Anti-theft alarm with active caution function

Abstract

The present invention provides an anti-theft alarm with an active caution function. A circuit of the anti-theft alarm is composed of an active lamplight caution circuit and a sound alarm circuit, the active lamplight caution circuit comprises a 555 integrated circuit U1, resistors R1 and R2, a capacitor C1 and an LED lamp D1, and the sound alarm circuit comprises an HC-SR501 human body induction module U2, an LM358 operational amplifier U3, resistors R3, R4 and R5, an NPN triode Q1 and a buzzer BUZ. The anti-theft alarm is installed on a balcony, when no thief invades from the balcony, the anti-theft alarm flicker constantly via the LED lamp, thereby playing a part in warning other people actively. If a thief invades from the balcony, the anti-theft alarm also can sound out by the buzzer, thereby realizing the dual effects of frightening the thief and alarming. With the active caution function, the anti-theft alarm can warn the thief by the lamplight in advance and can frighten the thief, thereby enabling the thief to give up the stealing idea actively.

Description

technical field [0001] The invention relates to an anti-theft alarm, in particular to an anti-theft alarm with an active warning function, belonging to the technical field of applied electronics. Background technique [0002] In cities, many people work far away from home, and it is normal to go out early and return late. Therefore, in order to protect family property and prevent thieves from burglarizing from the balcony, many families have installed burglar alarms on the balcony. Anti-theft alarms in the market are usually required to be installed in a hidden place to prevent thieves from finding out. This kind of concealed anti-theft alarm can only be used to detect the intrusion of thieves and then call the police, and cannot produce active warnings. Leave after stealing quickly, so we hope that this kind of alarm can have an active warning function, that is, to clearly warn the thief that there is an anti-theft alarm here, so that they dare not easily make a decision t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-theft alarm with an active warning function to solve the problem that the traditional anti-theft alarm does not have an active warning function

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