Merge pull request #21 from FoamyGuy/dannystaple-readme-patch

Fix readme example to use same code from simpletest

Author: FoamyGuy

README.rst

@@ -90,28 +90,30 @@ See Also:
         <http://circuitpython.readthedocs.io/en/latest/docs/pyboard/tutorial/repl.html>`_ (the guide linked was written
         for the pyboard, but it still works), then input the following:
 
-        ::
+        .. code-block:: python
 
             import board
             dir(board)
 
 Without a Context Manager
 -------------------------
 
-In the example below, we create the `HCSR04` object directly, get the distance every 2 seconds, then
-de-initialize the device.
+In the example below, we create the `HCSR04` object directly, get the distance every 2 seconds.
 
-::
+.. code-block:: python
 
-    from adafruit_hcsr04 import HCSR04
-    sonar = HCSR04(trig, echo)
-    try:
-        while True:
-            print(sonar.dist_cm())
-            sleep(2)
-    except KeyboardInterrupt:
-        pass
-    sonar.deinit()
+    import time
+    import board
+    import adafruit_hcsr04
+
+    sonar = adafruit_hcsr04.HCSR04(trigger_pin=board.D5, echo_pin=board.D6)
+
+    while True:
+        try:
+            print((sonar.distance,))
+        except RuntimeError:
+            print("Retrying!")
+        time.sleep(2)
 
 
 With a Context Manager
@@ -121,13 +123,14 @@ In the example below, we use a context manager (the `with <https://docs.python.o
 instance, again get the distance every 2 seconds, but then the context manager handles de-initializing the device for
 us.
 
-::
+.. code-block:: python
 
+    import board
     from adafruit_hcsr04 import HCSR04
-    with HCSR04(trig, echo) as sonar:
+    with HCSR04(trigger_pin=board.D5, echo_pin=board.D6) as sonar:
         try:
             while True:
-                print(sonar.dist_cm())
+                print(sonar.distance)
                 sleep(2)
         except KeyboardInterrupt:
             pass