Motion Detection

Use the motion detector to watch a space that has no movement until an intruder steps into it.

Angle the cam so it can see your intruders before they they’re eyes can glimpse the screen.  (A glimpse is all it takes to cause you headaches.  The human eye can capture and the brain can record at surprisingly high Hrtz.  Depending on your USB camera and the lighting in the room, you have .0100 to .75 of a second befor StopWatch hides your program.  So, that’s how long you’ll need between when your camera sees them and when their eyes glimpse your screen.  IP Cameras are slower than that.  But you can place them down the hall etc.  So they actually give you the most time to prepare.


  1. Attach your external USB 2.0 webcam.  Why external?  A wiggling built-in webcam thinks the whole room is wiggling and triggers!!  It also sees you moving around in front of it and triggers.
    • (Exception:  You can totally use your internal camera if you’re using an external mouse, keyboard and monitor.  Just put your laptop on a non-wiggly suraface and point it at the point of entry–like you would a webcam.  This trick is extra stealthy and was suggested by one of our designers.)
  2. Choose the external webcam from the pulldown list.
    • Point the camera at the point of entry.
    • Make sure the camera sees the intruder first by positioning and angling it strategically.  Angle your screen strategically, too.
    • Physically position your webcam so it won’t wiggle when you type.
    • Click the “filter false movements” button.

A note about friendly ghosts!  Webcams can see movements that humans cannot, including some that aren’t even real (For example, 1970’s fake wood paneling looks like a gently flowing stream to some cameras).  So, clicking the “Recalibrate Motion Detection” button lets StopWatch filter every constant movement, real or imagined by the camera.

Now Test:

  1. Walk into the area your camera is pointed at to see if the word “MOTION” pops up on the Motion Preview dialog.  The more sensitive you make the camera, the faster it will pop up
  2. Adjust the speed slider to get the most sensitive trigger you can without false triggering.
  3. Adjust the size slider so the smallest possible size will trigger stopwatch.  (If a hand holding an iPhone pokes through your door to take a picture of your screen, you want StopWatch to see something that small and hide your confidential work.)
  4. And test again.


    1. Open the app or apps that you’ve targeted to hide or kill or minimize.  (Or, if you haven’t targetted any apps, set them up in the Apps tab first.)  Walk into the point of entry where your camera is watching for movement.  Was your target app hidden by the time you could see your screen?  If not you have at least 4 ways to hide it in time.
      • Angle your screen so it can’t be seen so soon as the intruder walks in.  Every 100th of a second counts!
      • Position your camera so it will see your intruder sooner.
      • Play some more with your Speed and Sensitivity sliders to make triggering faster.
      • Turn on the lights!  Brightness helps.  But a big sun spot in the middle of the picture that’s too bright can hide someone walking in.  Dark shadows can also hide intruders.

Let us know how it goes and if you find any great tricks we haven’t thought of, yet.

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