'''
Mission 12 - Night Light
The program uses the light sensor to make CodeX
act as a night light. It will gradually brighten
the pixels as the light reading gets darker, or
turn off pixels if there is light.
Concepts learned: 
    reading from the light sensor, using pixels.fill()
    to set all pixels one color, using the argument
    brightness to control the pixel brightness
'''
from codex import *
from time import sleep

# select a value slightly under the 
# room light readings 
ROOM = 5500

while True:
    value = light.read()
    if value < ROOM:
        scaled = (1 - value / ROOM) * 20
        level = int(scaled)
        pixels.fill(WHITE, brightness = level)
    else:
        pixels.fill(BLACK)