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Temperature.cpp
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Temperature.cpp
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/*
Temperature.cpp - Library for measuring temperature with a Temperature.
Created by João Lino, June 24, 2015.
Released into the public domain.
*/
#include "Arduino.h"
#include "Temperature.h"
Temperature::Temperature(const char *name,
int OutputPin_SensorPower,
int InputPin_TemperatureReading,
int TimeBetweenReadings,
float m1,
float m2,
float b1,
float b2) {
_name = name;
_OutputPin_SensorPower = OutputPin_SensorPower;
_InputPin_TemperatureReading = InputPin_TemperatureReading;
_TimeBetweenReadings = TimeBetweenReadings;
_m1 = m1;
_m2 = m2;
_b1 = b1;
_b2 = b2;
_temperatureAverage = 24.0;
_measuredTemperature = 24.0;
_lastTemperatureRead = 0;
_VoutAnalogSample = -1;
_VoutPreviousAnalogSample = -1.0;
_temperatureMeasurementsMarker = 0;
_rTemperatureMeasurementsMarker = 0;
_measuredTemperatureDeviation = 0.0;
_pump = false;
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
}
void Temperature::measure(boolean ln) {
if(millis() - _lastTemperatureRead >= _TimeBetweenReadings) { //time to measure temperature
/** measure Vout analog sample */
digitalWrite(_OutputPin_SensorPower, HIGH); // initialize sensor on
delay(10);
_VoutAnalogSample = analogRead(_InputPin_TemperatureReading); // Get a reading
digitalWrite(_OutputPin_SensorPower, 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;
//workingSample = GetMedianAverage(_rTemperatureMeasurements, 6);
float workingSample = GetMedian(_rTemperatureMeasurements);
/** Calculate temperature value */
if(_pump) {
_measuredTemperature = ( workingSample - _b1 ) / _m1;
} else {
_measuredTemperature = ( workingSample - _b2 ) / _m2;
}
#ifdef DEBUG
Serial.print(_name);
Serial.print(",");
//Serial.print(_VoutAnalogSample);
//Serial.print(workingSample);
Serial.print(_measuredTemperature);
//Serial.print(GetMedianAverage(_rTemperatureMeasurements, 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?
value = (float) sorted[((TEMPERATURE_AVERAGE_VALUE_I-1)/2) + 1];
}
else{// then it's even! :)
value = ((float) ( sorted[(TEMPERATURE_AVERAGE_VALUE_I/2)] + sorted[TEMPERATURE_AVERAGE_VALUE_I/2 + 1] )) / 2.0;
}
return value;
}
float Temperature::GetMedianAverage(int array[], int range) {
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;
}
int range_ = range;
if(range_ % 2 != 0) {// is the # of elements odd?
range_++;
}
int sum = 0;
for( int x = 0; x < range_; x++) {
sum += sorted[ (TEMPERATURE_AVERAGE_VALUE_I / 2 - range_ / 2 + x ) ];
}
value = ((float) (sum / range_));
return value;
}
float Temperature::GetMode(float new_array[]) {
int ipRepetition[TEMPERATURE_AVERAGE_VALUE_I];
for (int i = 0; i < TEMPERATURE_AVERAGE_VALUE_I; i++) {
ipRepetition[i] = 0;//initialize each element to 0
int j = 0;//
while ((j < i) && (new_array[i] != new_array[j])) {
if (new_array[i] != new_array[j]) {
j++;
}
}
(ipRepetition[j])++;
}
int iMaxRepeat = 0;
for (int i = 1; i < TEMPERATURE_AVERAGE_VALUE_I; i++) {
if (ipRepetition[i] > ipRepetition[iMaxRepeat]) {
iMaxRepeat = i;
}
}
return new_array[iMaxRepeat];
}
float Temperature::getCurrentTemperature() {
return _measuredTemperature>0.0?_measuredTemperature:0.0; // - 4.41;
}
float Temperature::setPumpStatus( bool pump ) {
_pump = pump;
return _pump;
}