReadings;
float _ADCVmax; float _ADCVmax;
float _Vs; float _Vs;
float _R1; float _R1;
float _R2;
float __m;
float __b;
float _temperatureAverage; float _temperatureAverage;
float _measuredTemperature; float _measuredTemperature;
...@@ -73,12 +62,9 @@ class PT100 ...@@ -73,12 +62,9 @@ class PT100
float _VoutPreviousAnalogSample; float _VoutPreviousAnalogSample;
int _temperatureMeasurementsMarker; int _temperatureMeasurementsMarker;
int _rPT100MeasurementsMarker; int _rPT100MeasurementsMarker;
int _rLineMeasurementsMarker;
float _temperatureMeasurements[TEMPERATURE_AVERAGE_VALUE_I] = {TEMPERATURE_AVERATE_INIT_VALUES}; float _temperatureMeasurements[TEMPERATURE_AVERAGE_VALUE_I] = {TEMPERATURE_AVERATE_INIT_VALUES};
int _rPT100Measurements[TEMPERATURE_AVERAGE_VALUE_I] = {TEMPERATURE_AVERATE_INIT_VALUES_I}; int _rPT100Measurements[TEMPERATURE_AVERAGE_VALUE_I] = {TEMPERATURE_AVERATE_INIT_VALUES_I};
int _rLineMeasurements[TEMPERATURE_AVERAGE_VALUE_I] = {TEMPERATURE_AVERATE_INIT_VALUES_I};
void xFilterNoise( int position );
float GetMedian(int array[]); float GetMedian(int array[]);
float GetMode(float array[]); float GetMode(float array[]);
}; };
......
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