'''
Mission 6 -- Heartbeat
'''
from codex import *
from time import sleep


delay = 1.0


# Keep displaying beats forever
while True:
    display.show(pics.HEART)
    sleep(delay)
    display.show(pics.HEART_SMALL)
    sleep(delay)


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


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