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Nuts & Volts Magazine (June 2017)

Do-It-Yourself Super Simple Security System

By Clark Hamilton    View In Digital Edition  

When I go out or retire for the evening, I want to know that all of my doors are locked — not just closed. Walking around to check seven doors on two different levels is a chore. I needed a security system that will tell me quickly and conveniently if all the doors are locked. Here’s how I did it.


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