CameraRotate

using UnityEngine;
using System.Collections;

[AddComponentMenu("Camera/Camera Rotate")]
[RequireComponent (typeof (AccelerometerInputBehaviour))]

public class CameraRotate : MonoBehaviour {

    public JoystickBehaviour joystick;
    public float rotateSpeed = 80.0f;

    private AccelerometerInputBehaviour accel;
    private Quaternion startRotation;
    private Quaternion startRotationInvert;

    void Start () {
        startRotation = transform.localRotation;
        startRotationInvert = transform.localRotation;
        startRotationInvert.y += 180;

        accel = GetComponent <AccelerometerInputBehaviour> ();
    }

    void Update () {
        if (joystick.output.y > 0 || Input.GetAxis ("Vertical") > 0)
            transform.localRotation = startRotation;

        else if (joystick.output.y < 0 || Input.GetAxis ("Vertical") < 0)
            transform.localRotation = startRotationInvert;

        else
            transform.Rotate (Vector3.up, rotateSpeed * accel.output * Time.deltaTime);
    }
}