def __init__(self, name_serial, nop):
'''
Init drivera NucleoExpander
:param nameSerial: name of serial port exp. 'COM10' or '/tty/ttyUSB'
:param nop: number of packet in one send
'''
self.packetSerial = PacketSender(name_serial, nop)
self.horizontal_servo_angle = 90
self.vertical_servo_angle = 90
