add brightness property; refactor examples; format with black

Author: CedarGroveStudios

adafruit_neotrellis/multitrellis.py

@@ -103,7 +103,7 @@ def sync(self):
     @property
     def brightness(self):
         """The NeoPixel brightness level of all clustered NeoTrellis boards."""
-        return self.brightness
+        return self._brightness
 
     @brightness.setter
     def brightness(self, new_brightness):

examples/neotrellis_multitrellis_simpletest.py

@@ -27,7 +27,7 @@
 trellis = MultiTrellis(trelli)
 
 # Set the brightness value (0 to 1.0)
-trellis.brightness = 0.05
+trellis.brightness = 0.5
 
 # some color definitions
 OFF = (0, 0, 0)

examples/neotrellis_simpletest.py

@@ -12,7 +12,7 @@
 trellis = NeoTrellis(i2c_bus)
 
 # Set the brightness value (0 to 1.0)
-trellis.brightness = 0.05
+trellis.brightness = 0.5
 
 # some color definitions
 OFF = (0, 0, 0)