38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
# Printer fan support
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#
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# Copyright (C) 2016 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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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.printer = printer
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self.config = config
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self.mcu_fan = None
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self.last_fan_value = 0.
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self.last_fan_time = 0.
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self.kick_start_time = config.getfloat('kick_start_time', 0.1)
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def build_config(self):
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pin = self.config.get('pin')
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hard_pwm = self.config.getint('hard_pwm', 0)
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self.mcu_fan = self.printer.mcu.create_pwm(
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pin, PWM_CYCLE_TIME, hard_pwm, 0.)
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# External commands
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def set_speed(self, print_time, value):
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value = max(0., min(1., value))
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if value == self.last_fan_value:
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return
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mcu_time = self.mcu_fan.print_to_mcu_time(print_time)
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mcu_time = max(self.last_fan_time + FAN_MIN_TIME, mcu_time)
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if (value and value < 1.
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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, 1.)
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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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