66 lines
2.8 KiB
Python
66 lines
2.8 KiB
Python
# Printer fan support
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#
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# Copyright (C) 2016,2017 Kevin O'Connor <kevin@koconnor.net>
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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 extruder, pins
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FAN_MIN_TIME = 0.1
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PWM_CYCLE_TIME = 0.010
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class PrinterFan:
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def __init__(self, printer, config):
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self.last_fan_value = 0.
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self.last_fan_time = 0.
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self.max_power = config.getfloat('max_power', 1., above=0., maxval=1.)
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self.kick_start_time = config.getfloat('kick_start_time', 0.1, minval=0.)
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self.mcu_fan = pins.setup_pin(printer, 'pwm', config.get('pin'))
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self.mcu_fan.setup_max_duration(0.)
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self.mcu_fan.setup_cycle_time(PWM_CYCLE_TIME)
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self.mcu_fan.setup_hard_pwm(config.getint('hard_pwm', 0))
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def set_pwm(self, mcu_time, value):
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value = max(0., min(self.max_power, value))
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if value == self.last_fan_value:
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return
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mcu_time = max(self.last_fan_time + FAN_MIN_TIME, mcu_time)
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if (value and value < self.max_power
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and not self.last_fan_value and self.kick_start_time):
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# Run fan at full speed for specified kick_start_time
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self.mcu_fan.set_pwm(mcu_time, self.max_power)
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mcu_time += self.kick_start_time
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self.mcu_fan.set_pwm(mcu_time, value)
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self.last_fan_time = mcu_time
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self.last_fan_value = value
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# External commands
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def set_speed(self, print_time, value):
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mcu_time = self.mcu_fan.get_mcu().print_to_mcu_time(print_time)
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self.set_pwm(mcu_time, value)
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class PrinterHeaterFan:
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def __init__(self, printer, config):
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self.fan = PrinterFan(printer, config)
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heater = config.get("heater", "extruder0")
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self.heater = extruder.get_printer_heater(printer, heater)
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if self.heater is None:
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raise config.error("Unknown heater '%s'" % (heater,))
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self.heater_temp = config.getfloat("heater_temp", 50.0)
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printer.reactor.register_timer(self.callback, printer.reactor.NOW)
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def callback(self, eventtime):
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current_temp, target_temp = self.heater.get_temp()
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if not current_temp and not target_temp and not self.fan.last_fan_time:
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# Printer still starting
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return eventtime + 1.
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power = 0.
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if target_temp or current_temp > self.heater_temp:
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power = 1.
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mcu_time = self.fan.mcu_fan.get_mcu().system_to_mcu_time(
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eventtime + FAN_MIN_TIME)
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self.fan.set_pwm(mcu_time, power)
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return eventtime + 1.
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def add_printer_objects(printer, config):
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if config.has_section('fan'):
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printer.add_object('fan', PrinterFan(printer, config.getsection('fan')))
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for s in config.get_prefix_sections('heater_fan '):
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printer.add_object(s.section, PrinterHeaterFan(printer, s))
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