Add guidelines about lighthouse base station mounting configuration

source/Hardware Guide/Lighthouses/setup.rst

@@ -3,14 +3,48 @@
 Setup
 #########################
 
-1. Mount 2 Vive Base Station Lighthouses over the setup.
+1. Mount 2 Vive Base Station Lighthouse over the setup.
 
    .. image:: ../../_static/images/lighthouses/vive_front.jpg
      :width: 48 %
    .. image:: ../../_static/images/lighthouses/vive_front.jpg
      :width: 48 %
 
+   Follow these guidelines to decide where to mount your two Lighthouse base stations:
+
+   - They should be centered above and facing the area that will be occupied by the lighthouse receivers.
+   - The lighthouses should have the same orientation.
+   - The distance between the receiver and the transmitters should not exceed the maximum range. This depends 
+     on the sensitivity of the receiver's photodiode on the headstage and is best determined experimentally. Each 
+     base station has a 120° field of view. However, the photodiode has a larger chance of being obstructed from 
+     the transmitter by parts on the headstage at larger angles.
+   - Position measurements are noisier when receivers are at the boundary of the transmitters' range, so leave a 
+     safe margin. 
+   - A receiver must be in range of _both_ transmitters in order to measure position. 
+   - Secure the base stations such that they can't be easily jostled or moved.
+
+   .. tip::
+      To confirm if the base station configuration covers the entire desired range, slowly move 
+      the TS4231 device through the entire desired range while running 
+      `an example workflow <https://open-ephys.github.io/bonsai-onix1-docs/articles/hardware/hs64/workflow.html>`_ and
+      `inspecting the TS4231V1PositionData position data visualizer <https://open-ephys.github.io/bonsai-onix1-docs/articles/getting-started/visualize-data.html>`_. 
+      If the TS4231V1PositionData operator ceases to produce data (i.e. if the visualizer stops updating) 
+      at a certain spot, the current base station configuration does not cover that spot. If you are unfamiliar with 
+      using Bonsai to acquire Onix data to do this, visit the OpenEphys.Onix1 Bonsai package 
+      `Getting Started page <https://open-ephys.github.io/bonsai-onix1-docs/articles/getting-started/index.html>`_.
+
+   The image below shows a cartoon of what a lighthouse setup might look with a commutator as well mounted
+   on extruded aluminum rail. The overlapping green area represents the region where a TS4231 device is in 
+   range of both base stations and can measure position.
+
+   .. image:: ../../_static/images/lighthouses/lighthouse_active-range.svg
+
+   The image below shows an photo of how the actual mounting hardware looks for mounting on extruded aluminum rail. 
+
+   .. image:: ../../_static/images/lighthouses/lighthouse-mount-example.png
+
 2. Connect one power adaptor to each base station.
+
 3. Using an audio to audio cable, connect the basestations to each other to
    synchronise them.
 
@@ -19,7 +53,9 @@ Setup
    .. image:: ../../_static/images/lighthouses/vive_back.jpg
        :width: 48%
 
-4. Set one base station to 'A' and one to 'b' using the channel button
+4. Manage the cables such that they don't occlude the TS4231 receivers from the Lighthouse base station transmitters.
+
+5. Set one base station to 'A' and one to 'b' using the channel button
    (illustration below is from the `Vive manual
    <https://www.vive.com/eu/support/vive/category_howto/about-the-base-stations.html>`_)