'''
Mission 6: Heartbeat
Mild Remix - 2nd option
Adds blinking pixels to the beating heart
 -- This solution has two pixels for large and
    two pixels for small. 
'''
from codex import *
from time import sleep

delay = 1

while True:
    # one heartbeat
    pixels.set(0, RED)
    pixels.set(1, RED)
    pixels.set(2, BLACK)
    pixels.set(3, BLACK)
    display.show(pics.HEART)
    sleep(delay)
    pixels.set(0, BLACK)
    pixels.set(1, BLACK)
    pixels.set(2, RED)
    pixels.set(3, RED)
    display.show(pics.HEART_SMALL)
    sleep(delay)

    if buttons.was_pressed(BTN_A):
        delay = delay + 0.2

    if buttons.was_pressed(BTN_B):
        delay = delay - 0.2