Input.acceleration  

// Move object using accelerometer
var speed = 10.0;

function Update () {
    var dir : Vector3 = Vector3.zero;

    // we assume that device is held parallel to the ground
    // and Home button is in the right hand
    
    // remap device acceleration axis to game coordinates:
    //  1) XY plane of the device is mapped onto XZ plane
    //  2) rotated 90 degrees around Y axis
    dir.x = -Input.acceleration.y;
    dir.z = Input.acceleration.x;
    
    // clamp acceleration vector to unit sphere
    if (dir.sqrMagnitude > 1)
        dir.Normalize();
    
    // Make it move 10 meters per second instead of 10 meters per frame...
    dir *= Time.deltaTime;
        
    // Move object
    transform.Translate (dir * speed);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public float speed = 10.0F;
    void Update() {
        Vector3 dir = Vector3.zero;
        dir.x = -Input.acceleration.y;
        dir.z = Input.acceleration.x;
        if (dir.sqrMagnitude > 1)
            dir.Normalize();
        
        dir *= Time.deltaTime;
        transform.Translate(dir * speed);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public speed as single = 10.0F

    def Update():
        dir as Vector3 = Vector3.zero
        dir.x = (-Input.acceleration.y)
        dir.z = Input.acceleration.x
        if dir.sqrMagnitude > 1:
            dir.Normalize()
        dir *= Time.deltaTime
        transform.Translate((dir * speed))