Simple car security devices. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Security devices and alarms
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This section deals with car electronic security guards, which have sufficient versatility, simple design and practically do not require adjustment after installation. In armed mode, these devices consume a small current, which allows using a standard battery as a power source.
These security devices can be used as temporary security devices by new car owners until a more sophisticated modern alarm system is purchased or manufactured.
The car security device is assigned to perform two main functions: registering the fact of opening one of the doors of the car interior, engine compartment hood or trunk lid and registering the fact of rocking the car body. Of course, they do not ensure the safety of the car as a whole, but only signal the state of the car under the influence of unauthorized persons, for example, when trying to remove a wheel or roll the car to a new place without turning on the engine.
The car security device should warn others that the car is under protection. This will force them to bypass your car. For these purposes, you can use an LED indicator mounted on the inside of the windshield or in a prominent place on the dashboard. The LED indicator can be made on a single chip such as K561LN2 or K561LA7. The LED indicator (Fig. 1) consists of a multivibrator assembled on a DD1 chip and an HL1 LED. When the supply voltage is applied, the multivibrator generates a periodic sequence of rectangular pulses with a frequency of about 1 Hz, which turn the HL1 LED on and off.
Ris.1
Figure 2 shows a schematic diagram of an LED indicator with alternate switching on of LEDs HL1 and HL2.
Ris.2
The switching frequency of the LEDs is determined by the values of the frequency setting circuit of the multivibrator on the elements DD1.1 and DD1.2 - the resistance of resistors R1, R2 and the capacitance of capacitors C1, C2. With the ratings of these elements shown in the diagram, the switching frequency of the multivibrator is 1 Hz.
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