adding pi camera example to library

examples/basics/pi_camera.py

@@ -0,0 +1,62 @@
+"""
+'pi_camera.py'
+=======================================
+Example for sending pictures taken by
+a Raspberry Pi camera to an
+Adafruit IO feed.
+"""
+# import standard python modules
+import time
+import base64
+import os
+
+# import Adafruit IO REST client
+from Adafruit_IO import Client, Feed, RequestError
+
+# import raspberry pi camera module
+import picamera
+
+# camera capture interval, in seconds
+CAMERA_INTERVAL = 3
+
+# Set to your Adafruit IO key.
+# Remember, your key is a secret,
+# so make sure not to publish it when you publish this code!
+ADAFRUIT_IO_KEY = 'YOUR_AIO_KEY'
+
+# Set to your Adafruit IO username.
+# (go to https://accounts.adafruit.com to find your username)
+ADAFRUIT_IO_USERNAME = 'YOUR_AIO_USERNAME'
+
+# Create an instance of the REST client
+aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
+
+# Adafruit IO Pi Camera Feed
+# note: this feed requires its history to be
+# turned off from the adafruit io feed page
+picam_feed = aio.feeds('picam')
+
+# set up picamera
+camera = picamera.PiCamera()
+
+# set the resolution of the camera's captures
+# note: Adafruit IO feeds with history turned
+# OFF only support images < 1kb
+camera.resolution = (200, 200)
+
+print('Adafruit IO: Raspberry Pi Camera Example')
+
+while True:
+  camera.capture('image.jpg')
+  print('Camera: SNAP!')
+  with open("image.jpg", "rb") as imageFile:
+    image = base64.b64encode(imageFile.read())
+    # encode the b64 bytearray as a string for adafruit-io
+    image_string = image.decode("utf-8")
+    try:
+      aio.send(picam_feed.key, image_string)
+      print('Picture sent to Adafruit IO')
+    except:
+      print('Sending to Adafruit IO Failed...')
+
+  time.sleep(CAMERA_INTERVAL)