Adding dht22 example, updating header to include MIT license info

switch pins

Author: brentru

examples/basics/analog_output.py

@@ -1,13 +1,26 @@
 """
 `analog_output.py`
--------------------
-PWM a LED from
-Adafruit IO!
+===============================================================================
+PWM a LED from Adafruit IO!
 
-Requires:
-    - Adafruit-Blinka
-    - Adafruit-CircuitPython-PCA9685
+Tutorial Link: https://learn.adafruit.com/adafruit-io-basics-analog-output
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Author(s): Brent Rubell for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.
+
+Dependencies:
+    - Adafruit_Blinka
+        (https://github.com/adafruit/Adafruit_Blinka)
+    - Adafruit_CircuitPython_PCA9685
+        (https://github.com/adafruit/Adafruit_CircuitPython_PCA9685)
 """
+
 # import system libraries
 import time
 

examples/basics/rgb_led.py

@@ -1,12 +1,25 @@
 """
 `rgb_led.py`
-------------------------
+=======================================================================
 Control a RGB LED using
 Adafruit IO and Python
 
-Requires:
-    - Adafruit-Blinka
-    - Adafruit-CircuitPython-PCA9685
+Tutorial Link: https://learn.adafruit.com/adafruit-io-basics-color
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Author(s): Brent Rubell for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.
+
+Dependencies:
+    - Adafruit_Blinka
+        (https://github.com/adafruit/Adafruit_Blinka)
+    - Adafruit_CircuitPython_PCA9685
+        (https://github.com/adafruit/Adafruit_CircuitPython_PCA9685)
 """
 # import system libraries
 import time

examples/basics/servo.py

@@ -1,14 +1,28 @@
 """
 `servo.py`
-------------------
-Control a servo
-with Adafruit IO
-
-Requires:
-    - Adafruit-Blinka
-    - Adafruit-CircuitPython-PCA9685
-    - Adafruit-CircuitPython-Motor
+========================================================================
+
+Control a servo with Adafruit IO
+Tutorial Link: https://learn.adafruit.com/adafruit-io-basics-servo
+
+Adafruit invests time and resources providing this open source code.
+Please support Adafruit and open source hardware by purchasing
+products from Adafruit!
+
+Author(s): Brent Rubell for Adafruit Industries
+Copyright (c) 2018 Adafruit Industries
+Licensed under the MIT license.
+All text above must be included in any redistribution.
+
+Dependencies:
+    - Adafruit_Blinka
+        (https://github.com/adafruit/Adafruit_Blinka)
+    - Adafruit_CircuitPython_PCA9685
+        (https://github.com/adafruit/Adafruit_CircuitPython_PCA9685)
+    - Adafruit_CircuitPython_Motor
+        (https://github.com/adafruit/Adafruit_CircuitPython_Motor)
 """
+
 # import system libraries
 import time
 

examples/basics/temp_humidity.py

@@ -0,0 +1,64 @@
+"""
+'temp_humidity.py'
+==================================
+Example of sending analog sensor
+values to an Adafruit IO feed.
+
+Author(s): Brent Rubell
+
+Tutorial Link: Tutorial Link: https://learn.adafruit.com/adafruit-io-basics-temperature-and-humidity
+
+Dependencies:
+    - Adafruit IO Python Client
+        (https://github.com/adafruit/io-client-python)
+    - Adafruit_Python_DHT
+        (https://github.com/adafruit/Adafruit_Python_DHT)
+"""
+
+# import standard python modules.
+import time
+
+# import adafruit dht library.
+import Adafruit_DHT
+
+# import Adafruit IO REST client.
+from Adafruit_IO import Client, Feed
+
+# Delay in-between sensor readings, in seconds.
+DHT_READ_TIMEOUT = 5
+
+# Pin connected to DHT22 data pin
+DHT_DATA_PIN = 26
+
+# 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)
+
+# Set up Adafruit IO Feeds.
+temperature_feed = aio.feeds('temperature')
+humidity_feed = aio.feeds('humidity')
+
+# Set up DHT22 Sensor.
+dht22_sensor = Adafruit_DHT.DHT22
+
+while True:
+    humidity, temperature = Adafruit_DHT.read_retry(dht22_sensor, DHT_DATA_PIN)
+    if humidity is not None and temperature is not None:
+        print('Temp={0:0.1f}*C Humidity={1:0.1f}%'.format(temperature, humidity))
+        # Send humidity and temperature feeds to Adafruit IO
+        temperature = '%.2f'%(temperature)
+        humidity = '%.2f'%(humidity)
+        aio.send(temperature_feed.key, str(temperature))
+        aio.send(humidity_feed.key, str(humidity))
+    else:
+        print('Failed to get DHT22 Reading, trying again in ', DHT_READ_TIMEOUT, 'seconds')
+    # Timeout to avoid flooding Adafruit IO
+    time.sleep(DHT_READ_TIMEOUT)