Merge pull request #62 from RaspberryPiFoundation/led

led compatibility fix

Author: Martin O'Hanlon

docs/developing.rst

@@ -3,10 +3,17 @@ Development
 
 Instructions on how build and deploy picozero.
 
+Pre-requisites
+--------------
+
+To build and deploy picozero, you need to install the dependencies ::
+
+    pip3 install twine sphinx 
+
 Build
 -----
 
-1. Update version numbers in the ``setup.py``, ``picozero/__init__.py``and ``docs/conf.py`` files.
+1. Update version numbers in the ``setup.py``, ``picozero/__init__.py`` and ``docs/conf.py`` files.
 
 2. Add release to ``docs/changelog.rst``
 

picozero/picozero.py

@@ -571,7 +571,11 @@ def LED(pin, use_pwm=True, active_high=True, initial_value=False):
             active_high=active_high,
             initial_value=initial_value)
 
-pico_led = LED(25)
+try:
+    pico_led = LED("LED", use_pwm=False)
+except TypeError:
+    # older version of micropython before "LED" was supported
+    pico_led = LED(25, use_pwm=False)
 
 class PWMBuzzer(PWMOutputDevice):
     """