Microbit Python Script to control a light up dragon egg

draggonEgg.py

from microbit import *
from neopixel import NeoPixel

num_pixels = 47
purple = (64,0,64)
red = (255,0,0)
off = (0,0,0)
speed = 50 # in ms
steps = 20
currentColour = off

angryTimeout = 3500 

pixels = NeoPixel(pin0, num_pixels)

# Set all LEDs to a colour.
def setAll(colour):
    for pixel_id in range(0, len(pixels)):
        pixels[pixel_id] = colour
    pixels.show()
    
def fade(start, finish=(0,0,0), n=10, d=20, override=False):
  ''' returns a gradient list of (n) colors between
    two rgb color tuples. start and finish.
    n is the number of iterations per fade,
    d is the speed between steps
    override will ignore checking if shaken, only used
    when the egg has been shaken.'''
  # Starting and ending colors in RGB form
  s = start
  f = finish
  # Initilize a list of the output colors with the starting color
  # Calcuate a color at each evenly spaced value of t from 1 to n
  for t in range(1, n):
    # Interpolate RGB vector for color at the current value of t
    curr = [
      int(s[j] + (float(t)/(n-1))*(f[j]-s[j]))
      for j in range(3)
    ]
    currentColour = curr
    setAll(curr)
    if override is False:
        checkforshake()
    sleep(d)
  return

# Check to see if the egg was shaken
# If it was, immediately fade to red,
# Sleep, then go back to normal.
def checkforshake():
    if accelerometer.was_gesture('shake'):
        fade(currentColour, red, steps, speed, True)
        sleep(angryTimeout)
        fade(red, currentColour, steps, speed, True)

# Loop forever, fading between purple and off.
while True:
    fade(purple, off, steps, speed)
    fade(off, purple, steps, speed)