change(bsec): Documentation

Documentation/pycardium/bme680.rst

@@ -46,6 +46,14 @@ library will be activated which offers the following extra functionality:
 
            time.sleep(1)
 
+You can use the return type of :py:meth:`~bme680.Bme680.get_data` to decide
+if you want to use/display the additonal fields returned if BSEC is enabled.
+
+.. code-block:: python
+
+    if isinstance(d, bme680.BSECData):
+        print("Air quality:    {:7d}".format(d.iaq))
+
 Sensor Class
 ------------
 

pycardium/modules/py/bme680.py

@@ -78,6 +78,9 @@ class Bme680:
         - ``iaq_accuracy``: Accuracy of indoor air quality
         - ``eco2``: Equivalent CO2 content in *ppm*
 
+        If BSEC is enabled an instance of `bme680.BSECData` will be returned.
+        If BSEC is not enabled an instance of `bme680.Bme680Data` will be returned.
+
         **Example**:
 
         .. code-block:: python