Use Accelerometer for Roll-a-ball Movement in unity 3d

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using UnityEngine;
7. using System.Collections;
9. public class PlayerController : MonoBehaviour
10. {
11. // Using same speed reference in both, desktop and other devices
12. public float speed =1000;
14. void Main ()
15. {
16. // Preventing mobile devices going in to sleep mode
17. //(actual problem if only accelerometer input is used)
18. Screen.sleepTimeout = SleepTimeout.NeverSleep;
19. }
21. void Update()
22. {
24. if (SystemInfo.deviceType == DeviceType.Desktop)
25. {
26. // Exit condition for Desktop devices
27. if (Input.GetKey("escape"))
28. Application.Quit();
29. }
30. else
31. {
32. // Exit condition for mobile devices
33. if (Input.GetKeyDown(KeyCode.Escape))
34. Application.Quit();
35. }
39. }
42. void FixedUpdate ()
43. {
44. if (SystemInfo.deviceType == DeviceType.Desktop)
45. {
46. // Player movement in desktop devices
48. // Definition of force vector X and Y components
49. float moveHorizontal = Input.GetAxis("Horizontal");
50. float moveVertical = Input.GetAxis("Vertical");
51. // Building of force vector
52. Vector3 movement = new Vector3 (moveHorizontal,0.0f,moveVertical);
53. // Adding force to rigidbody
54. rigidbody.AddForce(movement * speed * Time.deltaTime);
55. }
56. else
57. {
58. // Player movement in mobile devices
60. // Building of force vector
61. Vector3 movement = new Vector3 (Input.acceleration.x, 0.0f, Input.acceleration.y);
62. // Adding force to rigidbody
63. rigidbody.AddForce(movement * speed * Time.deltaTime);
64. }
67. }
70. }
71. 

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