Adding dht11 package as submodule

Updating humidity sensor to use dht11's defined constants instead of magic
numbers.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "greenpithumb/dht11"]
+	path = greenpithumb/dht11
+	url = https://github.com/szazo/DHT11_Python.git

.travis.yml

@@ -3,6 +3,7 @@ language: python
 python:
   - "2.7"
 install:
+    - pip install -r requirements.txt
     - pip install -r test_requirements.txt
     - pip install coveralls
 script:

build

@@ -1 +1,4 @@
-coverage run --source greenpithumb -m unittest discover
+coverage run \
+  --source greenpithumb \
+  --omit "greenpithumb/dht11/*" \
+  -m unittest discover

greenpithumb/humidity_sensor.py

@@ -1,5 +1,7 @@
 import dht11_exceptions
 
+from dht11 import dht11
+
 
 class HumiditySensor(object):
     """Wrapper for humidity sensor. Wraps DHT11 sensor."""
@@ -19,11 +21,11 @@ def get_humidity_level(self):
 
         # TODO(JeetShetty): Replace error codes with constants from dht11
         # module
-        if error_code != 0:
-            if error_code == 1:
+        if error_code != dht11.DHT11Result.ERR_NO_ERROR:
+            if error_code == dht11.DHT11Result.ERR_MISSING_DATA:
                 raise dht11_exceptions.MissingDataError(
                     "DHT11 sensor reported missing data")
-            elif error_code == 2:
+            elif error_code == dht11.DHT11Result.ERR_CRC:
                 raise dht11_exceptions.IncorrectCRCError(
                     "DHT11 sensor reported incorrect CRC")
             else:

requirements.txt

@@ -0,0 +1 @@
+RPi.GPIO

tests/test_humidity_sensor.py

@@ -5,6 +5,7 @@
 
 from greenpithumb import humidity_sensor
 from greenpithumb import dht11_exceptions
+from greenpithumb.dht11 import dht11
 
 
 class HumiditySensorTest(unittest.TestCase):
@@ -17,21 +18,22 @@ def setUp(self):
 
     def test_humidity_50(self):
         """Value given should be value returned."""
-        self.mock_dht11_result.error_code = 0
+        self.mock_dht11_result.error_code = dht11.DHT11Result.ERR_NO_ERROR
         self.mock_dht11_result.humidity = 50.0
         humidity_level = self.humidity_sensor.get_humidity_level()
         self.assertEqual(humidity_level, 50.0)
 
     def test_missing_data_error(self):
-        """Error code of 1 should raise an exception."""
+        """Error code of ERR_MISSING_DATA should raise an exception."""
         with self.assertRaises(dht11_exceptions.MissingDataError):
-            self.mock_dht11_result.error_code = 1
+            self.mock_dht11_result.error_code = (
+                dht11.DHT11Result.ERR_MISSING_DATA)
             self.humidity_sensor.get_humidity_level()
 
     def test_incorrect_crc_error(self):
-        """Error code of 2 should raise an exception."""
+        """Error code of ERR_CRC should raise an exception."""
         with self.assertRaises(dht11_exceptions.IncorrectCRCError):
-            self.mock_dht11_result.error_code = 2
+            self.mock_dht11_result.error_code = dht11.DHT11Result.ERR_CRC
             self.humidity_sensor.get_humidity_level()
 
     def test_error_code_out_of_range(self):