def is_song_playing(self):
     return binary_response(self._read_sensor_data(37))
 def virtual_wall(self):
     return binary_response(self._read_sensor_data(13))
 def cliff_right(self):
     return binary_response(self._read_sensor_data(12))
 def cliff_front_left(self):
     return binary_response(self._read_sensor_data(10))
 def cliff_left(self):
     return binary_response(self._read_sensor_data(9))
 def wall_sensor(self):
     return binary_response(self._read_sensor_data(8))