Konstantin Chayka / Mbed 2 deprecated WeatherStation

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Dependencies:   RF24 USBDevice mbed

Thermistor.cpp@2:ad2653bcf93f, 2015-10-22 (annotated)

Committer:
pro100kot14
Date:
Thu Oct 22 20:31:06 2015 +0000
Revision:
2:ad2653bcf93f
Parent:
1:8766173d267f 
Added the class of information processing with photoresist with the interpretation of it as light levels.; Added lighting classification as enum Illumination; Fixed bug in calculation of the temperature read from thermistor.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pro100kot14 1:8766173d267f 1 #include "Thermistor.h"
pro100kot14 1:8766173d267f 2
pro100kot14 1:8766173d267f 3 Thermistor::Thermistor(AnalogIn inputChanel, double a, double b, double c):input(inputChanel), error(0){
pro100kot14 1:8766173d267f 4 this->a = a;
pro100kot14 1:8766173d267f 5 this->b = b;
pro100kot14 1:8766173d267f 6 this->c = c;
pro100kot14 1:8766173d267f 7 }
pro100kot14 1:8766173d267f 8
pro100kot14 1:8766173d267f 9 double Thermistor::getTemperature(){
pro100kot14 1:8766173d267f 10 double temp;
pro100kot14 1:8766173d267f 11 double realV;
pro100kot14 1:8766173d267f 12 double resistance;
pro100kot14 1:8766173d267f 13 //3.3 - ADC maximum
pro100kot14 1:8766173d267f 14 realV = input.read()*3.3;
pro100kot14 2:ad2653bcf93f 15 resistance = (10000 * 3.3) / realV - 10000;
pro100kot14 1:8766173d267f 16 //Considering the error
pro100kot14 1:8766173d267f 17 resistance -= error;
pro100kot14 1:8766173d267f 18 //Calculations using Steinhart–Hart equation
pro100kot14 1:8766173d267f 19 temp = log(resistance);
pro100kot14 1:8766173d267f 20 temp = 1/(a+b*temp+c*temp*temp*temp);
pro100kot14 1:8766173d267f 21 //Convert from Fahrenheit to Celsius
pro100kot14 1:8766173d267f 22 temp -= 273.15;
pro100kot14 1:8766173d267f 23 return temp;
pro100kot14 1:8766173d267f 24 }
pro100kot14 1:8766173d267f 25
pro100kot14 1:8766173d267f 26 void Thermistor::setError(double error){
pro100kot14 1:8766173d267f 27 this->error = error;
pro100kot14 1:8766173d267f 28 }
pro100kot14 1:8766173d267f 29
pro100kot14 1:8766173d267f 30 double Thermistor::getError(){
pro100kot14 1:8766173d267f 31 return error;
pro100kot14 1:8766173d267f 32 }
pro100kot14 1:8766173d267f 33
pro100kot14 1:8766173d267f 34 void Thermistor::setCoefficientA(double a){
pro100kot14 1:8766173d267f 35 this->a = a;
pro100kot14 1:8766173d267f 36 }
pro100kot14 1:8766173d267f 37
pro100kot14 1:8766173d267f 38 void Thermistor::setCoefficientB(double b){
pro100kot14 1:8766173d267f 39 this->b = b;
pro100kot14 1:8766173d267f 40 }
pro100kot14 1:8766173d267f 41
pro100kot14 1:8766173d267f 42 void Thermistor::setCoefficientC(double c){
pro100kot14 1:8766173d267f 43 this->c = c;
pro100kot14 1:8766173d267f 44 }
pro100kot14 1:8766173d267f 45
pro100kot14 1:8766173d267f 46 double Thermistor::getCoefficientA(){
pro100kot14 1:8766173d267f 47 return a;
pro100kot14 1:8766173d267f 48 }
pro100kot14 1:8766173d267f 49
pro100kot14 1:8766173d267f 50 double Thermistor::getCoefficientB(){
pro100kot14 1:8766173d267f 51 return b;
pro100kot14 1:8766173d267f 52 }
pro100kot14 1:8766173d267f 53
pro100kot14 1:8766173d267f 54 double Thermistor::getCoefficientC(){
pro100kot14 1:8766173d267f 55 return c;
pro100kot14 1:8766173d267f 56 }