Adaptive Night Light for BBC microBit using Micropython

night_light.py

from microbit import *

LIGHT_LEVEL = 255 / 4

ALL_PIXELS = set(list(range(25)))

def square(x, y, side):
    pixels_on = set()
    for x_offset in range(side):
        for y_offset in range(side):
            pixels_on.add(y_offset * 5 + x_offset + x + (y * 5))
    pixels_off = ALL_PIXELS.difference(pixels_on)

    for pixel in ALL_PIXELS:
        if pixel in pixels_on:
            display.set_pixel(pixel % 5, pixel // 5, 9)
        else:
            display.set_pixel(pixel % 5, pixel // 5, 0)

while True:
    if display.read_light_level() < LIGHT_LEVEL:
        square(0, 0, 5)
    elif display.read_light_level() < LIGHT_LEVEL * 2:
        square(1, 1, 3)
    elif display.read_light_level() < LIGHT_LEVEL * 3:
        square(2, 2, 1)
    else:
        display.clear()