first commit of BLE Crickit Light Switch code

BLE_Crickit_Light_Switch/ble_crickit_light_switch.py

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+# BLE Crickit Light Switch
+# Use with the Adafruit BlueFruit LE Connect app
+# Works with CircuitPython 4.0.0-beta.1 and later
+# running on an nRF52840 Feather board and Crickit FeatherWing
+# micro servo, 3D printed switch actuator
+
+import board
+import digitalio
+
+from adafruit_crickit import crickit
+from adafruit_ble.uart import UARTServer
+
+from adafruit_bluefruit_connect.packet import Packet
+# Only the packet classes that are imported will be known to Packet.
+from adafruit_bluefruit_connect.button_packet import ButtonPacket
+
+# Prep the status LEDs on the Feather
+blue_led = digitalio.DigitalInOut(board.BLUE_LED)
+red_led = digitalio.DigitalInOut(board.RED_LED)
+blue_led.direction = digitalio.Direction.OUTPUT
+red_led.direction = digitalio.Direction.OUTPUT
+
+uart_server = UARTServer()
+
+UP_ANGLE = 180
+NEUTRAL_ANGLE = 120
+DOWN_ANGLE = 80
+
+advertising_now = False
+angle = NEUTRAL_ANGLE
+crickit.servo_1.angle = NEUTRAL_ANGLE
+
+while True:
+    crickit.servo_1.angle = NEUTRAL_ANGLE
+    if not uart_server.connected:
+        if not advertising_now:
+            uart_server.start_advertising()
+            advertising_now = True
+            blue_led.value = False
+        continue
+
+    # Connected, so no longer advertising.
+    advertising_now = False
+    blue_led.value = True
+
+    if uart_server.in_waiting:
+        red_led.value = False
+        packet = Packet.from_stream(uart_server)
+
+        if isinstance(packet, ButtonPacket):
+            if packet.pressed:
+                red_led.value = True
+                if packet.button == '5' and angle != UP_ANGLE:
+                    # The Up button was pressed.
+                    for a in range(angle, UP_ANGLE+1, 1):
+                        crickit.servo_1.angle = a
+                    angle = UP_ANGLE
+
+                elif packet.button == '6' and angle != DOWN_ANGLE:
+                    # The Down button was pressed.
+                    for a in range(angle, DOWN_ANGLE-1, -1):
+                        crickit.servo_1.angle = a
+                    angle = DOWN_ANGLE