xmas_tree/example_4.py

   1 import tree
   2 import time
   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 slightly different ways of flashing *all* LEDs on and off.
  18
  19 # Way 1
  20 for i in range(3): # repeat 3 times
  21   tree.leds_on_and_wait(ALL, 0.5)     # all on for 0.5s
  22   tree.leds_on_and_wait(NO_LEDS, 0.5) # all off for 0.5s
  23
  24 # Way 2
  25 for i in range(3): # repeat 3 times
  26   tree.leds_on_and_wait(ALL, 0.5) # all on for 0.5s
  27   tree.all_leds_off()             # extinguish all LEDs
  28   time.sleep(0.5)                 # wait for 0.5s
  29
  30
  31 tree.all_leds_off() # extinguish all LEDs
  32
  33 # All done!
  34 tree.cleanup() # call cleanup() at the end
  35