controller_fan: Add support for a fan cooling the controller-board (#1070)
Whenever a stepper driver or a heater becomes active, it is desirable to turn on a fan cooling the associated parts on the controller board. This module implements such a fan that turns on whenever a stepper or specified heater turns on, decelerates to a configurable speed when all of the watched parts turn off, and returns to an off-speed, when a user-defined timeout is met. Signed-off-by: Nils Friedchen <Nils.Friedchen@googlemail.com>
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# is 1.0
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# Controller cooling fan. A "controller fan" is a fan that will be
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# enabled whenever its associated heater or any configured stepper
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# driver is active. The fan will stop, whenever an idle_timeout is
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# reached to ensure no overheating will occur after deactivating a
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# watched component.
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#[controller_fan]
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#pin:
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#max_power:
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#shutdown_speed:
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#cycle_time:
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#hardware_pwm:
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#kick_start_time:
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# See the "fan" section in example.cfg for a description of the
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# above parameters.
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#idle_timeout:
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# The ammount of time (in seconds) after a stepper driver or heater
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# was active and the fan should be kept running. The default
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# is 30 seconds.
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#idle_speed:
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# The fan speed (expressed as a value from 0.0 to 1.0) that the fan
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# will be set to when a heater or stepper driver was active and before
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# the idle_timeout is reached. This must be greater or equal
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# max_power. The default is max_power
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#heater:
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# Name of the config section defining the heater that this fan is
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# associated with. If a comma separated list of heater names is
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# provided here, then the fan will be enabled when any of the given
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# heaters are enabled. The default is "extruder".
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# Temperature-triggered cooling fans (one may define any number of
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# sections with a "temperature_fan" prefix). A "temperature fan" is a
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# fan that will be enabled whenever its associated sensor is above a
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# Support a fan for cooling the MCU whenever a stepper or heater is on
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#
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# Copyright (C) 2019 Nils Friedchen <nils.friedchen@googlemail.com>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import fan
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PIN_MIN_TIME = 0.100
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class ControllerFan:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.printer.register_event_handler("klippy:ready", self.handle_ready)
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self.steppers = []
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self.fan = fan.PrinterFan(config)
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self.mcu = self.fan.mcu_fan.get_mcu()
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self.max_power = config.getfloat(
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'max_power', 1., minval=0., maxval=1.)
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self.idle_speed = config.getfloat(
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'idle_speed', self.max_power, minval=0., maxval=self.max_power)
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self.idle_timeout = config.getint("idle_timeout", 30, minval=0)
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self.heater_name = config.get("heater", "extruder")
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self.last_on = self.idle_timeout
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def handle_ready(self):
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pheater = self.printer.lookup_object('heater')
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self.heaters = [pheater.lookup_heater(n.strip())
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for n in self.heater_name.split(',')]
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kin = self.printer.lookup_object('toolhead').get_kinematics()
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self.steppers = kin.get_steppers()
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reactor = self.printer.get_reactor()
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reactor.register_timer(self.callback, reactor.NOW)
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def callback(self, eventtime):
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power = 0.
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active = False
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for stepper in self.steppers:
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active |= stepper.is_motor_enabled()
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for heater in self.heaters:
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currentTemp, targetTemp = heater.get_temp(eventtime)
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if targetTemp:
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active = True
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if active:
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self.last_on = 0
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power = self.max_power
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else:
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if self.last_on < self.idle_timeout:
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power = self.idle_speed
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self.last_on += 1
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print_time = self.mcu.estimated_print_time(eventtime) + PIN_MIN_TIME
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self.fan.set_speed(print_time, power)
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return eventtime + 1.
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def load_config(config):
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return ControllerFan(config)
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