Add BLE Crickit Light Switch functionality

Initial implementation of BLE Crickit Light Switch functionality, including servo control based on button presses from the Adafruit Bluefruit app.

Author: TheKitty

Crickits/BLE_Crickit_Light_Switch/code.py

@@ -0,0 +1,73 @@
+# SPDX-FileCopyrightText: 2019 John Edgar Park for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+# BLE Crickit Light Switch
+# Use with the Adafruit BlueFruit LE Connect app
+# Works with CircuitPython 5.0.0-beta.0 and later
+# running on an nRF52840 Feather board and Crickit FeatherWing
+# micro servo, 3D printed switch actuator
+
+import time
+
+import board
+import digitalio
+
+from adafruit_crickit import crickit
+
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.nordic import UARTService
+
+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
+
+ble = BLERadio()
+uart_service = UARTService()
+advertisement = ProvideServicesAdvertisement(uart_service)
+
+UP_ANGLE = 180
+NEUTRAL_ANGLE = 120
+DOWN_ANGLE = 60
+crickit.servo_1.angle = NEUTRAL_ANGLE
+
+angle = NEUTRAL_ANGLE  # use to track state
+
+print("BLE Light Switch")
+print("Use Adafruit Bluefruit app to connect")
+while True:
+    blue_led.value = False
+    ble.start_advertising(advertisement)
+
+    while not ble.connected:
+        # Wait for a connection.
+        pass
+    blue_led.value = True  # turn on blue LED when connected
+    while ble.connected:
+        if uart_service.in_waiting:
+            # Packet is arriving.
+            red_led.value = False  # turn off red LED
+            packet = Packet.from_stream(uart_service)
+            if isinstance(packet, ButtonPacket) and packet.pressed:
+                red_led.value = True  # blink to show a packet has been received
+                if packet.button == ButtonPacket.UP and angle != UP_ANGLE:  # UP button pressed
+                    angle = NEUTRAL_ANGLE - 45  # set anticipation angle, opposite of goal angle
+                    for a in range(angle, UP_ANGLE+1, 1):  # anticipation angle, ramp to goal angle
+                        crickit.servo_1.angle = a
+                    time.sleep(0.1)  # wait a moment
+                    crickit.servo_1.angle = NEUTRAL_ANGLE  # then return to neutral angle
+                    angle = UP_ANGLE  # set state to prevent redundant hits
+                elif packet.button == ButtonPacket.DOWN and angle != DOWN_ANGLE:  # DOWN button
+                    angle = NEUTRAL_ANGLE + 45
+                    for a in range(angle, DOWN_ANGLE-1, -1):
+                        crickit.servo_1.angle = a
+                    time.sleep(0.1)  # wait a moment
+                    crickit.servo_1.angle = NEUTRAL_ANGLE  # then return to neutral angle
+                    angle = DOWN_ANGLE  # set state to prevent redundant hits