Device Orientation

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

var gn = new GyroNorm();

gn.init().then(function() {
  gn.start(function(event) {
    var center = view.getCenter();
    var resolution = view.getResolution();
    var alpha = ol.math.toRadians(event.do.beta);
    var beta = ol.math.toRadians(event.do.beta);
    var gamma = ol.math.toRadians(event.do.gamma);

el('alpha').innerText = alpha + ' [rad]';
    el('beta').innerText = beta + ' [rad]';
    el('gamma').innerText = gamma + ' [rad]';

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

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

<!DOCTYPE html>
<html>
  <head>
    <title>Device Orientation</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src=""></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <script src="https://cdn.rawgit.com/dorukeker/gyronorm.js/v2.0.6/dist/gyronorm.complete.min.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <p>
      <div>α : <code id="alpha"></code></div>
      <div>β : <code id="beta"></code></div>
      <div>γ : <code id="gamma"></code></div>
    </p>
    <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: {
            collapsible: false
          }
        }),
        view: view
      });

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


      var gn = new GyroNorm();

      gn.init().then(function() {
        gn.start(function(event) {
          var center = view.getCenter();
          var resolution = view.getResolution();
          var alpha = ol.math.toRadians(event.do.beta);
          var beta = ol.math.toRadians(event.do.beta);
          var gamma = ol.math.toRadians(event.do.gamma);

          el('alpha').innerText = alpha + ' [rad]';
          el('beta').innerText = beta + ' [rad]';
          el('gamma').innerText = gamma + ' [rad]';

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

          view.setCenter(view.constrainCenter(center));
        });
      });
    </script>
  </body>
</html>