Device-Orientation example

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var deviceOrientation = new ol.DeviceOrientation();

function el(id) {
  return document.getElementById(id);
}

el('track').addEventListener('change', function() {
  deviceOrientation.setTracking(this.checked);
});

deviceOrientation.on('change', function(event) {
  el('alpha').innerText = deviceOrientation.getAlpha() + ' [rad]';
  el('beta').innerText = deviceOrientation.getBeta() + ' [rad]';
  el('gamma').innerText = deviceOrientation.getGamma() + ' [rad]';
  el('heading').innerText = deviceOrientation.getHeading() + ' [rad]';
});

// tilt the map
deviceOrientation.on(['change:beta', 'change:gamma'], function(event) {
  var center = view.getCenter();
  var resolution = view.getResolution();
  var beta = event.target.getBeta() || 0;
  var gamma = event.target.getGamma() || 0;

center[0] -= resolution * gamma * 25;
  center[1] += resolution * beta * 25;

view.setCenter(view.constrainCenter(center));
});

<!DOCTYPE html>
<html>
<head>
<title>Device-Orientation example</title>
<script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://openlayers.org/en/v3.9.0/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.9.0/build/ol.js"></script>

</head>
<body>
<div class="container-fluid">

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
    <div class="span12">
      <h4 id="title">Device orientation example</h4>
      <label class="checkbox" for="track">
        <input id="track" type="checkbox"/>track changes
      </label>
      <p>&alpha; : <code id="alpha"></code></p>
      <p>&beta; : <code id="beta"></code></p>
      <p>&gamma; : <code id="gamma"></code></p>
      <p>heading : <code id="heading"></code></p>
    </div>
  </div>
</div>

</div>
<script>
var projection = ol.proj.get('EPSG:3857');
var view = new ol.View({
  center: [0, 0],
  projection: projection,
  extent: projection.getExtent(),
  zoom: 2
});
var map = new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],
  target: 'map',
  controls: ol.control.defaults({
    attributionOptions: /** @type {olx.control.AttributionOptions} */ ({
      collapsible: false
    })
  }),
  view: view
});

var deviceOrientation = new ol.DeviceOrientation();

function el(id) {
  return document.getElementById(id);
}

el('track').addEventListener('change', function() {
  deviceOrientation.setTracking(this.checked);
});

deviceOrientation.on('change', function(event) {
  el('alpha').innerText = deviceOrientation.getAlpha() + ' [rad]';
  el('beta').innerText = deviceOrientation.getBeta() + ' [rad]';
  el('gamma').innerText = deviceOrientation.getGamma() + ' [rad]';
  el('heading').innerText = deviceOrientation.getHeading() + ' [rad]';
});

// tilt the map
deviceOrientation.on(['change:beta', 'change:gamma'], function(event) {
  var center = view.getCenter();
  var resolution = view.getResolution();
  var beta = event.target.getBeta() || 0;
  var gamma = event.target.getGamma() || 0;

  center[0] -= resolution * gamma * 25;
  center[1] += resolution * beta * 25;

  view.setCenter(view.constrainCenter(center));
});

</script>
</body>
</html>