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Glass Breakage Sensors and Range Check

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=64960
Printed Date: March 29, 2024 at 8:16 AM


Topic: Glass Breakage Sensors and Range Check

Posted By: deepinit
Subject: Glass Breakage Sensors and Range Check
Date Posted: October 24, 2005 at 8:46 PM

I wanted to put a glass breakage sensor in alarm/remote start but I was wondering,  when the car starts will it set off the glass sensor?

One more question for anyone that knows this one...

Exactly how does the "Out of Range Check" work on an Autopage RS-855 in alarm feature "B" programming?  Will it drain my batteries?




Replies:

Posted By: infinkc
Date Posted: October 24, 2005 at 9:32 PM
for the glass sensor, most use a microphone to detect the sound of the glass breaking. you can disable the sensor if wired right when the car is started.




Posted By: mrcllusb
Date Posted: October 25, 2005 at 3:06 AM
But there should be no need to disable the glass sensor.I know the dei sensor only goes of it the microphone hears a certain frequency..(either breaking glass,or the attempt of trying to break the glass with lets say a piece of ceramic like from a spark plug or something.}

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"ole blake"




Posted By: deepinit
Date Posted: October 25, 2005 at 7:10 AM

mrcllusb wrote:

But there should be no need to disable the glass sensor.I know the dei sensor only goes of it the microphone hears a certain frequency..(either breaking glass,or the attempt of trying to break the glass with lets say a piece of ceramic like from a spark plug or something.}

Yup, I am putting in a DEI Glass Sensor, so no additional relays or anything special, great to know. 

Now if someone knew the answer to the other question....





Posted By: mrcllusb
Date Posted: October 25, 2005 at 7:37 AM
As far as ur other question,sounds to me like it's just to see if the signal between the remote and the brain can still signal each other..

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"ole blake"




Posted By: mrcllusb
Date Posted: October 25, 2005 at 7:37 AM
What does the manual say??

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"ole blake"




Posted By: deepinit
Date Posted: October 25, 2005 at 8:05 AM

The install manual only informs you that "ON" is two chrips, "DEFAULT" is one chirp.  The owners manual states that the indicator on the remote will indicated if in range (showing) or out of range (not showing).  However if i go fifty miles down the road away from my car the remote still states in range (GOOD GOD THAT"S GREAT RANGE) until I hit a button then the indicator disappears (Cr@p).

What I wanted to know was how does this range check work?  Does it send out a constant signal to the remote and when the remote is out of range it will indicate as such, and when back in range will it immediately indicate that?  Or does it send out a signal every hr. to determine if its in range (not to useful if the case).





Posted By: dualsport
Date Posted: October 25, 2005 at 8:29 AM
I don't know if it's the same in your case, but in a standalone pager unit I have, the range check is implemented by a periodic range check transmission occurring every 15 seconds for 5 minutes after it's armed. This gives you time to walk to your test location, and the display shows you if it's picking up the transmissions during the 5 minute test period. After that test period, it just goes into the normal standby mode.

I assume the paging range is much longer than the range that you can control the unit using your remote, though no one ever mentions that- I doubt they would use a two way handshaking kind of scheme, it'd be rather pointless.

The important range is the paging range, not the remote control range. I was interested in finding out the range from the Astra 777 unit, but there doesn't seem to be much experience with it here, being sort of an off brand, I guess.




Posted By: deepinit
Date Posted: October 26, 2005 at 7:22 AM
I think i'll turn it on and see what happens...




Posted By: dualsport
Date Posted: October 26, 2005 at 9:30 AM
You get to be the pioneer in this department- posted_image




Posted By: Teken
Date Posted: October 26, 2005 at 5:54 PM
In the automotive scene, there are no longer any units which actually measure the (frequency) of broken glass. All of so called glass sensors simply pick up sound waves.

Now if it was a infrasonic, ultrasonic sensor, that would be different.

With respect to measuring the sound of breaking glass with a porcelin / ceramic tipped object, the sound is not the same, and the said sensor would also not detect such a breakage.


Regards

EVIL Teken . . .

-------------
Knowledge is power. But only if you apply that knowledge in a positive way, which promotes positive results in others.

EVIL Teken . . .




Posted By: deepinit
Date Posted: October 26, 2005 at 8:55 PM

Teken] wrote:

n the automotive scene, there are no longer any units which actually measure the (frequency) of broken glass. All of so called glass sensors simply pick up sound waves.

Now if it was a infrasonic, ultrasonic sensor, that would be different.

With respect to measuring the sound of breaking glass with a porcelin / ceramic tipped object, the sound is not the same, and the said sensor would also not detect such a breakage.

Regards

EVIL Teken . . .

OK, so I am thinking that the DEI 506t Glass Sensor will trip under any sound like an engine starting or a radio playing.... is this correct?

On range (when I turned on range check) it just seems like the remote eventually reflects that its out of range where as before it would always reflect it was in range until a button is pressed.  I have yet to time the duration, but at this point its still inconclusive... more to come...





Posted By: Teken
Date Posted: October 27, 2005 at 5:50 PM
During a RS, most alarms bypass all sensors, except the ignition, hood, door, and brake pedal while the RS is armed.

To answer your Q, yes the sound of your engine could set it off, or any other noise(s) the sensor deems a threat.

Many systems ask the installer to rattle a set of keys on a ring, while others ask the installer to rap on the window to see the LED on the sensor, trip / activate.

Now, you dont have to be a genious to realize that neither procedure emmits the sound of broken glass.

So, in conclusion . . . Nothing wrong with having layers of protection, but dont get caught up in the hype that this device will detect the sound of broken glass, because it wont.

Regards

EVIL Teken . . .

-------------
Knowledge is power. But only if you apply that knowledge in a positive way, which promotes positive results in others.

EVIL Teken . . .




Posted By: dualsport
Date Posted: October 27, 2005 at 6:13 PM
They may be set up with at least some frequency discrimination, so it might be more sensitive to the higher frequencies which tend to be characteristic of breaking glass. The goal is that it's less sensitive to rumbling thunder or loud exhaust rolling by.

Can't be a foolproof scheme though, because sound in real life is made up of a continuous spectrum of frequencies, so loud sounds can exceed the threshold and set it off even if it's not breaking glass.





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