Add light sensor to peripherals

Author: makermelissa

adafruit_magtag/peripherals.py

@@ -56,6 +56,9 @@ def __init__(self):
         self._speaker_enable.direction = Direction.OUTPUT
         self._speaker_enable.value = False
 
+        # Battery Voltage
+        self._light = AnalogIn(board.LIGHT)
+
         # Buttons
         self.buttons = []
         for pin in (board.BUTTON_A, board.BUTTON_B, board.BUTTON_C, board.BUTTON_D):
@@ -143,3 +146,11 @@ def any_button_pressed(self):
         Return whether any button is pressed
         """
         return False in [self.buttons[i].value for i in range(0, 4)]
+
+    @property
+    def light(self):
+        """
+        Return the value of the light sensor. The neopixel_disable property
+        must be false to get a value.
+        """
+        return self._light.value