1  """
 2  'tone_demo.py'.
 3  
 4  =================================================
 5  a short piezo song using tone()
 6  """
 7  import time
 8  import board
 9  import simpleio
10  
11  
12  while True:
13      for f in (262, 294, 330, 349, 392, 440, 494, 523):
14          simpleio.tone(board.A0, f, 0.25)
15      time.sleep(1)