void TempProbe::calcTemp(void)
{
const float ADCmax = (1 << (10+TEMP_OVERSAMPLE_BITS)) - 1;
if (_accumulatedCount != 0)
{
unsigned int ADCval = _accumulator / _accumulatedCount;
_accumulatedCount = 0;
// Units 'A' = ADC value
if (pid.getUnits() == 'A')
{
Temperature = ADCval;
return;
}
if (ADCval != 0) // Vout >= MAX is reduced in readTemp()
{
float R, T;
// If you put the fixed resistor on the Vcc side of the thermistor, use the following
R = Steinhart[3] / ((ADCmax / (float)ADCval) - 1.0f);
// If you put the thermistor on the Vcc side of the fixed resistor use the following
//R = Steinhart[3] * ADCmax / (float)Vout - Steinhart[3];
// Units 'R' = resistance, unless this is the pit probe (which should spit out Celsius)
if (pid.getUnits() == 'R' && this != pid.Probes[TEMP_PIT])
{
Temperature = R;
return;
};
// Compute degrees K
R = log(R);
T = 1.0f / ((Steinhart[2] * R * R + Steinhart[1]) * R + Steinhart[0]);
setTemperatureC(T - 273.15f);
} /* if ADCval */
else
Temperature = NAN;
} /* if accumulatedcount */
if (hasTemperature())
{
calcExpMovingAverage(TEMPPROBE_AVG_SMOOTH, &TemperatureAvg, Temperature);
Alarms.updateStatus(Temperature);
}
else
Alarms.silenceAll();
}
void TempProbe::calcTemp(void)
{
const float ADCmax = (1 << (10+TEMP_OVERSAMPLE_BITS)) - 1;
if (_accumulatedCount != 0)
{
unsigned int ADCval = _accumulator / _accumulatedCount;
_accumulatedCount = 0;
// Units 'A' = ADC value
if (pid.getUnits() == 'A')
{
Temperature = ADCval;
return;
}
if (ADCval != 0) // Vout >= MAX is reduced in readTemp()
{
if (_probeType == PROBETYPE_TC_ANALOG)
{
float mvScale = Steinhart[3];
// Commented out because there's no "divide by zero" exception so
// just allow undefined results to save prog space
//if (mvScale == 0.0f)
// mvScale = 1.0f;
// If scale is <100 it is assumed to be mV/C with a 3.3V reference
if (mvScale < 100.0f)
mvScale = 3300.0f / mvScale;
setTemperatureC(ADCval / ADCmax * mvScale);
}
else {
float R, T;
// If you put the fixed resistor on the Vcc side of the thermistor, use the following
R = Steinhart[3] / ((ADCmax / (float)ADCval) - 1.0f);
// If you put the thermistor on the Vcc side of the fixed resistor use the following
//R = Steinhart[3] * ADCmax / (float)Vout - Steinhart[3];
// Units 'R' = resistance, unless this is the pit probe (which should spit out Celsius)
if (pid.getUnits() == 'R' && this != pid.Probes[TEMP_PIT])
{
Temperature = R;
return;
};
// Compute degrees K
R = log(R);
T = 1.0f / ((Steinhart[2] * R * R + Steinhart[1]) * R + Steinhart[0]);
setTemperatureC(T - 273.15f);
} /* if PROBETYPE_INTERNAL */
} /* if ADCval */
else
Temperature = NAN;
} /* if accumulatedcount */
if (hasTemperature())
{
calcExpMovingAverage(TEMPPROBE_AVG_SMOOTH, &TemperatureAvg, Temperature);
Alarms.updateStatus(Temperature);
}
else
Alarms.silenceAll();
}
