'''
Mission 12 - Night Light
Medium Solution - 
The remix uses CodeX as a counter. It counts when something passes
across it, changing the light intensity to dark. This version also
shows an image and waits a short amount of time before checking again
so the same person isn't counted twice. 
'''
from codex import *
from time import sleep

# select a value slightly under the 
# room light readings 
DARK = 2000

# initialize count and set screen
count = 0
pixels.fill(BLACK)
display.print(count, color=BLUE, scale=10)

while True:    
    value = light.read()
    # darkest value
    if value < DARK:
        # turn on pixels, display target, increment count
        pixels.fill(GREEN, brightness=20)
        display.show(pics.TARGET)
        count = count + 1
        # wait one second before reading light sensor again
        sleep(1)
        # turn off pixels, display count
        pixels.fill(BLACK)
        display.clear()
        display.print(count, color=BLUE, scale=10)