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Add "kick fan" feature - briefly run fan at full speed on start.

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Add a feature to run the cooling fan at full speed for a small period
(default 100ms) when first starting the fan.  Some fans wont reliably
start spinning at low power, and many fans have issue with the PWM at
low power.  However, once the fan starts spinning it can reliably be
set to a wide range of PWM values.
This commit is contained in:
Kevin O'Connor 2012-12-09 23:47:52 -05:00
parent 3f2f94ef28
commit 3d91bd486c
2 changed files with 19 additions and 0 deletions
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14
Marlin/planner.cpp
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@ -466,6 +466,20 @@ void check_axes_activity()
}
#if FAN_PIN > -1
#ifndef FAN_SOFT_PWM
if (FAN_KICKSTART_TIME) {
static unsigned long FanKickEnd;
if (tail_fan_speed) {
if (FanKickEnd == 0) {
// Just starting up fan - run at full power.
FanKickEnd = millis() + FAN_KICKSTART_TIME;
tail_fan_speed = 255;
} else if (FanKickEnd > millis())
// Fan still spinning up.
tail_fan_speed = 255;
} else {
FanKickEnd = 0;
}
}
analogWrite(FAN_PIN,tail_fan_speed);
#endif
#endif