Merge pull request #1 from patrickgardella/master

Add explanations to the README.md and sample code files clarifying wh…

Author: ladyada

README.md

@@ -16,3 +16,7 @@ Alternatively you can install from pip with:
     sudo pip install adafruit-ws2801
 
 Note that the pip install method **won't** install the example code.
+
+## Pin numbering
+
+The library (and the sample code) use the Broadcom BCM GPIO pin numbering scheme, rather than the physical pin numbering scheme. The [Adafruit T-Cobbler breakout board](https://www.adafruit.com/products/1754), for example, uses the BCM scheme. See [https://pinout.xyz](https://pinout.xyz/) for a quick-reference image.

examples/rainbow.py

@@ -13,6 +13,8 @@
 # Configure the count of pixels:
 PIXEL_COUNT = 10
 
+# The WS2801 library makes use of the BCM pin numbering scheme. See the README.md for details.
+
 # Specify a software SPI connection for Raspberry Pi on the following pins:
 PIXEL_CLOCK = 18
 PIXEL_DOUT  = 23

examples/simpletest.py

@@ -13,6 +13,8 @@
 # Configure the count of pixels:
 PIXEL_COUNT = 10
 
+# The WS2801 library makes use of the BCM pin numbering scheme. See the README.md for details.
+
 # Specify a software SPI connection for Raspberry Pi on the following pins:
 PIXEL_CLOCK = 18
 PIXEL_DOUT  = 23