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Added function to turn a fan on and off to keep heat from the hotend to rise up into the extruder.

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This commit is contained in:
blddk 2012-05-24 21:13:49 +03:00
parent 344235701b
commit b76a110336
1 changed files with 29 additions and 0 deletions
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29
Sprinter/heater.cpp
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@ -32,6 +32,10 @@
void controllerFan(void);
#endif
#ifdef EXTRUDERFAN_PIN
void extruderFan(void);
#endif
// Manage heater variables. For a thermistor or AD595 thermocouple, raw values refer to the
// reading from the analog pin. For a MAX6675 thermocouple, the raw value is the temperature in 0.25
// degree increments (i.e. 100=25 deg).
@ -734,6 +738,10 @@ void PID_autotune(int PIDAT_test_temp)
controllerFan(); //Check if fan should be turned on to cool stepper drivers down
#endif
#ifdef EXTRUDERFAN_PIN
extruderFan(); //Check if fan should be turned on to cool extruder down
#endif
}
#if defined (HEATER_USES_THERMISTOR) || defined (BED_USES_THERMISTOR)
@ -844,3 +852,24 @@ void controllerFan()
}
#endif
#ifdef EXTRUDERFAN_PIN
unsigned long lastExtruderCheck = 0;
void extruderFan()
{
if ((millis() - lastExtruderCheck) >= 2500) //Not a time critical function, so we only check every 2500ms
{
lastExtruderCheck = millis();
if (analog2temp(current_raw) < EXTRUDERFAN_DEC)
{
WRITE(EXTRUDERFAN_PIN, LOW); //... turn the fan off
}
else
{
WRITE(EXTRUDERFAN_PIN, HIGH); //... turn the fan on
}
}
}
#endif