Josh writes – “Motion detectors typically have 4 wire connections. 2 for DC power and 2 for telling you if the circuit is open or closed.
Most motion detectors will be a normally open circuit. But check it out with a multimeter.
Now you can plug in your mouse to your computer and when someone triggers your motion detector you get a mouse click. What can you do with that you might ask? Well I’m using it for a multimedia installation where I trigger some sounds and projections when people get close enough.
After I made this I found some other stuff on the web that shows a similar idea but using a keyboard connector. If you need lots of inputs thats the way to go.” – Link.
4 thoughts on “HOW TO – Make a motion detector for your computer”
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Most motion detectors are normaly closed so that if the lines are cut, the alarm is trigged. Though, at the same time, many also have a jumper inside to select between NO and NC.
That is true, but more than that a lot of detectors will have an unknown amount of resistance across their normally closed circuit. So if you jump the wire somewhere before the detector, the alarm still knows that someone is tampering.