File content as of revision 1:dc9389ccc09d:

#include "mbed.h"
#include "thermistor.h"

Thermistor::Thermistor(AnalogIn *aIn)
{
    _aIn = aIn;
}

double Thermistor::getTemperature()
{
    this->getResistance();
    if(this->_resistance > RES_25C){
        this->_temperature = (25.0 - ((this->_resistance - RES_25C) / RES_DIFF_PER_C));
    } else if(this->_resistance < RES_25C){
        this->_temperature = (25.0 + ((RES_25C - this->_resistance) / RES_DIFF_PER_C));
    } else {
        this->_temperature = 25.0;
    }
    printf("resistance : %f\n", _resistance);
    return this->_temperature;
}

void Thermistor::getResistance()
{
    double sum = 0.0;
    uint16_t adc_data[SAMPLE_COUNT], average;
    int i = 0;
    while(i < SAMPLE_COUNT) {
        adc_data[i] = ((_aIn->read_u16() >> 4) & 0x0FFF);
        sum += adc_data[i++];
    }
    average = sum / SAMPLE_COUNT;
    this->_resistance = (((BALANCE_RES_S * 0x0FFF) / average)) - BALANCE_RES_S;
}