reworked cage_func to use class for axes

settings.py

@@ -0,0 +1,27 @@
+import numpy as np
+
+global XY_DEVICE
+global Z_DEVICE
+
+global X_AXIS  # object structure: (device, channel, arduino pin, axis index)
+global Y_AXIS
+global Z_AXIS
+
+global AXES  # list containing [X_AXIS, Y_AXIS, Z_AXIS]
+
+# Constants:
+COIL_CONST = np.array([38.6, 38.45, 37.9]) * 1e-9  # Coil constants [x,y,z] in T/A
+AMBIENT_FIELD = np.array([80]) * 1e-6  # ambient magnetic field in measurement area, to be cancelled out
+RESISTANCES = np.array([3.9, 1, 1])  # resistance of [x,y,z] circuits
+MAX_WATTS = np.array([8, 0, 0])  # max. allowed power for [x,y,z] circuits
+MAX_VOLTS = [16, 16, 16]  # max. allowed voltage, limited to 16V by used diodes!
+
+# COM-Ports for power supply units:
+XY_PORT = "COM1"  # placeholders
+Z_PORT = "COM2"
+
+global ARDUINO
+
+RELAY_PINS = [15, 16, 17]  # pin on the Arduino for switching relay of each axis [x,y,z]
+
+# ToDo: make proper settings file to read from and write to