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# Printer cooling fan
#
# Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import pins
FAN_MIN_TIME = 0.100
class PrinterFan:
def __init__(self, config):
self.last_fan_value = 0.
self.last_fan_time = 0.
self.max_power = config.getfloat('max_power', 1., above=0., maxval=1.)
self.kick_start_time = config.getfloat('kick_start_time', 0.1, minval=0.)
printer = config.get_printer()
self.mcu_fan = pins.setup_pin(printer, 'pwm', config.get('pin'))
self.mcu_fan.setup_max_duration(0.)
cycle_time = config.getfloat('cycle_time', 0.010, above=0.)
hardware_pwm = config.getboolean('hardware_pwm', False)
self.mcu_fan.setup_cycle_time(cycle_time, hardware_pwm)
def set_speed(self, print_time, value):
value = max(0., min(self.max_power, value))
if value == self.last_fan_value:
return
print_time = max(self.last_fan_time + FAN_MIN_TIME, print_time)
if (value and value < self.max_power
and not self.last_fan_value and self.kick_start_time):
# Run fan at full speed for specified kick_start_time
self.mcu_fan.set_pwm(print_time, self.max_power)
print_time += self.kick_start_time
self.mcu_fan.set_pwm(print_time, value)
self.last_fan_time = print_time
self.last_fan_value = value
def load_config(config):
if config.get_name() != 'fan':
raise config.error("Invalid print cooling fan config name")
return PrinterFan(config)
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