CN2514437Y - Intelligent anti-theft alarm - Google Patents

Abstract

The utility model provides a novel displacement/vibration intelligent alarm by using a single chip. On the external structure, the back of a housing of the utility model is provided with a plurality of small columns besides a sound making hole, and thereby the utility model can be supported on the contact face and is spaced with the contact face. The sound effects of the sounds from the sound making hole can be enhanced by making use of the echo effect, at the same time, the utility model can avoid that a thief puts a hand over the sound making hole on the back of the alarm. On the circuit, by using the single chip and program design, and based on realizing the function uniformity, the utility model simplifies the circuit, and also results in that a piezoelectric ceramic not only can have the action of buzzer, but also can be used as a vibration inductor.

Description

Intelligent anti-theft alarm

(1) technical field

The utility model relates to a kind of burglar alarm that is applicable to various door and windows, especially a kind of intelligent anti-theft alarm.

(2) background technology

Existing door window antitheft alarm roughly is divided into displacement alarm that detects Door-lock bolt and the vibrations alarm two big classes that detect the door and window vibrations, the alarm of these two big classes, otherwise simple in structure, function singleness, otherwise function is complete, but complex circuit is not easy to maintenance.

(3) summary of the invention

The utility model proposes a kind of displacement/vibrations intelligent anti-theft alarm novel, that use single-chip microcomputer at the deficiency of existing alarm.The utility model comprises vibration signal amplifying circuit, warning circuit, piezoelectric ceramics (hummer).

On circuit, the utility model utilizes the power of single-chip microcomputer, by programming, realizing on the unified basis of function, not only simplified circuit, and made piezoelectric ceramics not only have the effect of hummer, can also be as Shock inductor: the vibration signal amplification circuit output end be connected with single-chip microcomputer with the warning circuit input end, vibration signal input single-chip microcomputer sends alerting signal to warning circuit by single-chip microcomputer.When piezoelectric ceramics is sensed sound field variation (vibrations), can produce faint induction current, by the induction current amplifying circuit induction current is amplified, be input to a certain designated port of single-chip microcomputer, pass through software instruction, specify the another port to send the high level of certain frequency, amplify by signal amplification circuit, drive warning circuit, make piezoelectric ceramics (hummer) send very brief alarm sound, single-chip microcomputer timing on one side simultaneously, continue to wait for the induction current input on one side, as the induction current input is arranged at the appointed time, confirm as through judgement and be not undesired signal, then judged whether the displacement signal input again, if there is not displacement signal, then drive warning circuit and report to the police,, then remove and report to the police if displacement signal is arranged; If single-chip microcomputer does not have the induction current input in the middle of timing course, then single-chip microcomputer judges that previous induction current is a undesired signal, recovers holding state.

Externally on the structure, hummer of the present utility model is towards the back side of shell, on the back side of body case of annunciator except that vocal hole is arranged, also have several little pillars, alarm is supported on the surface of contact, and separates a slit, utilize echo effect with surface of contact, can strengthen the effects,sound of the sound that sends from vocal hole, can prevent that the burglar from covering the vocal hole at the alarm back side with hand simultaneously.

(4) description of drawings

Fig. 1---the utility model circuit theory diagrams

Fig. 2---the utility model external structure

Among Fig. 1, S1 is standby displacement detection switch, can use tongue tube, S2 is a password input key, can the double as displacement detection switch, and JP1, JP2 connect the two poles of the earth of piezoelectric ceramics (hummer), wherein the JP2 end has ground connection, also have the stabilivolt D1 of a polarity to JP2 between JP2 and ground wire, T1 is a transformer, and T1 and Q1, Q2, R1 form warning circuit jointly; Among Fig. 2, the 1st, alarm box body, the 2nd, the displacement detecting head password input key of holding concurrently, the 3rd, vocal hole, the 4th, little pillar.

(5) embodiment

The utility model preferentially uses PIC508,509 single-chip microcomputers, and other circuit part is all around single-chip microcomputer.Utilize the output input state of this each port of type single-chip microcomputer and relation each other thereof all by the characteristics of programming Control, the characteristic that sound field changes during utilization piezoelectric ceramics induction vibrations, by at transformer T1 with connect between the port JP2 of piezoelectric ceramics and add a stabilivolt D1, utilize it unidirectional every directly, make the induction current of its generation can only amplify the GP2 port of back input PIC508 through triode Q3, this port is imported as vibrations; Displacement switch S2 inserts the GP1 port of PIC508, and the GP1 port is an input port, is changed to the input of displacement and password.

The utility model is in holding state earlier, utilizes whether the state of displacement switch decision gate is " pass " again, as not being " pass ", then reports to the police 2 minutes, does not shut yet as door after 2 minutes, and then decision gate stops to report to the police for deliberately opening; When the door state was " pass ", the utility model was in holding state, opened before the door, should clout door earlier, and to vibration signal of the utility model input, if there is not the vibration signal input just to detect displacement signal in advance, then the utility model is reported to the police at once; After the utility model detects vibration signal, pick up counting, in official hour, if continue to detect vibration signal and detect displacement signal, then the utility model thinks that door opened by the human key, will not report to the police, and whether the state that recovers holding state and detecting gate is " pass ", the stipulated time inside door is not shut, the utility model prompting that will pipe; If time of overshoot does not detect the vibration signal input, then the utility model thinks that the vibration signal of front is an improper undesired signal, will not report to the police and recovers holding state; If the time of overshoot does not detect the displacement signal input, then the utility model judges that just the someone attempts " forcing open the door ", the beginning alarm; As open before the door to vibration signal of the utility model input, promptly the utility model has just detected displacement signal for detecting vibration signal, the people is arranged " forcing open the door ", alarm at once that then the utility model is thought; After the utility model begins to report to the police, can press displacement switch, the input password is removed and is reported to the police.

For realizing above thinking, the circuit theory diagrams that the utility model uses as shown in Figure 1.Among Fig. 1, triode Q3 base stage meets JP2, collector meets JP2 by biasing resistor R3, grounded emitter, when being in holding state, triode Q3 plays by effect, when induction current is imported, triode Q3 amplifies induction current and be transferred to the GP2 port of PIC508, by software instruction, specifies the GP5 port to send the high level of certain frequency, amplify by signal, drive warning circuit, make piezoelectric ceramics (hummer) send very brief alarm sound, PIC508 single-chip microcomputer timing on one side simultaneously, continue to wait for induction current input on the GP2 port on one side, as GP2 port at the appointed time the induction current input is arranged, and displacement signal is arranged from the input of GP1 port, then standby again; Do not have the induction current input as GP2 port at the appointed time, then the PIC508 single-chip microcomputer judges that previous induction current is a undesired signal, recovers holding state; As GP2 port in the fixed time induction current input is arranged, and the GP1 port does not have the displacement signal input, then the PIC508 single-chip microcomputer judges that having the people forces open the door, the driving warning circuit is reported to the police, if the GP1 port has the displacement signal input in the fixed time, then the PIC508 single-chip microcomputer judges it is normal door, recovers holding state.

Externally on the structure, as shown in Figure 3, piezoelectric ceramics of the present utility model (hummer) is towards the back side of shell, except that phonate hole is arranged, also have several little pillars on the back side of body case of annunciator, alarm is supported on the surface of contact, separate a slit with surface of contact, utilize echo effect, can strengthen the effects,sound of the sound that sends from phonate hole, can prevent that the burglar from covering the phonate hole at the alarm back side with hand simultaneously.

Claims (1)

1. A kind of intelligent anti-theft alarm comprises vibration signal amplifying circuit, warning circuit, and piezoelectric ceramics (hummer) is characterized in that: 1. piezoelectric ceramics places the alarm back side, and the alarm back side is provided with phonate hole and some little pillars.2. the vibration signal amplification circuit output end is connected with single-chip microcomputer with the warning circuit input end, and vibration signal input single-chip microcomputer sends alerting signal to warning circuit by single-chip microcomputer.

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