Отправить данные в Arduino

Question

Пытаюсь отправить команду Arduino Start drive и получаю ошибку:

Traceback (most recent call last):
  File "moveMotors.py", line 289, in <module>
    main()
  File "moveMotors.py", line 285, in main
    followTheLine()
  File "moveMotors.py", line 250, in followTheLine
    moveMotors(maxMotorPWM, maxMotorPWM - pid)
  File "moveMotors.py", line 80, in moveMotors
    serialArduino.write(struct.pack('>B', right))
struct.error: required argument is not an integer

Я использую Python3 этот код на Python.

def moveMotors(left, right):
    '''Moves the motors with specific speed'''

    if (0 < left <= 255) or (0 < right <= 255):
        serialArduino.write(struct.pack('>B', 254)) # code 254 for moveStright() function on Arduino
        serialArduino.write(struct.pack('>B', left))
        serialArduino.write(struct.pack('>B', right))
    elif left == 0 and right == 0:
        serialArduino.write(struct.pack('>B', 253)) # code 253 for stop() function on Arduino
    else:
        print ("Speed must be an integer between 0 and 255.\n")