new_contents: import utime
  import machine
  from hwconfig import LED, BUTTON
  
  # machine.time_pulse_us() function demo
  
  print("""\
  Let's play an interesting game:
  You click button as fast as you can, and I tell you how slow you are.
  Ready? Cliiiiick!
  """)
  
  while 1:
      try:
          delay = machine.time_pulse_us(BUTTON, 1, 10*1000*1000)
          print("You are as slow as %d microseconds!" % delay)
      except OSError:
          print("Well, you're *really* slow")
      utime.sleep_ms(10)
  
subject: Add example for machine.time_pulse_us().