Add pulse to LEDBoard, re: #165

gpiozero/boards.py

@@ -179,6 +179,30 @@ class LEDBoard(LEDCollection):
             self._blink_thread.stop()
             self._blink_thread = None
 
+    def pulse(self, fade_in_time=1, fade_out_time=1, n=None, background=True):
+        """
+        Make the device fade in and out repeatedly.
+
+        :param float fade_in_time:
+            Number of seconds to spend fading in. Defaults to 1.
+
+        :param float fade_out_time:
+            Number of seconds to spend fading out. Defaults to 1.
+
+        :param int n:
+            Number of times to blink; ``None`` (the default) means forever.
+
+        :param bool background:
+            If ``True`` (the default), start a background thread to continue
+            blinking and return immediately. If ``False``, only return when the
+            blink is finished (warning: the default value of *n* will result in
+            this method never returning).
+        """
+        on_time = off_time = 0
+        self.blink(
+            on_time, off_time, fade_in_time, fade_out_time, n, background
+        )
+
     def _blink_device(self, on_time, off_time, fade_in_time, fade_out_time, n, fps=50):
         sequence = []
         if fade_in_time > 0:

gpiozero/output_devices.py

@@ -414,7 +414,9 @@ class PWMOutputDevice(OutputDevice):
             this method never returning).
         """
         on_time = off_time = 0
-        self.blink(on_time, off_time, fade_in_time, fade_out_time, n, background)
+        self.blink(
+            on_time, off_time, fade_in_time, fade_out_time, n, background
+        )
 
     def _stop_blink(self):
         if self._blink_thread: