22 June 2017
BUILD IT YOURSELF
Here is the problem: My house
has a front door, back door,
kitchen door, garage door, and
three patio doors. When I go
out or retire for the evening, I
want to know that all of those
doors are locked. Walking
around to check seven doors on
two different levels is a chore. I
need a security system that will
tell me quickly and conveniently
if all the doors are locked. Of
course, you can buy such a
setup, but the systems that I
looked at don’t fit my needs
very well. For one thing, most
commercial systems indicate if
each door is closed, not if it is
locked. What good is that?
Do-It-Yourself Super Simple
By C.A. Hamilton
Usually, the security readout is at the front door, so if I’m leaving by the back door, I would have to first walk to the front door to arm and check
security. It’s the same problem coming home. I would
really like to be able to see the security status from any
door in the house. And did I mention that I would like
a very inexpensive system?
Back in 1992, while killing time from an airport
delay and thinking about this security problem, I wrote
a list of the specifications of my ideal security system:
1. Checks that doors are locked, not just closed.
2. Indicates status of each door and if all doors are
3. Status (every door locked) indicators at every
4. A special indication that all doors are locked
except the usual exit door (typically the garage).
5. Small inconspicuous indicators readable from 20
6. Easily adapted to any number of doors.
7. Minimum required wiring.
8. Safe, simple, reliable, inexpensive, and