From d166d1f69208b0b5a5eb32d6795c2b7a9485ad63 Mon Sep 17 00:00:00 2001 From: Kevin O'Connor Date: Fri, 19 Jan 2018 23:46:01 -0500 Subject: fan: Move fan code to extras directory The print cooling fan and printer heater_fan are independent modules that can reside in the extras directory. Signed-off-by: Kevin O'Connor --- klippy/extras/fan.py | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 klippy/extras/fan.py (limited to 'klippy/extras/fan.py') diff --git a/klippy/extras/fan.py b/klippy/extras/fan.py new file mode 100644 index 00000000..c7434ca5 --- /dev/null +++ b/klippy/extras/fan.py @@ -0,0 +1,39 @@ +# Printer cooling fan +# +# Copyright (C) 2016-2018 Kevin O'Connor +# +# This file may be distributed under the terms of the GNU GPLv3 license. +import pins + +FAN_MIN_TIME = 0.1 +PWM_CYCLE_TIME = 0.010 + +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.) + self.mcu_fan.setup_cycle_time(PWM_CYCLE_TIME) + self.mcu_fan.setup_hard_pwm(config.getint('hard_pwm', 0)) + 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) -- cgit v1.2.3-70-g09d2