Update environment.py, README.md files

README.md

@@ -1,2 +1,42 @@
 # Adafruit IO Raspberry Pi Environmental Sensor
 
+Code based on https://pimylifeup.com/raspberry-pi-humidity-sensor-dht22/
+
+## Code
+
+If you are using the DHT22, DHT11, or the AM2302 you can switch the constant in the code as needed:
+- `Adafruit_DHT.DH11`
+- `Adafruit_DHT.DH22`
+- `Adafruit_DHT.AM2302`
+
+I'm using the AM2302 because it's all pre-wired.
+
+Make sure you also change `ADAFRUIT_IO_KEY`, `ADAFRUIT_IO_USERNAME`, and `LOOP_DELAY_MINS` as desired. You can get Adafruit IO key/username info from your account at https://io.adafruit.com
+
+## Wiring
+
+To connect the sensor to the RasPi:
+
+- If you're using DHT11 or DHT22, place a 10k resistor between Pin 1 and Pin 2 of the DHT sensor (a pull-up resistor from the data pin to the).
+- Wire Pin 1 of the DHT22 to Physical Pin 1 (3v3) on the Pi
+- Wire Pin 2 of the DHT22 to Physical Pin 7 (GPIO4) on the Pi
+- Pin 3 of the DHT11/22 is left blank.
+- Wire Pin 4 of the DHT22 (or Pin 3 of the AM2302) to Physical Pin 6 (GND) on the Pi
+
+Physical pin 1 on the Pi is usually the far bottom-left corner of the GPIO header, as seen when the screenprinted text is right side up. Physical pin 2 is the top-left corner, and continuing in zigzag fashion with odd numbers on bottom and even numbers on top. See the PiMyLifeUp link above for a diagram.
+
+## Installation
+
+Install dependencies: 
+
+  sudo apt-get update
+  sudo apt-get upgrade
+  sudo apt-get install python3-dev python3-pip
+  sudo python3 -m pip install --upgrade pip setuptools wheel
+  sudo pip3 install Adafruit_DHT
+
+Copy the `environment.py` file to a folder of your choosing, make sure you edit it according to the Code section above.
+
+## Running
+
+Run it with `python3 environment.py`

environment.py

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+print("Starting...")
+
+import time
+import Adafruit_DHT
+from Adafruit_IO import Client, Feed, RequestError
+
+ADAFRUIT_IO_KEY = 'YOUR_ADAFRUIT_IO_KEY_HERE'
+ADAFRUIT_IO_USERNAME = 'YOUR_ADAFRUIT_IO_USERNAME_HERE'
+
+LOOP_DELAY_MINS = 10
+DHT_SENSOR = Adafruit_DHT.AM2302
+DHT_PIN = 4
+
+aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
+
+try: # if we already have the feeds, assign them.
+    temperature_feed = aio.feeds('temperature')
+    humidity_feed = aio.feeds('humidity')
+except RequestError: # if we don't, create and assign them.
+    temperature_feed = aio.create_feed(Feed(name='temperature'))
+    humidity_feed = aio.create_feed(Feed(name='humidity'))
+
+while True:
+    humidity, temperature_c = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
+    temperature_f = temperature_c * (9 / 5) + 32
+
+    if humidity is not None and temperature_c is not None:
+        print("TempC={0:0.1f}*C TempF={1:0.1f}*F  Humidity={2:0.1f}%".format(temperature_c, temperature_f, humidity))
+
+        print('sending data to adafruit io...')
+        t_out = aio.send(temperature_feed.key, temperature_f)
+        h_out = aio.send(humidity_feed.key, humidity)
+        if t_out and h_out:
+            print('data sent, sleeping for '+str(LOOP_DELAY_MINS)+' mins')
+        else:
+            print('problem sending data:')
+            print(t_out)
+            print(h_out)
+    else:
+        print("Failed to retrieve data from humidity sensor")
+
+    time.sleep(LOOP_DELAY_MINS * 60)