Accelerometer1

accelerometer.js

var Accelerometer = function() {
...
  if (!!window.DeviceMotionEvent) {
    window.addEventListener("devicemotion", handleMotion, true);
    self.supported = true;
  }
  if (!!window.DeviceOrientationEvent) {
    window.addEventListener("deviceorientation", handleOrientation, true);
    self.supported = true;
  }

  window.addEventListener("compassneedscalibration", function(event) {
    self.supported = true;
    alert('Your compass needs calibrating!');
    event.preventDefault();
  }, true);
...
}