Connecting a shock sensor to an alarm system. Shock sensor

Report on installing a shock sensor on Vesta:

I bought a two-core wire of 5 meters, corrugations, an Alligator PS302 shock sensor and a 5-pin relay. The sensor has four inputs: red “+”, black “-”, green “warning zone” (this is when the alarm does not scream, but beeps) and blue - “alarm zone” (this must be connected to the limit switch).
I wanted to connect +12V to the ignition, but after disassembling it, everything fits so tightly there that I decided to connect it better on the VSM block.
Having removed the glove compartment, immediately behind it is the VCM unit, which is attached to one nut 8. There it was connected, red 12 volts constant, inserted a 5A fuse and connected a signal to the shock sensor from the driver's door switch on the black connector to the orange wire.

If you need more detail on how to connect, then there is a video on the Internet showing how to install an alarm on a Lada Vesta, that’s where I got my knowledge)
Next, I disassembled the panel and connected the plus from the cigarette lighter, ours is red.

Next, I wrapped the corrugation with model material and tied it with ties to the location of the shock sensor.
The sensor was located behind the glove compartment, it turns out to the left of the upper corner. But first, I connected everything according to the diagram and then collected it in a pile, covered it with model plastic so that the corrugation would not creak, etc.

Yesterday during the day I went and set the sensitivity on the sensor, on a 100-point scale, I set it to somewhere around 85. The pain won’t be enough for the back of the car, but with a small impact with your hand, the alarm goes off with a bang) Attach the impact sensor quite rigidly, and then if it is in a suspended state, so to speak, it can work just like that, without reason, from the slightest hesitation.

Almost every security system Cars and modern car alarm brands are now equipped with a security sensor or, as it is commonly called, a shock sensor. It is necessary to timely notify the owner of any external influences to his vehicle. Today we will discuss where to install the shock sensor.

Study modern car alarms http://radar-detector-expert.ru/autosignalizacii of famous brands that have proven themselves excellent among car enthusiasts. These days, almost every car is equipped with an auto alarm and there is a wide choice of prices and functions of these devices.

These devices differ only in their physical principle, but they have the same operating algorithm: when they detect extraneous movements towards the machine, they send a signal to the system.

On this moment There are two main opinions regarding the location of the shock sensor in the car. Where to install the shock sensor - supporters of the first argue that the shock sensor should be installed using metal parts bodies that have a rigid and durable attachment to the surface of the car itself.

Their opponents are confident that this option is unacceptable, since iron dampens the amplitude of vibration and thereby worsens the quality of the device’s operation; the shock sensor’s response to external influences weakens.

Even adding sensitivity in the settings to the device will not solve this problem, because in this case it will go off at the slightest sound and disturb the owner over trifles. Where to install the shock sensor - as an alternative, it is proposed to install the shock sensor on the wiring harnesses, where plastic clamps will serve as fasteners.

Some car service workers prefer to mount the shock sensor in the center of the cabin. vehicle, considering this place the most suitable. This action is not without meaning, since when located in the middle of the car, the shock sensor provides optimal sensitivity to external influences on all parts of the body. The most important thing here is that the device is firmly installed.

Recently, the shock sensor began to be mounted on the alarm board. This solution is the most profitable in material terms, but its effectiveness is noticeably reduced. This happens because it is almost impossible to find a place for such a device that will be inaccessible to burglars.

Where should I put the shock sensor? We can conclude that the shock sensor needs to be installed where it will stably provide signals without false reactions during loud sounds, strong winds and other external influences.

The impact sensor reacts to the impact of the car body from the external environment. Typically, the sensor is included in common system alarm and is configured when it is first launched. Many experts recommend installing a shock sensor on a metal part of the body inside the car.

Moreover, this must be done so that the sensor is located symmetrically relative to the axis of the car. Shock sensors should not be installed on the bottom of the car, as it can be triggered by resonant vibration of the body due to the fact that a car passes nearby. It is also not recommended to install the device on plastic parts of the machine. This will reduce the sensitivity of the sensor. The most best space for installing the sensor - this is a shield between engine compartment and between the car interior. Choosing a good shock sensor for a car is more difficult than choosing ankle boots, so be careful when purchasing. Check that the device is working properly and ask the seller to test it for you.

The shock sensor has four wires. It is connected to a special four-pin connector of the main alarm unit. In the factory configuration, the sensor itself is glued to metal parts of the body using double sided tape. But many motorists still prefer to attach it to the car using special fasteners with self-tapping screws. During installation, the sensor can be adjusted using resistors manually, which are available on the sensor panel. Each resistor plays its role. One is responsible for warning about physical force, the other gives a signal when there is a strong impact on the car.

Both sensors must be unscrewed all the way (to zero). After this, gradually increase the sensitivity of the warning zone. After setting the warning sensitivity zone, proceed to setting the alarm sensitivity zone. It is configured in the same way as the first, only in the second you need to add a few more revolutions.

Once done, close your car door and set it to alarm. After this, check the car for sensitivity: hit it lightly on the body. It is better not to knock on the roof, doors and hood, as dents may remain. If the sensitivity turns out to be low for you, then tighten the resistors a couple more turns.

Correct shock sensor setting alarm plays important role when operating a vehicle. If the crash sensor is not configured correctly, the vehicle will either respond to false alarms or not respond to real ones. To configure the shock sensor, you can contact service center, or you can perform this operation yourself.

Setting up the shock sensor Most often it is required if the alarm system is too sensitive: it reacts to passing cars, thunderstorms, etc. And sometimes it happens the other way around - the car does not react even to strong impacts on it.

To adjust the alarm sensitivity, you need to find the location of the shock sensor. Most often it is installed under the instrument panel. If you don't know where it is, it's best to check with your alarm installer.

Modern alarm systems are most often equipped with a two-level shock sensor. The first level is triggered when there is a slight impact on the car body or wheel; in response, the alarm emits a short beep and sends a warning to the alarm key fob. The second level is triggered when there is a strong impact on the car, and a continuous sound signal is activated.

To adjust the sensitivity of each level, the shock sensor has adjusting screws.

To find out which screw corresponds to which level, there are lights opposite them, which are operation indicators. If you lightly tap the sensor, only the first level signal will turn on (the green light in our case). If you knock harder, the second light, corresponding to the second level, turns on.

The direction of rotation of the screws is marked with + and - signs. When turned clockwise, the sensitivity increases, counterclockwise - decreases.

To work, you need a flat-head screwdriver of the appropriate width.

We start setting up from the first level of the shock sensor. By turning the screw counterclockwise, we set the sensitivity to minimum.

After this, we increase the sensitivity a little, lock the car and put it in security mode.

We wait until the alarm goes into security mode (on some cars this happens with a delay of 30-40 seconds), and then we try to lightly hit the body. It is better to strike in the middle part of the body, in the area of ​​the central pillar.

A small impact should trigger the first level of the shock sensor and the alarm should emit a short warning signal. If the shock is too strong to trigger, reopen the car and again add sensitivity using the adjusting screw.

Thus, we configure the first level as we need. Then we move on to setting the second level. Here everything is done in the same way, but it should trigger with a stronger blow.

Having adjusted the sensitivity of both levels, we check the reliability of fastening the shock sensor to the car. Insecure mounting may cause false alarms. If everything is fine, then we enjoy the work done.

A shock sensor is, in ordinary words, a shock sensor, in British shock sensor, it is installed on virtually all security systems, the sensors completely take control of the perimeter of the car body and react to it at the slightest impact. The sensor must have a balanced " nervous system“, he needs to have sufficient sensitivity to shocks and touches to the car, but at the same time not yell because of any rustle, for example, thunder or a car passing nearby.

So that the sensor can distinguish between true impact and impacts,
from incorrect and random interference, now they are made “smart”, which have
dual zone control. If a blow, even a light one, took place, then
The alarm should give a brief audible warning. In this way,
the villain or the random culprit will learn that the car is guarded and
the influence cannot be continued.

When strong blows, in case of an accident, do not
authorized towing, burglary or breaking of glass, an alarm will sound
alarm and works established scheme, at a certain interval
time. It is specifically to distinguish between such strikes that the system was developed
dual-zone recognition.

In order for the sensor to be able to correctly recognize impacts and
influence, it contains such a detail as an element of sensitivity, which
having received the impact, processes its strength and converts it into a signal with
a certain sound. The sensitive elements themselves are various types, V
Depending on what recognition mechanism they have, there are three types:

• microphone;
• electrical;
• piezoceramic.

In addition, there is also additional options sensitive
parts that, due to the complexity of the design and the high price, were not
needed. For example, an LED in an elastic suspension that works in conjunction with
photodetector. There is also a sensitivity element using the Hall effect.

Electric
sensor

At the moment of impact on the body, a supervisor works here
a magnet, which is mounted on an iron spring, begins to
hesitation. Due to oscillations, an electrical signal appears in a multi-turn coil,
The systematization of the blow depends on how strong the signal was received. Such
sensors are very popular and are often installed in car alarms,
because they are quite clear and at the same time ordinary and trouble-free.

Piezoceramic
sensor

In sensors of this type, the main work is done by
the installed sensitivity element is a piezoplate, which still has
small load. The advantage of such an element is that it is not affected by
no electrical interference, as a minus it should be noted that it is very huge
dimensions of the final product.

Microphone sensors

In this case, a sensitive electret microphone
a special rubber cap is put on; the cap has a brass sinker.
The microphone is very sensitive and detects air pressure under the load. When
the load fluctuates, it freezes how strong the impact was on
body. The advantage is that such a sensitive element is not subject to
multiple acoustic interference.

Sensors digital and
analog processing

These are the latest achievements that have begun to enter the world
car alarms are comparable not so long ago. Here for processing
Incoming signals from a sensitive microprocessor are used by the processor.
Using this technology, you can finely tune any area of ​​the body to suit
a certain sensitivity, and this adjustment is made using
keychain Naturally, a modern microprocessor can more accurately process
received signal and determine whether it is necessary to raise an alarm or not, i.e.
it uses a logical computer processing circuit.

Shock sensors:
installation and efficiency

Regarding shock sensors and their placement on the body
car, the ideas of professionals are not only divided, but even contradict each other
to a friend. The problem is that some insist that sensors should
be installed only on very strong body parts, only on
iron, they must be secured to the body and not succumb to any outside influences
fluctuations. The second half of professionals talk about the opposite, they say that the big
part of the amplitude is taken directly by the iron, so the sensor cannot produce
correct data. Apparently this is why sensors are very often incorrect and weak
react to strong influences. But you can’t increase the sensitivity level,
because false positives will become more frequent. To solve this problem
specialists of the 2nd group propose strengthening sensors for various foreign
fastenings that will be strong, but at the same time will be able to accurately reflect the data,
for example, clamps, harnesses, plastic ties, etc.

There are even such miscalculations that the most average
the location where the sensors are installed is right inside the car, and specifically in the middle,
This is justified by the fact that in the middle of the cabin the sensor is equally sensitive to
influences on any element of the body. In this case, the most important thing is true and
securely secure the sensor to prevent accidental activation.

There is also innovation with the installation of a sensitivity sensor
- directly to the signaling board. If you look at it from an economic point of view,
then this is an ideal solution, because inexpensive. But from a technical point of view, well,
From a security point of view, this solution is not entirely correct. It's getting very difficult
find a place to install the board that is safe and difficult for thieves to reach. Not to mention
In addition, you need to keep in mind that the board should be placed where it is normal
will produce sensitivity signals. For the basis for choosing a place for
When installing a sensor, several fundamental criteria must be taken into account. Firstly,
the sensor must be very measured and clear to any external
impact, secondly, there should be no false positives such as from lightning or
cars passing by.

Correct setting
sensors

Through lengthy checks and information collection, we developed
two valid and effective types of correct sensitivity option when
The sensors work very well and without failures:

• auto;
• personal tests.

In the first case, everything happens at the hands of the driver or
specialist, i.e. The alarm is set to neutral training
mode, after which shocks or impacts are created in various parts of the body. In these
moments the processor memory remembers everything, frequency and intensity, ultimately
in the database collected there is a precise division into high and low impact impacts.
But everything is not so sweet here, the fact is that the blow is processed and recorded, but in different
parts of the body, such an impact will be processed differently by the sensors, and the signal
The messages will also be different and there will be many incorrect signals or omissions. Here,
for example, when hitting a wheel in training mode, the sensor accepted it as weak
blow, and the same blow to the body it can take as strong and work
signal. With the same success, the alarm may incorrectly receive a weak
signal, but in reality it will be a hack.

As for the second method, this is a personal approach with
multiple and painful trials and errors. For this purpose the alarm is again
is set to training mode, but tapping is not limited to one
hitting one part of the body. On the contrary, blows are delivered to various parts so that
the processor processed and remembered as much as possible more options and then I could
elect right action. In this case, the choice of sensitivity is not made based on
based on sensors, specifically alarm systems. The work is complicated by what is needed
work shocks and signals for both alarm zones, for warning and
separately for anxiety. This is naturally the clearest way, but requires more
labor and time.