Changed the name of the .py file to adafruit_dht; update api.rst and … (#2)

* Changed the name of the .py file to adafruit_dht; update api.rst and example file to reference new name.

* re-raise the exception after the import of adafruit_dhtlib

* Remove lib from comment.

adafruit_dht.py

@@ -30,8 +30,12 @@ CircuitPython support for the DHT11 and DHT22 temperature and humidity devices.
 
 import array
 import time
-import pulseio
-
+try:
+    import pulseio
+except ImportError as excpt:
+    print("adafruit_dht requires the pulseio library, but it failed to load."+
+        "  Note that CircuitPython does not support pulseio on all boards.")
+    raise excpt
 
 class DHTBase:
     """ base support for DHT11 and DHT22 devices
@@ -66,9 +70,9 @@ class DHTBase:
 
         stop is the index to convert upto but not including
 
-        Returns an integer containing the converted 1 and 0 bites
+        Returns an integer containing the converted 1 and 0 bits
         """
-        # humidity 16 bites
+
         binary = 0
         hi_sig = False
         for bit_inx in range(start, stop):
@@ -99,20 +103,20 @@ class DHTBase:
         with pulseio.PulseIn(self._pin, 81, True) as pulse_in:
 
             # The DHT type device use a specialize 1-wire protocol
-            # The microprocess first sends a LOW signal for a
-            # specific length of time.  Then the device send back a
-            # series HIGH and LOW signals.  The length the signals
-            # determine the device values.
+            # The microprocessor first sends a LOW signal for a
+            # specific length of time.  Then the device sends back a
+            # series HIGH and LOW signals.  The length the HIGH signals
+            # represents the device values.
             pulse_in.pause()
             pulse_in.clear()
             pulse_in.resume(self._trig_wait)
 
             # loop until we get the return pulse we need or
-            # time out after 2 seconds
+            # time out after 1/2 seconds
             while True:
                 if len(pulse_in) >= 80:
                     break
-                if time.monotonic()-tmono > 0.5: # time out after 2 seconds
+                if time.monotonic()-tmono > 0.5: # time out after 1/2 seconds
                     break
 
             pulse_in.pause()
@@ -140,7 +144,7 @@ class DHTBase:
                 buf = array.array('B')
                 for byte_start in range(0, 80, 16):
                     buf.append(self._pulses_to_binary(pulses, byte_start, byte_start+16))
-                #print(bites)
+                #print(buf)
 
                 # humidity is 2 bytes
                 if self._dht11:

api.rst

@@ -2,5 +2,5 @@
 DHT Libary Documentation
 ============================
 
-.. automodule:: adafruit_dhtlib
+.. automodule:: adafruit_dht
    :members:

examples/dhttoleddisplay.py

@@ -5,7 +5,7 @@ the DHT device data wire is connected to board.D2
 """
 # import for dht devices
 import time
-import adafruit_dhtlib
+import adafruit_dht
 from board import D2
 
 #imports for 7-segment display device
@@ -22,7 +22,7 @@ display = bcddigits.BCDDigits(spi, cs, nDigits=8)
 display.brightness(5)
 
 #initial the dht device
-dhtDevice = adafruit_dhtlib.DHT22(D2)
+dhtDevice = adafruit_dht.DHT22(D2)
 
 while True:
     try: