Fix #568

Update examples in pin factory docs so they work correctly.

gpiozero/pins/native.py

@@ -161,10 +161,11 @@ class NativeFactory(LocalPiFactory):
 
     You can construct native pin instances manually like so::
 
-        from gpiozero.pins.native import NativePin
+        from gpiozero.pins.native import NativeFactory
         from gpiozero import LED
 
-        led = LED(NativePin(12))
+        factory = NativeFactory()
+        led = LED(12, pin_factory=factory)
     """
     def __init__(self):
         super(NativeFactory, self).__init__()

gpiozero/pins/pigpio.py

@@ -46,20 +46,21 @@ class PiGPIOFactory(PiFactory):
 
     You can construct pigpio pins manually like so::
 
-        from gpiozero.pins.pigpio import PiGPIOPin
+        from gpiozero.pins.pigpio import PiGPIOFactory
         from gpiozero import LED
 
-        led = LED(PiGPIOPin(12))
+        factory = PiGPIOFactory()
+        led = LED(12, pin_factory=factory)
 
     This is particularly useful for controlling pins on a remote machine. To
     accomplish this simply specify the host (and optionally port) when
     constructing the pin::
 
-        from gpiozero.pins.pigpio import PiGPIOPin
+        from gpiozero.pins.pigpio import PiGPIOFactory
         from gpiozero import LED
-        from signal import pause
 
-        led = LED(PiGPIOPin(12, host='192.168.0.2'))
+        factory = PiGPIOFactory(host='192.168.0.2')
+        led = LED(12, pin_factory=factory)
 
     .. note::
 

gpiozero/pins/rpigpio.py

@@ -40,7 +40,8 @@ class RPiGPIOFactory(LocalPiFactory):
         from gpiozero.pins.rpigpio import RPiGPIOFactory
         from gpiozero import LED
 
-        led = LED(RPiGPIOPin(12))
+        factory = RPiGPIOFactory()
+        led = LED(12, pin_factory=factory)
 
     .. _RPi.GPIO: https://pypi.python.org/pypi/RPi.GPIO
     """

gpiozero/pins/rpio.py

@@ -40,10 +40,11 @@ class RPIOFactory(LocalPiFactory):
 
     You can construct RPIO pins manually like so::
 
-        from gpiozero.pins.rpio import RPIOPin
+        from gpiozero.pins.rpio import RPIOFactory
         from gpiozero import LED
 
-        led = LED(RPIOPin(12))
+        factory = RPIOFactory()
+        led = LED(12, pin_factory=factory)
 
     .. _RPIO: https://pythonhosted.org/RPIO/
     """