unity3d.cs

using UnityEngine;
using System.Collections;
using System.IO.Ports;

public class movePlayer : MonoBehaviour
{

    public float speed;
    private float amoutToMove;
    SerialPort sp = new SerialPort("COM3", 9600);

    void Start()
    {
        sp.Open();
        sp.ReadTimeout = 1;
    }

    void Update()
    {
        amoutToMove = speed * Time.deltaTime;

        if (sp.IsOpen)
        {
            try
            {
                MoveObject(sp.ReadByte());
                print(sp.ReadByte());
            }
            catch (System.Exception)
            {
                throw;
            }
        }
    }

    void MoveObject(int direction)
    {
        if (direction == 1)
        {
            transform.Translate(Vector3.left * amoutToMove, Space.World);
        }

        if (direction == 2)
        {
            transform.Translate(Vector3.right * amoutToMove, Space.World);
        }
    }
}