Added user interface elements for magnetometer calibration

src/helmholtz_cage_device.py

@@ -81,6 +81,9 @@ class HelmholtzCageDevice:
             # The axes talks to the HW objects (Arduino, PSU) referenced in this object
             self.axes.append(Axis(i, self))
 
+        # Zero and activate channels. This is a sort of "armed" state so that we can send commands later
+        self.idle()
+
         # --- HW COMMUNICATION THREAD ---
         self._cmd_exec_thread = Thread(target=self._cmd_exec_thread_method)
         self._cmd_exec_thread.start()
@@ -92,6 +95,7 @@ class HelmholtzCageDevice:
     def reconnect_hardware(self):
         self.shutdown()
         self.connect_hardware()
+        self.idle()
 
     # TODO: Move to proxy
     def connect_hardware(self):
@@ -133,9 +137,6 @@ class HelmholtzCageDevice:
                 self.psu2 = None
                 ui_print("Error creating PSU device:\n{}".format(e))
 
-            # Zero and activate channels. This is a sort of "armed" state so that we can send commands later
-            self.idle()
-
     def idle(self):
         """ Zero and activate channels """
         if self.psu1 is not None:
@@ -144,6 +145,9 @@ class HelmholtzCageDevice:
             self.psu2.idle()
         if self.arduino is not None:
             self.arduino.idle()
+        # Since these actions are not handled by the axes objects, also make sure to update their target field status
+        for axis in self.axes:
+            axis.target_current = 0
 
     def request_proxy(self):
         """Returns a new HelmholtzCageProxy or None, depending on if access is available"""
@@ -222,7 +226,6 @@ class HelmholtzCageDevice:
                 else:
                     raise Exception("Command unknown!")
 
-
     def _hw_poll_thread_method(self):
         """This method forms the main thread for hardware command execution."""
         while True: