Adding code for CPX bat

Adding code for Circuit Playground Express bat. Uses two servos to flap wings. Onboard NeoPixels display the comet animation

Author: BlitzCityDIY

CPX_Halloween_Bat/code.py

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+# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import pwmio
+import neopixel
+from adafruit_motor import servo
+from adafruit_led_animation.animation.comet import Comet
+from adafruit_led_animation.sequence import AnimationSequence
+from adafruit_led_animation.color import PURPLE
+
+#  create 2 PWM instances for the servos
+left_pwm = pwmio.PWMOut(board.A3, duty_cycle=2 ** 15, frequency=50)
+right_pwm = pwmio.PWMOut(board.A6, duty_cycle=2 ** 15, frequency=50)
+
+#  left wing servo
+left_servo = servo.Servo(left_pwm)
+#  right wing servo
+right_servo = servo.Servo(right_pwm)
+
+#  use onboard neopixels on CPX
+pixel_pin = board.NEOPIXEL
+#  number of onboard neopixels
+num_pixels = 10
+
+#  neopixels object
+pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.05, auto_write=False)
+
+#  comet animation
+comet = Comet(pixels, speed=0.01, color=PURPLE, tail_length=10, bounce=True)
+
+#  create animation sequence
+animations = AnimationSequence(comet)
+
+#  beginning angles for each wing
+left_angle = 100
+right_angle = 30
+
+while True:
+	#  run comet animation while servos move
+    animations.animate()
+
+	#  left angle decreases by 10
+    left_angle = left_angle - 10
+	#  once it's less than 30 degrees, reset to 100
+    if left_angle < 30:
+        left_angle = 100
+	#  right angle increases by 10
+    right_angle = right_angle + 10
+	#  once it's greater than 100, reset to 30
+    if right_angle > 100:
+        right_angle = 30
+	#  move left wing
+    left_servo.angle = left_angle
+	#  move right wing
+    right_servo.angle = right_angle
+	#  delay
+    time.sleep(0.05)