int main(void) {
const float freezingCelsius = 0;
const float boilingCelsius = 100;
puts("Freezing Point");
printf("Celsius: %f\n", freezingCelsius);
printf("Fahrenheit: %f\n", celsiusToFahrenheit(freezingCelsius));
printf("Kelvin: %f\n\n", celsiusToKelvin(freezingCelsius));
puts("Boiling Point");
printf("Celsius: %f\n", boilingCelsius);
printf("Fahrenheit: %f\n", celsiusToFahrenheit(boilingCelsius));
printf("Kelvin: %f\n", celsiusToKelvin(boilingCelsius));
return EXIT_SUCCESS;
}
/*---------------------------------------------------------------------------*/
float t100::getColdJunctionTemperature()
{
int16_t tmp16;
float temperature;
/* Convert raw data to celsius */
/* TODO: Add additional eq function */
tmp16 = (internalBuffer[5] << 8) | internalBuffer[6];
tmp16 = tmp16 >> 4;
temperature = tmp16 * 0.0625;
/* Return the temperature value in correct unit */
if(this->temperatureUnit == T100_CELCIUS)
{
return temperature;
}
else if(this->temperatureUnit == T100_KELVIN)
{
return celsiusToKelvin(temperature);
}
else if(this->temperatureUnit == T100_FAHRENHEIT)
{
return celsiusToFahreneit(temperature);
}
else
{
return 99999.0; /* error ... */
}
}
void getTemp() {
uint16_t last_sample = 0;
double this_temp;
double temp_avg;
uint16_t i;
temp_avg = 0.0;
for (i=0; i<500; i++) {
last_sample = adc_read();
this_temp = sampleToFahrenheit(last_sample);
temp_avg = temp_avg + this_temp/500.0;
}
double c = fahrenheitToCelsius(temp_avg);
double k = celsiusToKelvin(c);
// write message to LCD
lcd_init();
FILE lcd_stream = FDEV_SETUP_STREAM(lcd_putchar, 0, _FDEV_SETUP_WRITE);
lcd_home();
lcd_write_string(PSTR("ADC: "));
lcd_write_int16(last_sample);
lcd_write_string(PSTR(" of 1024 "));
lcd_line_two();
fprintf_P(&lcd_stream, PSTR("%.2f"), temp_avg);
lcd_write_data(0xdf);
lcd_write_string(PSTR("F"));
lcd_line_three();
fprintf_P(&lcd_stream, PSTR("%.2f"), c);
lcd_write_data(0xdf);
lcd_write_string(PSTR("C"));
lcd_line_four();
fprintf_P(&lcd_stream, PSTR("%.2f"), k);
lcd_write_data(0xdf);
lcd_write_string(PSTR("K"));
}
/*---------------------------------------------------------------------------*/
float t100::getThermocoupleTemperature()
{
float temperature;
int partialGroupCount;
float thermocouple_mv;
TCCOEF_TYPEDEF partialCoeff;
const TCCOEF_TYPEDEF* currentCoeffs;
/* Get the correct data coefficients */
/* NOTE: We expect a valid 'thermocoupleTypeInd' here. */
currentCoeffs = ThermoCoeffArray[this->thermocoupleTypeInd].coeff;
partialGroupCount = ThermoCoeffArray[this->thermocoupleTypeInd].partialCoeffCount;
/* Let's get the current thermocouple voltage */
thermocouple_mv = getAdcVoltage();
/* Let's check the boundaries of the current thermocouple data type */
if(thermocouple_mv < currentCoeffs[0].mV_LOW)
{
/* Our current TC voltage is lower than the lowest */
return T100_TEMP_MIN;
}
else if(thermocouple_mv > currentCoeffs[(partialGroupCount-1)].mV_HIGH)
{
/* Our current TC voltage is higher than the highest */
return T100_TEMP_MAX;
}
/* OK, we are in limits but which partial group should we use? */
for(int i=0; i<partialGroupCount; i++)
{
if((thermocouple_mv >= currentCoeffs[i].mV_LOW) && (thermocouple_mv <= currentCoeffs[i].mV_HIGH))
{
/* Store the final coeff we are going to use */
partialCoeff = currentCoeffs[i];
/* Break the loop */
i = 999;
}
}
/* Calculate the polynomial result */
temperature = getColdJunctionTemperature_celsius();
temperature += partialCoeff.coeff[0];
for(int i=1; i<10; i++)
{
temperature += partialCoeff.coeff[i] * pow(thermocouple_mv,i);
}
/* Convert the temperature if neccessary */
if(this->temperatureUnit == T100_KELVIN)
{
temperature = celsiusToKelvin(temperature);
}
else if(this->temperatureUnit == T100_FAHRENHEIT)
{
temperature = celsiusToFahreneit(temperature);
}
return temperature;
}
