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# A micro:bit Firefly.
# By Nicholas H.Tollervey. Released to the public domain.
import radio
import random
from microbit import display, Image, button_a, sleep
# Create the "flash" animation frames. Can you work out how it's done?
flash = [Image().invert()*(i/9) for i in range(9, -1, -1)]
# The radio won't work unless it's switched on.
radio.on()
# Event loop.
while True:
# Button A sends a "flash" message.
if button_a.was_pressed():
radio.send('flash') # a-ha
# Read any incoming messages.
incoming = radio.receive()
if incoming == 'flash':
# If there's an incoming "flash" message display
# the firefly flash animation after a random short
# pause.
sleep(random.randint(50, 350))
display.show(flash, delay=100, wait=False)
# Randomly re-broadcast the flash message after a
# slight delay.
if random.randint(0, 9) == 0:
sleep(500)
radio.send('flash') # a-ha
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