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 <kevin@koconnor.net>

1 files changed, 37 insertions, 0 deletions

diff --git a/klippy/extras/heater_fan.py b/klippy/extras/heater_fan.py
new file mode 100644
index 00000000..2b5ff904
--- /dev/null
+++ b/klippy/extras/heater_fan.py
@@ -0,0 +1,37 @@
+# Support fans that are enabled when a heater is on
+#
+# 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, extruder
+
+PIN_MIN_TIME = 0.100
+
+class PrinterHeaterFan:
+    def __init__(self, config):
+        self.printer = config.get_printer()
+        self.heater_name = config.get("heater", "extruder0")
+        self.heater_temp = config.getfloat("heater_temp", 50.0)
+        self.fan = fan.PrinterFan(config)
+        self.mcu = self.fan.mcu_fan.get_mcu()
+        max_power = self.fan.max_power
+        self.fan_speed = config.getfloat(
+            "fan_speed", max_power, minval=0., maxval=max_power)
+        self.fan.mcu_fan.setup_start_value(0., max_power)
+    def printer_state(self, state):
+        if state == 'ready':
+            self.heater = extruder.get_printer_heater(
+                self.printer, self.heater_name)
+            reactor = self.printer.get_reactor()
+            reactor.register_timer(self.callback, reactor.NOW)
+    def callback(self, eventtime):
+        current_temp, target_temp = self.heater.get_temp(eventtime)
+        power = 0.
+        if target_temp or current_temp > self.heater_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 load_config(config):
+    return PrinterHeaterFan(config)