Unity 2d object movement using accelerometer

void Update()
    {
        //Get the Input from Horizontal axis
        float moveHorizontal = Input.GetAxis ("Horizontal");
        //Get the Input from Vertical axis
        float moveVertical = Input.GetAxis ("Vertical");
        //Update the Rigidbody 2d velocity according to the axis input
        rb2d.velocity = new Vector2 (moveHorizontal * maxSpeed, moveVertical * maxSpeed);
    }