What Are Car Alarm Sensors and How Do They Work?

ar-alarm Alerts

A Neo mini siren, hidden inside a vehicle's front fender
PHOTO COURTESY DIRECTED ELECTRONICS
­ In ­the previous sections, we looked at the various sensing devices that tell the alarm system's brain when something disturbs the car. No matter how advanced these systems are, the alarm system isn't much good if it doesn't set off an effective alarm. An alarm system must trigger some response that will deter thieves from stealing your car.
As we've seen, a lot of the devices that are already built into your car make for effective alarm signals. At the minimum, most car alarm systems will honk the horn and flash the headlights when a sensor indicates an intruder. They may also be wired to shut off the ignition starter, cut off the gas supply to the engine or disable the car by other means.
An advanced alarm system will also include a separate siren that produces a variety of piercing sounds. Making a lot of noise brings attention to the car thief, and many intruders will flee the scene as soon as the alarm blares. With some alarm systems, you can program a distinctive pattern of siren noises so you can distinguish the alarm on your car from other alarms.
A few alarm systems play a recorded message when somebody steps too close to your car. The main purpose of this is to let intruders know that you have an advanced alarm system before they try anything at all. Most likely, a veteran car thief will completely ignore these warnings, but to the opportunistic amateur thief, they can be a strong deterrent. In a sense, it gives the alarm system a commanding personality. On some unconscious level, it may seem like the car's not just a collection of individual parts, but an intelligent, armed machine.
A lot of alarm systems include a built-in radio receiver attached to the brain and a portable radio transmitter you can carry on your keychain. In the next section, we'll see what role these components play in a security setup.
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Avtomobilning old qanotiga yashiringan Neo mini sirena
Avtomobilning old qanotiga yashiringan Neo mini sirena
FOTO BO'LGAN ELEKTRONIKA
Oldingi bo'limlarda biz avtomobilni biror narsa bezovta qilganda signalizatsiya tizimining miyasiga xabar beradigan turli xil sensorli qurilmalarni ko'rib chiqdik. Ushbu tizimlar qanchalik rivojlangan bo'lishidan qat'i nazar, signal tizimi samarali signalni o'rnatmasa, unchalik yaxshi emas. Signal tizimi o'g'rilarni sizning mashinangizni o'g'irlashdan to'xtatadigan ba'zi javoblarni ishga tushirishi kerak.

Ko'rib turganimizdek, mashinangizga allaqachon o'rnatilgan ko'plab qurilmalar samarali signal signallarini yaratadi. Eng kamida, avtomobil signalizatsiya tizimlarining aksariyati sensor bosqinchini ko'rsatsa, signal signalini chaladi va faralarni miltillaydi. Shuningdek, ular kontaktni ishga tushirgichni o'chirish, dvigatelga gaz ta'minotini to'xtatish yoki avtomobilni boshqa usullar bilan o'chirish uchun simli bo'lishi mumkin.

Murakkab signalizatsiya tizimi turli teshuvchi tovushlarni chiqaradigan alohida sirenani ham o'z ichiga oladi. Ko'p shovqin qilish avtomobil o'g'risiga e'tiborni qaratadi va ko'plab bosqinchilar signal chalinishi bilanoq voqea joyidan qochib ketishadi. Ba'zi signal tizimlari yordamida siz avtomobilingizdagi signalni boshqa signallardan ajrata olish uchun sirena shovqinlarining o'ziga xos naqshini dasturlashingiz mumkin.

Kimdir mashinangizga juda yaqin qadam bosganda, bir nechta signalizatsiya tizimi yozib olingan xabarni o'ynaydi. Buning asosiy maqsadi tajovuzkorlarga biror narsani sinab ko'rishdan oldin sizda ilg'or signalizatsiya tizimi mavjudligini bildirishdir. Katta ehtimol bilan, faxriy avtomobil o'g'risi bu ogohlantirishlarni butunlay e'tiborsiz qoldiradi, ammo opportunistik havaskor o'g'ri uchun ular kuchli to'xtatuvchi bo'lishi mumkin. Qaysidir ma'noda, bu signal tizimiga buyruq beruvchi shaxsni beradi. Ba'zi bir ongsiz darajada, bu mashina shunchaki alohida qismlar to'plami emas, balki aqlli, qurollangan mashina kabi ko'rinishi mumkin.

Ko'pgina signalizatsiya tizimlari miyaga ulangan o'rnatilgan radio qabul qilgichni va kalit zanjiringizda olib yurishingiz mumkin bo'lgan portativ radio uzatgichni o'z ichiga oladi. Keyingi bo'limda biz ushbu komponentlar xavfsizlikni sozlashda qanday rol o'ynashini ko'rib chiqamiz.