CircusPython BLE demo guide code

CircusPython_BLE/circus.py

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+# CircusPython!
+# For use with the Adafruit BlueFruit LE Connect app.
+# Works with CircuitPython 4.0.0-beta.1 and later running on an nRF52840 board.
+
+import random
+import time
+
+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.color_packet import ColorPacket
+from adafruit_bluefruit_connect.button_packet import ButtonPacket
+
+# Initialize the NeoPixel ring to a fire color, not too bright.
+crickit.init_neopixel(24, brightness=0.1)
+color = (25, 12, 0)
+
+# Creates a sparkly "fire"-like effect.
+def sparkle():
+    crickit.neopixel[random.randrange(24)] = (0, 0, 0)
+    crickit.neopixel[random.randrange(24)] = color
+    crickit.neopixel[random.randrange(24)] = color
+    crickit.neopixel[random.randrange(24)] = color
+
+uart_server = UARTServer()
+
+# Increase this to slow down movement of the servo arm.
+DELAY = 0.0
+
+# Angle for Blinka before jumping through the ring.
+UP_ANGLE = 50
+
+# Go to this angle when jumping through the ring. Adjust
+# slightly as necessary so you don't bump into the ring.
+DOWN_ANGLE = 2
+
+advertising_now = False
+crickit.servo_1.angle = UP_ANGLE
+angle = UP_ANGLE
+
+while True:
+    sparkle()
+    if not uart_server.connected:
+        if not advertising_now:
+            uart_server.start_advertising()
+            advertising_now = True
+        continue
+
+    # Connected, so no longer advertising.
+    advertising_now = False
+
+    if uart_server.in_waiting:
+        packet = Packet.from_stream(uart_server)
+        if isinstance(packet, ColorPacket):
+            # Change the fire color.
+            color = packet.color
+        elif isinstance(packet, ButtonPacket):
+            if packet.pressed:
+                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
+                        # Sparkle while moving.
+                        sparkle()
+                        time.sleep(DELAY)
+                    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
+                        # Sparkle while moving.
+                        sparkle()
+                        time.sleep(DELAY)
+                    angle = DOWN_ANGLE