File content as of revision 1:f448c12d2c5b:

/*
* G3: WATERPLAY
*/

#include "TemperatureSensor.h"
#include "mbed.h"

TemperatureSensor::TemperatureSensor(
    mbed::Serial &serial,
    PinName pin,
    double const_voltage,
    double const_converter,
    double variance,
    double vin,
    double resistance
):
    _serial(serial),
    _analog_in(pin),
    _const_voltage(const_voltage),
    _const_converter(const_converter),
    _variance(variance),
    _vin(vin),
    _resistance(resistance),
    _temperature(0.0),
    _k0(0.00102119),
    _k1(0.000222468),
    _k2(0.000000133342),
    _kelvin_to_celcius(-273.15)
{
    read();
}

double TemperatureSensor::read()
{
    this->_reading = _analog_in.read();
    this->_voltage = this->_reading * _const_voltage;
    this->_voltage = this->_reading * _const_voltage;
    double RT = (this->_voltage * _resistance) / (_vin - this->_voltage);
    double logRT = log(RT);
    double K0 = this->_k0;
    double K1 = this->_k1 * logRT;
    double K2 = this->_k2 * pow(logRT, 3.0);
    double kelvin = 1.0 / (K0 + K1 + K2);
    this->_temperature = (kelvin + this->_kelvin_to_celcius) + this->_variance;
    
    /*
    _serial.printf(
        "\ttemperature: %5.4F | %5.4F | %5.4F\n\r",
        this->_reading,
        this->_voltage,
        this->_temperature
    );
    */

    return(this->_reading);
}

double TemperatureSensor::getVoltage()
{
    return(this->_voltage);
}

double TemperatureSensor::getTemperature()
{
    return(this->_temperature);
}