Build Instructions

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  CircuitPython code

  """
  This example will figure out the current local time using the internet, and
  then draw out a countdown clock until an event occurs!
  Once the event is happening, a new graphic is shown
  """
  import time
  import board
  from adafruit_pyportal import PyPortal
  from adafruit_bitmap_font import bitmap_font
  from adafruit_display_text.label import Label
   
  # The time of the thing!
  EVENT_YEAR = 2019
  EVENT_MONTH = 4
  EVENT_DAY = 3
  EVENT_HOUR = 15
  EVENT_MINUTE = 0
  # we'll make a python-friendly structure
  event_time = time.struct_time((EVENT_YEAR, EVENT_MONTH, EVENT_DAY,
                                 EVENT_HOUR, EVENT_MINUTE, 0,  # we don't track seconds
                                 -1, -1, False))  # we dont know day of week/year or DST
   
  # determine the current working directory
  # needed so we know where to find files
  cwd = ("/"+__file__).rsplit('/', 1)[0]
  # Initialize the pyportal object and let us know what data to fetch and where
  # to display it
  pyportal = PyPortal(status_neopixel=board.NEOPIXEL,
                      default_bg=cwd+"/countdown_background.bmp")
   
  big_font = bitmap_font.load_font(cwd+"/fonts/Helvetica-Bold-36.bdf")
  big_font.load_glyphs(b'0123456789') # pre-load glyphs for fast printing
  event_background = cwd+"/countdown_event.bmp"
   
  days_position = (8, 207)
  hours_position = (110, 207)
  minutes_position = (220, 207)
  text_color = 0xFFFFFF
   
  text_areas = []
  for pos in (days_position, hours_position, minutes_position):
      textarea = Label(big_font, text='  ')
      textarea.x = pos[0]
      textarea.y = pos[1]
      textarea.color = text_color
      pyportal.splash.append(textarea)
      text_areas.append(textarea)
  refresh_time = None
   
  while True:
      # only query the online time once per hour (and on first run)
      if (not refresh_time) or (time.monotonic() - refresh_time) > 3600:
          try:
              print("Getting time from internet!")
              pyportal.get_local_time()
              refresh_time = time.monotonic()
          except RuntimeError as e:
              print("Some error occured, retrying! -", e)
              continue
   
      now = time.localtime()
      print("Current time:", now)
      remaining = time.mktime(event_time) - time.mktime(now)
      print("Time remaining (s):", remaining)
      if remaining < 0:
          # oh, its event time!
          pyportal.set_background(event_background)
          while True:  # that's all folks
              pass
      secs_remaining = remaining % 60
      remaining //= 60
      mins_remaining = remaining % 60
      remaining //= 60
      hours_remaining = remaining % 24
      remaining //= 24
      days_remaining = remaining
      print("%d days, %d hours, %d minutes and %s seconds" %
            (days_remaining, hours_remaining, mins_remaining, secs_remaining))
      text_areas[0].text = '{:>2}'.format(days_remaining)  # set days textarea
      text_areas[1].text = '{:>2}'.format(hours_remaining) # set hours textarea
      text_areas[2].text = '{:>2}'.format(mins_remaining)  # set minutes textarea
   
      # update every 10 seconds
      time.sleep(10)

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