disable heaters if a specified mcu is connected

README.md

@@ -126,6 +126,8 @@ See the [Danger Features document](https://dangerklipper.io/Danger_Features.html
 
 - [danger_options: configurable homing constants](https://github.com/DangerKlippers/danger-klipper/pull/378)
 
+- [adxl: disable heaters when connected](https://github.com/DangerKlippers/danger-klipper/pull/425)
+
 If you're feeling adventurous, take a peek at the extra features in the bleeding-edge-v2 branch [feature documentation](docs/Bleeding_Edge.md)
 and [feature configuration reference](docs/Config_Reference_Bleeding_Edge.md):
 

docs/Config_Reference.md

@@ -1091,7 +1091,9 @@ per_move_pressure_advance: False
 #   If true, uses pressure advance constant from trapq when processing moves
 #   This causes changes to pressure advance be taken into account immediately,
 #   for all moves in the current queue, rather than ~250ms later once the queue gets flushed
-
+#disable_if_connected:
+#   List of mcus that should disable the heater if connected, usefull for nozzle adxls
+#   as to not accidentally fry them due to heating the hotend.
 ```
 
 ### [heater_bed]
@@ -1107,6 +1109,7 @@ sensor_pin:
 control:
 min_temp:
 max_temp:
+disable_if_connected:
 #   See the "extruder" section for a description of the above parameters.
 ```
 
@@ -2920,6 +2923,7 @@ target temperature.
 #pwm_cycle_time:
 #min_temp:
 #max_temp:
+#disable_if_connected:
 #   See the "extruder" section for the definition of the above
 #   parameters.
 ```

klippy/extras/heaters.py

@@ -61,6 +61,11 @@ def __init__(self, config, sensor):
             self.printer.get_start_args().get("debugoutput") is not None
         )
         self.can_extrude = self.min_extrude_temp <= 0.0 or is_fileoutput
+        self.disable_if_connected = []
+        if hasattr(config, "getlist"):
+            self.disable_if_connected = config.getlist(
+                "disable_if_connected", self.disable_if_connected
+            )
         self.max_power = config.getfloat(
             "max_power", 1.0, above=0.0, maxval=1.0
         )
@@ -130,6 +135,12 @@ def __init__(self, config, sensor):
             "klippy:shutdown", self._handle_shutdown
         )
 
+    def notify_disabled(self, mcu_name):
+        raise self.printer.command_error(
+            "Heater [%s] is disabled due to [%s] being connected."
+            % (self.short_name, mcu_name)
+        )
+
     def lookup_control(self, profile, load_clean=False):
         algos = collections.OrderedDict(
             {
@@ -1102,6 +1113,16 @@ def check(eventtime):
         self.printer.wait_while(check)
 
     def set_temperature(self, heater, temp, wait=False):
+        for mcu_name in heater.disable_if_connected:
+            if not mcu_name.startswith("mcu"):
+                mcu_name = "mcu " + mcu_name
+            mcu_object = self.printer.lookup_object(mcu_name, None)
+            if (
+                mcu_object is not None
+                and not mcu_object.non_critical_disconnected
+            ):
+                heater.notify_disabled(mcu_name)
+                return
         toolhead = self.printer.lookup_object("toolhead")
         toolhead.register_lookahead_callback((lambda pt: None))
         heater.set_temp(temp)

test/klippy/input_shaper.cfg

@@ -48,6 +48,7 @@ pid_Ki: 1.08
 pid_Kd: 114
 min_temp: 0
 max_temp: 210
+disable_if_connected: mcu
 
 [heater_bed]
 heater_pin: PH5