boolean GrillPid::doWork(void)
{
unsigned int elapsed = millis() - _lastWorkMillis;
if (elapsed < (TEMP_MEASURE_PERIOD / TEMP_AVG_COUNT))
return false;
_lastWorkMillis = millis();
#if defined(GRILLPID_FAN_BOOST_ENABLED)
// If boost has been active for one period (TEMP_MEASURE_PERIOD / TEMP_AVG_COUNT
// milliseconds) disable it
if (_fanBoostActive)
{
// Really we just need to turn the OVF interupt back on but there's no
// function for that, so re-write the proper blower output
analogWrite(_fanPin, _lastBlowerOutput);
_fanBoostActive = false;
}
#endif
#if defined(GRILLPID_CALC_TEMP)
for (unsigned char i=0; i<TEMP_COUNT; i++)
if (Probes[i]->getProbeType() == PROBETYPE_INTERNAL ||
Probes[i]->getProbeType() == PROBETYPE_TC_ANALOG)
Probes[i]->readTemp();
++_periodCounter;
if (_periodCounter < TEMP_AVG_COUNT)
return false;
_periodCounter = 0;
for (unsigned char i=0; i<TEMP_COUNT; i++)
Probes[i]->calcTemp();
if (!_manualOutputMode)
{
// Always calculate the output
// calcPidOutput() will bail if it isn't supposed to be in control
calcPidOutput();
int pitTemp = (int)Probes[TEMP_PIT]->Temperature;
if ((pitTemp >= _setPoint) &&
(_lidOpenDuration - LidOpenResumeCountdown > LIDOPEN_MIN_AUTORESUME))
{
// When we first achieve temperature, reduce any I sum we accumulated during startup
// If we actually neded that sum to achieve temperature we'll rebuild it, and it
// prevents bouncing around above the temperature when you first start up
if (!_pitTemperatureReached)
{
_pitTemperatureReached = true;
_pidCurrent[PIDI] *= 0.25f;
}
LidOpenResumeCountdown = 0;
}
else if (LidOpenResumeCountdown != 0)
{
LidOpenResumeCountdown = LidOpenResumeCountdown - (TEMP_MEASURE_PERIOD / 1000);
}
// If the pit temperature has been reached
// and if the pit temperature is [lidOpenOffset]% less that the setpoint
// and if the fan has been running less than 90% (more than 90% would indicate probable out of fuel)
// Note that the code assumes we're not currently counting down
else if (_pitTemperatureReached &&
(((_setPoint-pitTemp)*100/_setPoint) >= (int)LidOpenOffset) &&
((int)PidOutputAvg < 90))
{
resetLidOpenResumeCountdown();
}
} /* if !manualFanMode */
#endif
commitPidOutput();
return true;
}
boolean GrillPid::doWork(void)
{
unsigned long m = millis();
// If this is the first invocation, force an immediate read and temperature
// update to display a value as soon as possible after booting
unsigned int elapsed = m - _lastTempRead;
if (elapsed < (TEMP_MEASURE_PERIOD / TEMP_AVG_COUNT))
return false;
_lastTempRead = m;
for (unsigned char i=0; i<TEMP_COUNT; i++)
if (Probes[i]->getProbeType() == PROBETYPE_INTERNAL)
Probes[i]->readTemp();
++_periodCounter;
if (_periodCounter < TEMP_AVG_COUNT)
return false;
for (unsigned char i=0; i<TEMP_COUNT; i++)
Probes[i]->calcTemp();
if (!_manualOutputMode)
{
// Always calculate the output
// calcPidOutput() will bail if it isn't supposed to be in control
calcPidOutput();
int pitTemp = (int)Probes[TEMP_PIT]->Temperature;
if ((pitTemp >= _setPoint) &&
(_lidOpenDuration - LidOpenResumeCountdown > LIDOPEN_MIN_AUTORESUME))
{
// When we first achieve temperature, reset any P sum we accumulated during startup
// If we actually neded that sum to achieve temperature we'll rebuild it, and it
// prevents bouncing around above the temperature when you first start up
if (!_pitTemperatureReached)
{
_pitTemperatureReached = true;
_pidCurrent[PIDI] = 0.0f;
}
LidOpenResumeCountdown = 0;
}
else if (LidOpenResumeCountdown != 0)
{
LidOpenResumeCountdown = LidOpenResumeCountdown - (TEMP_MEASURE_PERIOD / 1000);
}
// If the pit temperature has been reached
// and if the pit temperature is [lidOpenOffset]% less that the setpoint
// and if the fan has been running less than 90% (more than 90% would indicate probable out of fuel)
// Note that the code assumes we're not currently counting down
else if (_pitTemperatureReached &&
(((_setPoint-pitTemp)*100/_setPoint) >= (int)LidOpenOffset) &&
((int)PidOutputAvg < 90))
{
resetLidOpenResumeCountdown();
}
} /* if !manualFanMode */
commitPidOutput();
_periodCounter = 0;
return true;
}
