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Implement automatic extruder/cold-end fan control based on temperature

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This change allows fan outputs to automatically turn on/off when the
associated nozzle temperature of an extruder is above/below a threshold
temperature.
Multiple extruders can be assigned to the same pin in which case the fan
will turn on when any selected extruder is above the threshold.
It also makes the M42 command compatible with the M106/M107 command.
The majority of the logic in this change will be evaluated by the
compiler at build time (i.e, low code space requirements).
This commit is contained in:
Robert F-C
2013-03-01 21:57:23 +11:00
parent 4eb81a69e6
commit 372e12f83f
4 changed files with 302 additions and 234 deletions
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54
Marlin/temperature.cpp
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@ -99,8 +99,9 @@ static volatile bool temp_meas_ready = false;
#ifdef FAN_SOFT_PWM
static unsigned char soft_pwm_fan;
#endif
#if EXTRUDER_0_AUTO_FAN_PIN > -1 || EXTRUDER_1_AUTO_FAN_PIN > -1 || EXTRUDER_2_AUTO_FAN_PIN > -1
static uint8_t extruderAutoFanState = 0; // extruder auto fan state stored as bitmap
#endif
#if EXTRUDERS > 3
# error Unsupported number of extruders
@ -399,6 +400,55 @@ void manage_heater()
} // End extruder for loop
#if EXTRUDER_0_AUTO_FAN_PIN > -1
// check the extruder 0 setting (and any ganged auto fan outputs)
bool newFanState = (EXTRUDER_0_AUTO_FAN_PIN > -1 &&
(current_temperature[0] > EXTRUDER_AUTO_FAN_TEMPERATURE ||
(EXTRUDER_0_AUTO_FAN_PIN == EXTRUDER_1_AUTO_FAN_PIN && current_temperature[1] > EXTRUDER_AUTO_FAN_TEMPERATURE) ||
(EXTRUDER_0_AUTO_FAN_PIN == EXTRUDER_2_AUTO_FAN_PIN && current_temperature[2] > EXTRUDER_AUTO_FAN_TEMPERATURE)));
if ((extruderAutoFanState & 1) != newFanState) // store state in first bit
{
int newFanSpeed = (newFanState ? EXTRUDER_AUTO_FAN_SPEED : 0);
if (EXTRUDER_0_AUTO_FAN_PIN == FAN_PIN)
fanSpeed = newFanSpeed;
pinMode(EXTRUDER_0_AUTO_FAN_PIN, OUTPUT);
digitalWrite(EXTRUDER_0_AUTO_FAN_PIN, newFanSpeed);
analogWrite(EXTRUDER_0_AUTO_FAN_PIN, newFanSpeed);
extruderAutoFanState = newFanState | (extruderAutoFanState & ~1);
}
#endif //EXTRUDER_0_AUTO_FAN_PIN > -1
#if EXTRUDER_1_AUTO_FAN_PIN > -1
// check the extruder 1 setting (except when extruder 1 is the same as 0)
newFanState = (EXTRUDER_1_AUTO_FAN_PIN > -1 && EXTRUDER_1_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN &&
(current_temperature[1] > EXTRUDER_AUTO_FAN_TEMPERATURE ||
(EXTRUDER_1_AUTO_FAN_PIN == EXTRUDER_2_AUTO_FAN_PIN && current_temperature[2] > EXTRUDER_AUTO_FAN_TEMPERATURE)));
if ((extruderAutoFanState & 2) != (newFanState<<1)) // use second bit
{
int newFanSpeed = (newFanState ? EXTRUDER_AUTO_FAN_SPEED : 0);
if (EXTRUDER_1_AUTO_FAN_PIN == FAN_PIN)
fanSpeed = newFanSpeed;
pinMode(EXTRUDER_1_AUTO_FAN_PIN, OUTPUT);
digitalWrite(EXTRUDER_1_AUTO_FAN_PIN, newFanSpeed);
analogWrite(EXTRUDER_1_AUTO_FAN_PIN, newFanSpeed);
extruderAutoFanState = (newFanState<<1) | (extruderAutoFanState & ~2);
}
#endif //EXTRUDER_1_AUTO_FAN_PIN > -1
#if EXTRUDER_2_AUTO_FAN_PIN > -1
// check the extruder 2 setting (except when extruder 2 is the same as 1 or 0)
newFanState = (EXTRUDER_2_AUTO_FAN_PIN > -1 &&
EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN && EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_1_AUTO_FAN_PIN &&
current_temperature[2] > EXTRUDER_AUTO_FAN_TEMPERATURE);
if ((extruderAutoFanState & 4) != (newFanState<<2)) // use third bit
{
int newFanSpeed = (newFanState ? EXTRUDER_AUTO_FAN_SPEED : 0);
if (EXTRUDER_2_AUTO_FAN_PIN == FAN_PIN)
fanSpeed = newFanSpeed;
pinMode(EXTRUDER_2_AUTO_FAN_PIN, OUTPUT);
digitalWrite(EXTRUDER_2_AUTO_FAN_PIN, newFanSpeed);
analogWrite(EXTRUDER_2_AUTO_FAN_PIN, newFanSpeed);
extruderAutoFanState = (newFanState<<2) | (extruderAutoFanState & ~4);
}
#endif //EXTRUDER_2_AUTO_FAN_PIN > -1
#ifndef PIDTEMPBED
if(millis() - previous_millis_bed_heater < BED_CHECK_INTERVAL)