Re: Motion detectors for a scratchbuilt system

On Sat, 27 Dec 2008 10:07:16 -0700, Bob La Londe wrote:

"Gerald Livingston" <none@xxxxxxxxxxx> wrote in message
news:x4KdnUsZa-M9vszUnZ2dnUVZ_jSdnZ2d@xxxxxxxxxxxxxxxx

First, a blast from the past...

and the present... and the future...

Cheap is a key factor.

WHY!!!!!!!!

Uhhh, you never asked my definition of cheap. Browsing the group posts
I've seen mention of motion sensors in the "well above $100" range. I'm
not spending $1000+ on this, I can't afford that right now. $20 - $40 per
sensor is acceptable if they have the adjustments I need. I suspect I'm
not going to find sensors that actually have adjustable latch delays so
I'm going to have to scratchbuild something like a quick 555 or R/C+relay
circuit to handle the latching.

I'm not having a full blown system installed because this particular
piece of property will "go away" in the next couple of years because
there's a new power transmission line coming through the area. When the
power company buys it from me I'll use the $$$ to set up a new building
with proper security on my other land.

There are plenty of affordable new motion sensors that perform well and
cost a reasonable amount. Why in the world would you go through all
this extra effort to save a dollar just to inflict pain and suffering on
yourself and those who have to live around you?

Aleph XP40. Retail $17.95 brand new. Good basic motion for a clean
environment

Aleph XP5PI. Retail $32.00 brand new. Similar to XP40, but with good
better discrimination circuitry to prevent false alarms from pets.

If you are so cheap as to need to save that little then you are deluded,
and if you are so poor that you can not afford one then you have nothing
to protect anyway.

No, only 4 of my cars, motorcycle, a few tools, and a lifetime of
"sentimental junk" that I'll go through "some day soon" to toss the stuff
that's "not important". 2400 square feet of crap.

"Clean" would not be the way to describe it so the XP40 is probably out.
I'll google for a data sheet on the XP5PI.

Go ahead now and flame me for not sharing your perspective. We all wait
with baited breath for your witty and insightful repartee, extolling the
virtues of my checkered passed, interesting mental status, and
prestigious ancestry. LOL.

Bob La Londe

Besides the above bits, I like to tinker. Maybe this isn't a good group
for tinkerers to be asking questions but it seemed my best choice for the
questions I asked.

There's no need for a full system right now. The garage is out in the
sticks and the thieves that broke in a couple of months ago were most
likely local kids/hoods. They grabbed a few random things that were easy
to carry while completely missing items that are worth quite a bit of
cash. I just need a noisemaker to warn them off. And a louder noisemaker
to wake the neighbor so she can call me if they don't heed the warning. I
have a handful of siren drivers and horns in one of my junk boxes, I just
need the motion detectors to hook them up to.

The whole rig will be attached to about $1000 worth of deep cycle
batteries that I have installed in my VW camper. those are attached to an
80 amp RV battery maintainer that stays plugged in to keep them in good
shape. Even if the little hooligans get cute and cut my electric service
those batteries will run the sirens and sensors for a week or two. They
push my 2000 watt stereo at reasonable (not kid loud ear splitting
stupid) volume for 2 or 3 days. When I take the camper out I have a
couple of spare batteries and a smaller charger.

Thank you,

Gerald


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