Merge branch 'master' into pr-watch

Author: TheKitty

BLE_Client_Server/README.md

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+# Adafruit Learning System tutorial - A CircuitPython BLE Client & Server
+
+Use Bluetooth to turn a server on and off and actively sense the server's status light
+
+Follow the Adafruit learn guide here: https://learn.adafruit.com/circuitpython-ble-client-server/
+
+Adafruit invests time and resources providing this open source code,
+please support Adafruit and open-source hardware by purchasing
+products from [Adafruit](https://www.adafruit.com)!
+ 
+MIT license, project and code by rdagger
+
+All text above, and the splash screen below must be included in any redistribution
+
+-----------------------
+If you are looking to make changes/additions, please use the GitHub Issues and Pull Request mechanisms.

BLE_Client_Server/server.py

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+from adafruit_ble.uart_server import UARTServer
+from adafruit_bluefruit_connect.packet import Packet
+from adafruit_bluefruit_connect.button_packet import ButtonPacket
+from adafruit_bluefruit_connect.color_packet import ColorPacket
+from board import A0, D13
+from analogio import AnalogIn
+from digitalio import DigitalInOut, Direction
+from time import sleep
+ 
+led = AnalogIn(A0)  # Initialize blue LED light detector
+ 
+solenoid = DigitalInOut(D13)  # Initialize solenoid
+solenoid.direction = Direction.OUTPUT
+solenoid.value = False
+ 
+uart_server = UARTServer()
+ 
+while True:
+    uart_server.start_advertising()  # Advertise when not connected.
+ 
+    while not uart_server.connected:  # Wait for connection
+        pass
+ 
+    while uart_server.connected:  # Connected
+        if uart_server.in_waiting:  # Check BLE commands
+            packet = Packet.from_stream(uart_server)
+            if isinstance(packet, ButtonPacket):
+                if packet.button == '1' and packet.pressed:
+                    solenoid.value = True  # Activate solenoid for 1 second
+                    sleep(1)
+                    solenoid.value = False
+ 
+        led_intensity = led.value  # Check blue LED detector intensity
+        led_on = led_intensity > 1000
+        # Color: red = off, green = on
+        color_packet = ColorPacket((255 * int(not led_on), 255 * led_on, 0))
+        try:
+            uart_server.write(color_packet.to_bytes())  # Transmit state color
+        except OSError:
+            pass
+ 
+        sleep(.2)