text: """power read demo."""
  
  from nanpy.arduinotree import ArduinoTree
  from nanpy.serialmanager import SerialManager
  
  
  def power_demo():
      connection = SerialManager()
      a = ArduinoTree(connection=connection)
      Vcc = a.vcc.read()
      msg = 'Power supply= %0.2f V' % Vcc
      print(msg)
  
  if __name__ == '__main__':
      power_demo()
  