Move WiFi signal to next

api/sensor/wifi_signal.rst

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+WiFi Signal Sensor
+==================
+
+Example Usage
+-------------
+
+.. code-block:: cpp
+
+    App.make_wifi_signal_sensor("WiFi Signal Sensor");
+
+.. cpp:namespace:: nullptr
+
+See :cpp:func:`Application::make_wifi_signal_sensor`.
+
+API Reference
+-------------
+
+.. cpp:namespace:: nullptr
+
+.. doxygenclass:: sensor::WiFiSignalSensor
+    :members:
+    :protected-members:
+    :undoc-members:

esphomeyaml/components/sensor/wifi_signal.rst

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+WiFi Signal Sensor
+==================
+
+The ``wifi_signal`` sensor platform allows you to read the signal
+strength of the currently connected :doc:`WiFi Access Point </esphomeyaml/components/wifi>`.
+
+The sensor value is the `"Received signal strength indication" <https://en.wikipedia.org/wiki/Received_signal_strength_indication>`__
+measured in decibels. These values are always negative and the closer they are to zero, the better the signal is.
+
+.. figure:: images/wifi_signal-ui.png
+    :align: center
+    :width: 80.0%
+
+.. code:: yaml
+
+    # Example configuration entry
+    sensor:
+      - platform: wifi_signal
+        name: "WiFi Signal Sensor"
+        update_interval: 15s
+
+Configuration variables:
+------------------------
+
+- **name** (**Required**, string): The name of the hall effect sensor.
+- **update_interval** (*Optional*, :ref:`config-time`): The interval
+  to check the sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.
+- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
+- All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
+
+.. warning::
+
+    Signal strength readings are only available when WiFi in in station mode. Readings are not valid
+    if the device is acting as an access point without any station mode connection.
+
+See Also
+--------
+
+- :ref:`sensor-filters`
+- :doc:`/esphomeyaml/components/wifi`
+- :doc:`API Reference </api/sensor/wifi_signal>`
+- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/sensor/wifi_signal.rst>`__