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# Light LEDs at random and make them fade over time
#
# Usage:
#
# led_dance(delay)
#
# 'delay' is the time between each new LED being turned on.
#
# TODO The random number generator is not great. Perhaps the accelerometer
# or compass could be used to add entropy.
import microbit
import random
def led_dance(delay):
dots = [ [0]*5, [0]*5, [0]*5, [0]*5, [0]*5 ]
while True:
dots[random.randrange(5)][random.randrange(5)] = 8
for i in range(5):
for j in range(5):
microbit.display.set_pixel(i, j, dots[i][j])
dots[i][j] = max(dots[i][j] - 1, 0)
microbit.sleep(delay)
led_dance(100)
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