Re: Ultrasonic Sensors

["Tommy" <tommy at leesecurity dot net>]

More information would be helpful on what you are trying to protect.
Just a perimeter, look into photo beams.
watch an area try outdoor motion detectors.

There are many ways to secure an outdoor area, but all have drawbacks
and could possible lead to a higher false alarm rate if not tailored to
your situation. So can you give a little more background on what you
are trying to protect?

Also if you have read the flame session that this thread has become,
you will see RL bass has his hand in it. he runs aon online alarm parts
website. He sometimes gives good advice, but more often than not he
starts these little arguments.

rgondzur wrote:

> My need is to monitor the perimeter of an outdoor area.
> I am considering ultrasonic sensors to act as an intrusion monitor.
> They need to be mounted near ground level.
>
> I need a device similar to what I see on upper-priced automobiles that
> indicate the presence of items around its perimeter.
> I have seen a very nice system mounted on the bumper of a BMW that
> works extremely well to indicate a person walking around the vehicle.
>
> The sensor must be designed for outdoor/external applications.
>
> There will be a series of sensors with patterns that overlap to
> provide detection around the entire perimeter.
> They will all be wired to a controller that will sound an alarm when
> the perimeter has been entered.
>
> Perimeter size can vary from one hundred to several hundred feet.
>
> Since they will be used outdoors, what will the issues be?
>
> Therefore, I am looking for low-power, reliable sensors and the
> suggested controller to manage the system.
>
> Of course, price will be a determinig factor.



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