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heater: Support max_power setting for heaters

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Change the mcu PWM value from an integer (0-255) to a float (0. - 1.).
Add support for limiting the maximum power (as measured over a
sufficiently long duration) to a particular heater.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-08-25 11:24:18 -04:00
parent 54002c4391
commit f53897758d
4 changed files with 40 additions and 29 deletions
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8
klippy/fan.py
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@ -11,7 +11,7 @@ class PrinterFan:
self.printer = printer
self.config = config
self.mcu_fan = None
self.last_fan_value = 0
self.last_fan_value = 0.
self.last_fan_time = 0.
self.kick_start_time = config.getfloat('kick_start_time', 0.1)
def build_config(self):
@ -20,15 +20,15 @@ class PrinterFan:
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)))
value = max(0., min(1., value))
if value == self.last_fan_value:
return
mcu_time = self.mcu_fan.print_to_mcu_time(print_time)
mcu_time = max(self.last_fan_time + FAN_MIN_TIME, mcu_time)
if (value and value < 255
if (value and value < 1.
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(mcu_time, 255)
self.mcu_fan.set_pwm(mcu_time, 1.)
mcu_time += self.kick_start_time
self.mcu_fan.set_pwm(mcu_time, value)
self.last_fan_time = mcu_time