Statistics say that the first case of auto theft occurred in 1896, only a decade after the launch of the first vehicle to gasolina.Alguns studies indicate that a vehicle is stolen every 20 seconds.
In light of these statistical results is not surprising that most owners have invested in their alarms for veículos.Neste article I will try to explain a little of the operation of these alarms.
How Alarms Work
If you think a simple way, an auto alarm is nothing more than a set of sensors connected to an alarm central.O simple as you can imagine is to connect the switch port to a siren, so whenever someone to open the tocar.É siren begins to clear that most modern alarms are a bit more sophisticated than this example.
A set of volumetric sensors, shock or movement.
* A siren in many brands can even simulate different sounds.
* A radio receiver in order to receive information from the command .
A set of batteries that allow the alarm to remain operational even if the power is cut.
* A central computerized monitors that all information and makes it sound the siren.
Central alarm
The center of the latest auto alarms are authentic mini computadores.A its function is to verify that all switches that activate the alarm are closed, sends electrical signals to the lights when the alarm on or off via the command, is sounding the siren when a sensor is activated (the volumetric sensors in case of broken glass), also have a memory that tells you in the event of attempted theft which of the sensors activated.
In many models, the switch is connected to the main battery of the vehicle but have a rechargeable battery backup.A support comes into operation when the general power cables are cortados.Como cutting power indicates a possible robbery, center immediately utters sirene.Estes models are often known as self powered alarm.
Door Switches
The most basic alarm system is the auto switch portas.Nos modern vehicles used if the original system to inform the alarm that a door was opened.
Basically it works like the light of your refrigerator when you open the door the light turns on when you install an alarm if the connection is made to this existing circuit so that the information is sent to the central alarm.
The door switches are quite effective, but unfortunately offer protection limitada.Existem other ways to get in a vehicle (breaking windows), and any car thief can steal a vehicle without even entering it (can tow it).
Motion sensors
Many car thieves do not seek the entire car, may be looking for a specific peça.Muitos these thieves do their "work" without even opening a door or break a vidro.Existem many reports of vehicles stolen using a trailer.
In order to protect this type of theft, almost all alarms have the ability to attach a motion sensor, commonly known as "tilt sensor", the basic operation of this sensor consists of a small cylinder with a sphere of mercury and two electrical contacts.
Mercury is a liquid metal conductor of electricity, so the small cylinder mercury is always in touch with one of the links and when the vehicle moves it moves making contact with another link to the central alarm indicates an attempt to drive vehicle.
Volumetric sensor
Most of the time the car thieves have little time to rob a car, and so do not waste time trying to open a door, choose the easiest way is from an alarm system vidro.Um modern self has to detect this type of intrusion.
The most common sensor to detect breaking glass consists of a microphone connected to the central measuring the change in air pressure and converts it into electrical signals eléctricos.Os signals are filtered by a crossover that is configured for a particular frequency, thus only the frequency of breaking glass will activate the alarm sounds and the other ignored.
I hope this article helps you understand a little better how the auto alarm.
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20 Comments on "How the auto alarm"
Motion sensors, like to know where I can buy and how much it would cost me. tb would like to know if I can connect it to an alarm cobra k is ok I have mounted on my vehicle. thanks
You can connect any type of motion sensors to your alarm charges if they have a negative output (to avoid more complex setups with inverter).
This blog is not connected to any official representative of the brand and why do not you can give specific prices, search for homes in the specialty, you will surely find many prices may indicate the material and its assembly.
Thank you and come back whenever you want.
I wonder if I can make a command to send alarm "Cobra" because he bought a used car but did not have the command (lost)? Abrx
Try to see which model of your alarm. You may have to send the central technical services to encode new commands.
But there is always possibility of acquiring commands without having to change the alarm.
If you need help check back often.
Thanks
Friend Thank you for not having anyone "close" refers here, I know that the box (perhaps the central q speech) has the number 53 ... I forgot now, is a car of the year 2000 and is a Fiesta TDdi, as I have few possessions but I like to preserve what little I have q, q, or do I go for the least expense, and if you can stand here in the port area there will be some place that I recommend checking the saying? Abrx
Oops this watch ñ XTA right, XTA an hour late!
Jorge,
If you have the pin code , and try turning off the alarm button that is on the LED.
If it's working, just order a command and program it as described in the respective post.
If you have any problems with the pin code says.
No longer.
Paul Friend, card w / pin ñ have, but I have a key "snake" with a small 4 / 5 characters because k is an initial expense seems (?/!) a letter and four digits will be told the code? And I have bunch of keys still in the two "clamps" plastic w / a cat of a letter and six digits, or will this be? Abrx and good trblh
Ñ want to be boring but thanks a lot for your help ...
I will send a response by mail.
I installed the alarm charges to approximately 05 (five) years and has since had no problem, except to about 03 (three) months where the two controls / mugs come in here and making trouble Lavras / MG, there's nobody that install this alarm, never had problems with that, so what I would check with you if you have someone or some store that has this control and can give me, because if the alarm is working and unacceptable that I change the alarm because of the control, and even more if I'm satisfied with the product, as I would like to know if you have somewhere that messes with this brand of alarm and control has to provide, if not already possess that makes the alarm if you have any others that may acquire and thereby you exchange with this and so I look to improve a position and I thank you for answering me.
Good afternoon
Check the pile of commands and in case of replacement of the command resets it by following the instructions of the article replace the battery and program the command .
Tell me if it worked.
Cumps
Thanks for the info.
I would like to have charm to note that the accents in "to the" all around.
"In light of these ..."> "To ..." etc., etc., etc..
Thank you for not taking me the wrong way
Mary
Thanks for the reminder.
WOULD LIKE TO KNOW WHERE CAN I ADEQUERIR AS THE NEW LED-IF ... BLEW MY NEEDED WITH ALL WIRE LED ..
PFF RESPOND TO THE EMAIL IS URGENT
It is possible, I will briefly on the online store.
We are in the updates.
I have a cobra alarm 5801, ref.4B58105TB, I would have the circuit diagram of the electronic module (center) and mounting.
Hello I have a question about the alarm cobra model 368 G have a Fiat Scudo 2008 that enjoyed the key utelizar of origin but also wanted the windows up and the retrovizores fechasem retrovizores Shut the key to the origin but not the glasses and possibly the pole when the alarm fossionar and connected THANKS
3868 instead of 4615 is advisable.
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