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();
}
inline void GrillPid::commitPidOutput(void)
{
calcExpMovingAverage(PIDOUTPUT_AVG_SMOOTH, &PidOutputAvg, _pidOutput);
commitFanOutput();
commitServoOutput();
}
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();
}
inline void GrillPid::commitFanSpeed(void)
{
/* Long PWM period is 10 sec */
const unsigned int LONG_PWM_PERIOD = 10000;
const unsigned int PERIOD_SCALE = (LONG_PWM_PERIOD / TEMP_MEASURE_PERIOD);
calcExpMovingAverage(FANSPEED_AVG_SMOOTH, &FanSpeedAvg, _fanSpeed);
if (_outputDevice == PIDOUTPUT_Fan)
{
/* For anything above _minFanSpeed, do a nomal PWM write.
For below _minFanSpeed we use a "long pulse PWM", where
the pulse is 10 seconds in length. For each percent we are
emulating, run the fan for one interval. */
unsigned char output;
if (_fanSpeed >= _minFanSpeed)
{
output = _fanSpeed;
_longPwmTmr = 0;
}
else
{
// Simple PWM, ON for first [FanSpeed] intervals then OFF
// for the remainder of the period
if (((PERIOD_SCALE * _fanSpeed / _minFanSpeed) > _longPwmTmr))
output = _minFanSpeed;
else
output = 0;
if (++_longPwmTmr > (PERIOD_SCALE - 1))
_longPwmTmr = 0;
} /* long PWM */
if (_invertPwm)
output = _maxFanSpeed - output;
OCR1B = (unsigned int)output * 512 / 100;
}
else
{
// GrillPidOutput::Servo
unsigned char output;
if (_invertPwm)
output = 100 - _fanSpeed;
else
output = _fanSpeed;
// Get the output speed in 10x usec by LERPing between min and max
output = ((_maxFanSpeed - _minFanSpeed) * (unsigned int)output / 100) + _minFanSpeed;
OCR1B = uSecToTicks(10U * output);
}
#if defined(TIMER1_DEBUG)
SerialX.print("HMLG,0,");
SerialX.print(" ICR1="); SerialX.print(ICR1, DEC);
SerialX.print(" OCR1B="); SerialX.print(OCR1B, DEC);
SerialX.print(" TCCR1A=x"); SerialX.print(TCCR1A, HEX);
SerialX.print(" TCCR1B=x"); SerialX.print(TCCR1B, HEX);
SerialX.print(" TCCR1C=x"); SerialX.print(TCCR1C, HEX);
SerialX.print(" TIMSK1=x"); SerialX.print(TIMSK1, HEX);
if (ovf) { ovf = false; SerialX.print(" ovf"); }
if (rst) { SerialX.print(' '); SerialX.print(rst, DEC); rst = 0; }
if (bit_is_set(TIFR1, TOV1)) { SerialX.print(" TOV1"); TIFR1 = bit(TOV1); }
SerialX.nl();
#endif
}
