Microscope now only attaches to hardware once an API request is made.

openflexure_microscope/microscope.py

@@ -2,7 +2,7 @@
 """
 Defines a microscope object, binding a camera and stage with basic functionality.
 """
-
+import logging
 import numpy as np
 
 from openflexure_stage import OpenFlexureStage
@@ -20,11 +20,7 @@ class Microscope(object):
         microscope (:py:class:`openflexure_stage.stage.OpenFlexureStage`): stage object
     """
     def __init__(self, camera: StreamingCamera, stage: OpenFlexureStage):
-        print("Assigning camera")
-        self.camera = camera  #: :py:class:`openflexure_microscope.camera.pi.StreamingCamera`: Picamera object
-        print("Assigning stage")
-        self.stage = stage  #: :py:class:`openflexure_stage.stage.OpenFlexureStage`: OpenFlexure stage object
-        self.stage.backlash = np.zeros(3, dtype=np.int)
+        self.attach(camera, stage)
 
     def __enter__(self):
         """Create microscope on context enter."""
@@ -38,6 +34,27 @@ class Microscope(object):
         """Shut down the microscope hardware."""
         self.camera.close()
         self.stage.close()
+    
+    def attach(self, camera: StreamingCamera, stage: OpenFlexureStage):
+        """
+        Retroactively attaches a camera and stage to the microscope object.
+
+        Allows the microscope to be created as a "dummy", with hardware communications
+        opened at a later time.
+
+        Args:
+            camera (:py:class:`openflexure_microscope.camera.pi.StreamingCamera`): camera object
+            microscope (:py:class:`openflexure_stage.stage.OpenFlexureStage`): stage object
+        """
+
+        self.camera = camera  #: :py:class:`openflexure_microscope.camera.pi.StreamingCamera`: Picamera object
+        if isinstance(camera, StreamingCamera):
+            logging.info("Attached camera {}".format(camera))
+
+        self.stage = stage  #: :py:class:`openflexure_stage.stage.OpenFlexureStage`: OpenFlexure stage object
+        if isinstance(self.stage, OpenFlexureStage):  # If a stage object has been attached
+            logging.info("Attached stage {}".format(stage))
+            self.stage.backlash = np.zeros(3, dtype=np.int)
 
     # Create unified state
     @property