diff options
Diffstat (limited to 'klippy/fan.py')
| -rw-r--r-- | klippy/fan.py | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/klippy/fan.py b/klippy/fan.py new file mode 100644 index 00000000..52374844 --- /dev/null +++ b/klippy/fan.py @@ -0,0 +1,39 @@ +# Printer fan support +# +# Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net> +# +# This file may be distributed under the terms of the GNU GPLv3 license. + +FAN_MIN_TIME = 0.1 + +class PrinterFan: + def __init__(self, printer, config): + self.printer = printer + self.config = config + self.mcu_fan = None + self.last_fan_clock = self.last_fan_value = 0 + self.min_fan_clock = 0 + self.kick_start_clock = 0 + def build_config(self): + pin = self.config.get('pin') + hard_pwm = self.config.getint('hard_pwm', 128) + mcu_freq = self.printer.mcu.get_mcu_freq() + self.min_fan_clock = int(FAN_MIN_TIME * mcu_freq) + kst = self.config.getfloat('kick_start_time', 0.1) + self.kick_start_clock = int(kst * mcu_freq) + self.mcu_fan = self.printer.mcu.create_pwm(pin, hard_pwm, 0) + # External commands + def set_speed(self, print_time, value): + value = max(0, min(255, int(value*255. + 0.5))) + if value == self.last_fan_value: + return + pc = int(self.mcu_fan.get_print_clock(print_time)) + pc = max(self.last_fan_clock + self.min_fan_clock, pc) + if (value and value < 255 + and not self.last_fan_value and self.kick_start_clock): + # Run fan at full speed for specified kick_start_time + self.mcu_fan.set_pwm(pc, 255) + pc += self.kick_start_clock + self.mcu_fan.set_pwm(pc, value) + self.last_fan_clock = pc + self.last_fan_value = value |