xmas_tree/example_5.py

   1 import tree
   2 import random
   3
   4 # Some constants to identify each LED
   5 L0 = 1
   6 L1 = 2
   7 L2 = 4
   8 L3 = 8
   9 L4 = 16
  10 L5 = 32
  11 L6 = 64
  12 ALL = 1+2+4+8+16+32+64
  13 NO_LEDS = 0
  14
  15 tree.setup() # you must always call setup() first!
  16
  17 # Two ways of randomly illuminating LEDs (they do the
  18 # same thing but Way 1 is easier to understand whilst
  19 # Way 2 is a shorter piece of code).
  20
  21 # Way 1
  22 for i in range(100): # repeat 100 times
  23   random_led = random.randint(0, 6)
  24   if (random_led == 0):   tree.leds_on_and_wait(L0, 0.2) # D0 on for 0.2s
  25   elif (random_led == 1): tree.leds_on_and_wait(L1, 0.2) # D1 on for 0.2s
  26   elif (random_led == 2): tree.leds_on_and_wait(L2, 0.2) # D2 on for 0.2s
  27   elif (random_led == 3): tree.leds_on_and_wait(L3, 0.2) # D3 on for 0.2s
  28   elif (random_led == 4): tree.leds_on_and_wait(L4, 0.2) # D4 on for 0.2s
  29   elif (random_led == 5): tree.leds_on_and_wait(L5, 0.2) # D5 on for 0.2s
  30   elif (random_led == 6): tree.leds_on_and_wait(L6, 0.2) # D6 on for 0.2s
  31
  32 # Way 2
  33 for i in range(100): # repeat 100 times
  34   random_led = random.randint(0, 6)
  35   tree.leds_on_and_wait(1<<random_led, 0.5) # randomly selected LED on for 0.2s
  36
  37
  38 tree.all_leds_off() # extinguish all LEDs
  39
  40 # All done!
  41 tree.cleanup() # call cleanup() at the end
  42