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# Support fans that are enabled when temperature exceeds a set threshold
#
# Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import fan
PIN_MIN_TIME = 0.100
KELVIN_TO_CELCIUS = -273.15
class TemperatureFan:
def __init__(self, config):
self.name = config.get_name()
self.printer = config.get_printer()
self.fan = fan.PrinterFan(config)
self.mcu = self.fan.mcu_fan.get_mcu()
self.fan_speed = config.getfloat('fan_speed', 1., minval=0., maxval=1.)
min_temp = config.getfloat('min_temp', minval=KELVIN_TO_CELCIUS)
max_temp = config.getfloat('max_temp', above=min_temp)
self.temp = config.getfloat('temp', 40. if max_temp > 40. else max_temp,
minval=min_temp, maxval=max_temp)
self.fan.set_shutdown_speed(1.)
self.last_temp = KELVIN_TO_CELCIUS
self.sensor = self.printer.lookup_object('heater').setup_sensor(config)
self.sensor.setup_minmax(min_temp, max_temp)
self.sensor.setup_callback(self.temperature_callback)
def printer_state(self, state):
if state == 'ready':
reactor = self.printer.get_reactor()
reactor.register_timer(self.callback, reactor.NOW)
def callback(self, eventtime):
power = 0.
if self.last_temp > self.temp:
power = self.fan_speed
print_time = self.mcu.estimated_print_time(eventtime) + PIN_MIN_TIME
self.fan.set_speed(print_time, power)
return eventtime + 1.
def temperature_callback(self, read_time, temp):
self.last_temp = temp
def stats(self, eventtime):
return True, '%s: temp=%.1f' % (self.name, self.last_temp)
def load_config_prefix(config):
return TemperatureFan(config)
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