The possibility of a motion detection system based on Wi-Fi technology is an intriguing
one. It would allow for the creation of a security system that would be extremely cost
effective. It also has the possibility of creating systems that are less obtrusive than the
traditional solutions.

All good things however have their limitations. While this nascent technology does have
a lot of potential, it also has some drawbacks. Today, we are going to look at those
limitations and address what you may want to consider before the implementation of
one of these systems.
The Learning Curve
These systems are not currently perfect out of the box. They have been shown to need
some warm up time in order to get an accurate calibration. Research into the systems
have shown a temporal variation that has to be accounted for when a new system is
installed. When these systems have been in operation as little as two weeks the results
can show a statistical change. This means that systems can have false negatives early
in its operation. A false negative can be a serious flaw, and it may require the addition of
a camera based system to make sure that there is no activity missed.

Inability to Distinguish Types of Activity
The reverse of the false negative is the false positive. When it comes to motion
detection systems of any kind the false positive is easy to create. Any movement
around the sensors, human or not, will make the sensor trip. Beyond actual movement,
the systems can be sensitive to electromagnetic noise as well. Unless you are adept at
adapting faraday cages to your living environments, addressing errant signal could be a
tricky obstacle to smooth operation.

In the modern world we carry a stunning number of devices capable of generating those
signals. This means a properly modified cell phone or lap top could allow for the system
to be tricked, tripped artificially or even remotely. To the degree with which an individual
can affect the signal making it to the motion sensor technology, they can trick or
manipulate the results.

Issues with Power and Wi-Fi Signal
When it comes to systems that are dependent on power any system can be taken out
by the power going down. With a Wi-Fi based system however the power is not the only
utility that can go down. A service provider (or their equipment) outage can eliminate the
signal needed to detect motion. That would leave a security system potentially down
when the systems are needed most. Having said that, battery backup and redundant
services could address this concern without slowing the adoption of this kind of solution.

Multiple Signal Source Confusion
When it comes to source confusion, the problems occur when there are more than two people
moving in the room. As they create waves in the magnetic field that can be detected,
the waves will overlap. Multiple people moving around will create more noise in the field.
So a room full of people can create enough of a disturbance that would allow for some
things to move through the noise essentially undetected.

On the whole, this technology is promising but there are still some refinements that
need to be made in order to avoid many of the adoption pitfalls. As with any new
technology it should improve with time. If you are willing to tolerate the hurdles that
come with this type of solution, there may be some significant benefits for you to enjoy.