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'[EE]: low power rf application'
2002\02\03@161252 by Tom Messenger

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I responded to a question a few days ago about low power rf. Here is what
I've got.

We were recently visited by scum sucking rat bastards (pardon me, that
should probably be "juvenile delinquent benevolent society") who stole a CD
player out of my wifes car late at night. I have little interest in
conventional shrieker car alarms that go on and on and on if you are not
present to shut them off.  So I bought a wireless doorbell at the local
hardware store for about $20 US.

It has a receiver unit that plugs into the wall.  The tx part is the size
of a normal doorbell button and has a 12 volt alkaline battery.  It pulls
1.5mA when on. There are 8 jumpers to set the address to something
different from your neighbors if they have one too.

I wired it up to the interior light in my wifes car. If the door is opened,
the interior light comes on and it sends it's signal to the receiver
plugged in next to my bed.

The system does not like being constantly triggered; the chime stops and
starts and stutters. So I added a pic chip to pulse it every 4 seconds or
so. "Bing bong, bing bong. Load your gun, bing bong".

Aside from someone dragging the car onto a trailer and hauling it off (very
difficult considering where it gets parked), this should give some advance
warning of evil doers.  Perhaps something for Mr. Lile to consider using to
protect his car from the next set of visitors, at least until such time as
he has his TOASTMASTER ROBOCOP, MARK ONE ready to roll. "All right suckas,
put 'em up or prepare to be mowed down!"

Best regards,
Tom M.

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2002\02\03@214259 by Gordon Varney

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Tom,
       I believe I know these (Pardon The Quote "scum sucking rat bastards") or at
least there relatives. I live in a small town in rural Southeast Missouri
USA, I have never had anything around my house touched or bothered. However,
about 6 weeks ago, I took my 1999 Dodge 3/4 ton Diesel with 52,xxx miles
("another story to rant about") to the Transmission shop for the 3rd time,
after a complete $3,000 rebuild. (Sorry I got side tracked.)
       The shop wanted me to leave my truck overnight so they could work on it
cold. The next morning I get a call from the Police department. Some one has
broke out the side window, broke all of the dome lights, ripped the dash
out, broke the Shift lever, (It was in there way, while removing the brand
new CD Player) All in all, $1500 damage, plus $500 for the radio, they even
took my leather dress jacket, from the back seat. AND I HAD TO PAY THE
DEDUCTABLE!!!
       The sad thing is that a low power transmitter would not have worked. I am
considering a digital camera, that will take snap shots and store the image
to flash. About one image per 10 seconds, after the alarm has been
activated, till it runs out of memory or until the alarm is reset.
       A JPG 640X480 image is about 40K, an 1megx8 flash is about 25 images, at 10
seconds apart, will be about 4 minutes of pictures. This should be enough to
get at least one good picture.

Gordon Varney
Victim number 3 from the list.


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2002\02\03@224018 by Tom Messenger

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At 08:45 PM 2/3/02 -0600, you wrote:
>        The sad thing is that a low power transmitter would not have
worked. I am
>considering a digital camera, that will take snap shots and store the image
>to flash. About one image per 10 seconds, after the alarm has been
>activated, till it runs out of memory or until the alarm is reset.
>        A JPG 640X480 image is about 40K, an 1megx8 flash is about 25
images, at 10
>seconds apart, will be about 4 minutes of pictures. This should be enough to
>get at least one good picture.
>
>Gordon Varney
>Victim number 3 from the list.

I had an idea along those lines also. It occurred to me that they might
want to tear the car apart trying to find the camera with their photo. So
accompany it with an ISD speech chip that blares out a message like "Your
photo has just been sent to the sheriffs department. Please get out of the
car and an officer will be here in two minutes to arrest you."  This way,
they leave but get *very* worried about their picture being sent off. Also,
it leaves them thinking that their picture *has* been sent off and that
there is no reason to hang around and try to find the camera that took it.

Tom M.

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2002\02\04@063557 by Russell McMahon

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My daughter has a (something like) -->  Intel Digital PCcamera which has
photo-on-movement capability as well as timed multi shot capability. About
$US160 equivalent here. Unlike most in its class it has 16 MB internal
memory, memory expansion, 1024 x 768 resolution, mpeg with sound capability
and much more. Superb value compared to most in its class. Only sad lack is
LCD viewer which is acceptable at the price.

It does about 500 x 640 x 480 AFAIR on internal memory.
Mpeg with sound would be pretty good.
A BRIGHT spot in the cab would help miscreants but MAY not alert them to the
idea that they were being photolit.

The police caught people who broke into our car after they used the
cellphone they stole and I gave the police  a list of numbers called.
"I'll be late in to work this morning ...." - fair go ! The Police visited
him at work :-)





>         The sad thing is that a low power transmitter would not have
worked. I am
> considering a digital camera, that will take snap shots and store the
image
> to flash. About one image per 10 seconds, after the alarm has been
> activated, till it runs out of memory or until the alarm is reset.
>         A JPG 640X480 image is about 40K, an 1megx8 flash is about 25
images, at 10
> seconds apart, will be about 4 minutes of pictures. This should be enough
to
> get at least one good picture.
>
> Gordon Varney
> Victim number 3 from the list.
>
>
> >
> > I responded to a question a few days ago about low power rf. Here is
what
{Quote hidden}

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2002\02\04@110927 by Lawrence Lile

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I got robbed the same way a coupla months ago.  To add insult to injury,
they stole my car, drove it to a secluded place, and proceeded to rip out
the CD player.  I recovered the car, sans player.

I considered a lot of security alarms, but so far I have only had tiome to
add a secret kill switch on the starter, so nobody can start it without
knowing where the switch is.  I am going to replace the CD player with a
cheap,cheap radio/casssette player.  I will either fix it so it is very hard
to extract, or very very easy, so they don't tear up my car again.  The more
expensive your radio, the more of a target it is.

I will also hide a nice amplifier inside the dash somewhere, to pump good
sound into the speakers.

I've considered a fake alarm system, an LED that blinks on the dashboard
every ten seconds or so, with an ominous looking box labeled Car ALArm.

--Lawrence


{Original Message removed}

2002\02\04@112352 by Alan B. Pearce

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>I've considered a fake alarm system, an LED that blinks on the dashboard
>every ten seconds or so, with an ominous looking box labeled Car ALArm.

I've always thought a single row of blue LEDs on the roof flashing once they
are underway is likely to be a good attention getting thing. They may not
even realise what is in that 1/2 inch high "rubber" strap across the roof.
The fact that it is made from smoky plastic so you cannot see what is inside
it helps. Just watch what happens when they pass a cop with this blue
flashing light on the roof that they are not aware though :)

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2002\02\04@112617 by Gordon Varney

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I don't think that they should know that there is a camera. Use a pin hole camera, and hide it well. Use an IR led to
light up the car, and just use still capture to flash memory. What they don't know won't hurt me.

Gordon Varney

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2002\02\04@113016 by David VanHorn

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>  I will either fix it so it is very hard to extract, or very very easy,
> so they don't tear up my car again.  The more expensive your radio, the
> more of a target it is.

So true.

I used to do car alarms for a living. Not the pre-packaged things, but
custom systems.  I had a number of people after me to put systems in their
convertibles, which I refused to do.

If it looks expensive, it's a target.
If it looks easy to get to, it's a target.
Locking a convertible is silly, and will just cost you a new top.
Locking a hardtop is slightly less silly, and will cost you a new window.

If they start in, and can't finish the job because you made it too hard,
then they will likely take out their frustrations on the rest of your interior.

>I will also hide a nice amplifier inside the dash somewhere, to pump good
>sound into the speakers.

Good idea. What they can't see, they aren't tempted by.

>I've considered a fake alarm system, an LED that blinks on the dashboard
>every ten seconds or so, with an ominous looking box labeled Car ALArm.

Labels not needed, and would detract from the effect.
The blinking led is probably 80% of the effectiveness of the system.

Use a remote disarm, and NO entry delay. You don't want them to get halfway
through the job before the alarm goes off.

I would be tempted to use a field disturbance sensor with some sort of
quiet alerting like LEDs, or a small beeper, to indicate "I see you" when
someone approaches closer than a couple feet.

The thing you need to do, is encourage him to pick another target.
Risk/benefit is what you're trying to maximize, in his mind, which is not
the same as your mind.  He dosen't care if he destroys $2-3k of your car to
get a stereo that will net him $50, if he thinks he's highly likely to get
away with it.

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2002\02\04@114241 by David VanHorn

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At 10:24 AM 2/4/02 -0600, Gordon Varney wrote:
>I don't think that they should know that there is a camera. Use a pin hole
>camera, and hide it well. Use an IR led to
>light up the car, and just use still capture to flash memory. What they
>don't know won't hurt me.

Sounds like a product idea to me. :)

Sugar-cube camera, with IRLEDS, and some RG-174 off to the storage box. Let
them find the camera, but the storage box should be located somewhere hard
to get to. Many bolts, long threads, different sizes, major PITA to dismount.

You could use RF to send the picture somewhere, but that only works when
you're at home, or at work. Plus the antenna becomes a vulnerable
point.  Storing to flash, in a 1/4 inch steel case sounds like a better
proposition. Something that's not attackable by hammer, or chemicals in a
short time. Also, think about a stun-gun applied to the wiring.

If you store enough frames, then you're bound to get a couple useful ones.

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2002\02\04@115054 by Alan B. Pearce

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>Something that's not attackable by hammer,
>or chemicals in a short time.

Probably need to make it fireproof as well, knowing the little blighters
tendency to put a petrol bomb in things to remove forensic evidence.

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2002\02\04@121839 by David VanHorn

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At 04:48 PM 2/4/02 +0000, Alan B. Pearce wrote:
> >Something that's not attackable by hammer,
> >or chemicals in a short time.
>
>Probably need to make it fireproof as well, knowing the little blighters
>tendency to put a petrol bomb in things to remove forensic evidence.

That's not so hard, good insulation will hold the chips for quite a while.
Xicor NV memory is used in aircraft black boxes.

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2002\02\04@123856 by Mitch Miller

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On Mon, 4 Feb 2002, David VanHorn wrote:

> At 04:48 PM 2/4/02 +0000, Alan B. Pearce wrote:
> > >Something that's not attackable by hammer,
> > >or chemicals in a short time.
> >
> >Probably need to make it fireproof as well, knowing the little blighters
> >tendency to put a petrol bomb in things to remove forensic evidence.
>
> That's not so hard, good insulation will hold the chips for quite a while.
> Xicor NV memory is used in aircraft black boxes.
>

Not as hot as a petrol bomb, but my plain old compact flash card made it
through the laundry the other day (washer AND dryer) and still had all the
data on it!

-- Mitch

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2002\02\04@142705 by goflo

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Related ploy - Stopped losing my VW buses' expensive signal
& marker lenses in parking lots after replacing the Phillips
head fasteners with metric allen key bolts - So far, anyway.

Jack

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2002\02\04@144813 by John Ferrell

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I put a security system in my van last summer from these people:
http://bulldogsecurity.com/
There products are carried by JC Whitney (Web & Catalog) best price you will
find.

I selected one with a remote start so I could get in a warm/cool vehical. By
the time you get this installed and working you will know most everything
you need to know to rework it into exactly what you want.

A tad over a $100 and a full day the first time you install one.
Mine has a remote start, keyless entry, an extra channel (intended to open
trunk)
auto start on low battery, auto start high or low temperature.


John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



{Original Message removed}

2002\02\04@165759 by Tony Nixon

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David VanHorn wrote:
>
> At 10:24 AM 2/4/02 -0600, Gordon Varney wrote:
> >I don't think that they should know that there is a camera. Use a pin hole
> >camera, and hide it well. Use an IR led to
> >light up the car, and just use still capture to flash memory. What they
> >don't know won't hurt me.
>
> Sounds like a product idea to me. :)


I did a similar thing using a PIC and still photos at home.

http://www.bubblesoftonline.com/projects/photo.html

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2002\02\04@183846 by Bob Ammerman

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I've bought 2 CRO's from eBay:

- Tek 465 - 2 channel, delayed sweep, 100Mhz, about $200

- Tek 2246 - 4 channel, delayed sweep, 100Mhz, cursors and measurements,
about $500

The first is a bit cranky (mostly needs a bit of contact cleaner in pots and
switches), but the other is very sweet.

Well worth having if you do any amount of hardware work to speak of. It'll
save oodles of time.

Bob Ammerman
RAm Systems

{Original Message removed}

2002\02\04@184232 by David VanHorn

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>
>- Tek 2246 - 4 channel, delayed sweep, 100Mhz, cursors and measurements,
>about $500

The 22XX series were nice scopes. Good trigger too, which you'll
appreciate, if you ever have to use one with a bad trigger.

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2002\02\04@194529 by Josh Koffman

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You could also stick a little dummy antenna on the car to help bolster
this bluff.

Josh
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Tom Messenger wrote:
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2002\02\05@044528 by Alan B. Pearce

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>Not as hot as a petrol bomb, but my plain old compact flash card made it
>through the laundry the other day (washer AND dryer) and still had all the
>data on it!

Ahh you took literally that little application that shows on your screen
massages about washing/drying the hard drive :))))))))))))))

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2002\02\05@112204 by Peter L. Peres

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> camera to shoot pics of vandals

Take a look at the Aiptek pencam series. Add a PIC for control.

Peter

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