CN202563624U - Intelligent alarm - Google Patents

Abstract

Disclosed is an intelligent alarm. The problems that the structure of existing intelligent alarms is complex, the production cost of existing intelligent alarms is high and existing intelligent alarms are difficult to popularize and apply in families are solved. The intelligent alarm is characterized by comprising a pyroelectric infrared detector, a telephone line interface circuit, a dual-tone multifrequency (DTMF) transmit-receive module and a voice module, wherein an alarming signal output end of the pyroelectric infrared detector is connected with an interrupt request signal input end of an AT89S51 single chip microcomputer, an off-hook control signal output end of the AT89S51 single chip microcomputer is connected with a triggering signal input end of the telephone line interface circuit, and the simulated off-hook is achieved; a dialing control signal output end of the AT89S51 single chip microcomputer is connected with a triggering signal input end of the DTMF transmit-receive module; and a control signal input end of the voice module is connected with a voice drive signal output end of the AT89S51 single chip microcomputer, and a drive signal output end of the voice module is connected with a drive signal input end of a loudspeaker. The alarm has multiple functions and low production cost and is suitable to intelligent home safety protection.

Description

A kind of intelligent alarm

Technical field

The utility model relates to a kind of intelligent alarm device that is applied in family's safe protection engineering.

Background technology

Along with improving constantly of rapid development of social economy and living standards of the people, people are also increasingly high to the requirement of its dwelling house, show not only to hope to have comfortable, warm residence, and also had higher requirement in security, aspect such as intelligent.The condition of public security is very severe at present, and it is of common occurrence that the robber that enters the room robs case, and the personal injury case that causes thus also happens occasionally.Be to enter the room to steal the multiple season rob case summer, enters the room when the offender often utilizes people to window night to sleep soundly and implement theft or robbery with violence.Along with the deterioration and our the frequent generation of larceny case at one's side of public security situation, how family guards against theft becomes one of much-talked-about topic of people's concern day by day.Traditional home security way is a cage formula theft preventing method, mainly be antitheft door and anti-window net are installed, but obviously, these parts all can't be realized real intelligent anti-theft that therefore, the security system of intelligent dwelling is also arisen at the historic moment.But, at first develop and form because more advanced safety device all is more external bigger companies, therefore, device constitutes often too complicated, and manufacturing cost is higher, often is difficult to apply in common family.Therefore, need a kind of function more complete at present, but the lower domestic safety guard alarm of manufacturing cost.

Summary of the invention

The technical matters of mentioning in order to solve in the background technology, the utility model provide a kind of intelligent alarm, and this kind intelligent alarm function is more complete and manufacturing cost is very low, is applicable in the home intelligent safety precaution.

The technical scheme of the utility model is: this kind intelligent alarm; Comprise AT89S51 single-chip microcomputer, phone and a loudspeaker, its unique distinction is: said alarm also comprises some pyroelectric infrared detectors, telephone line interface circuit, DTMF transceiver module and voice module; Wherein, Be connected to the interrupt request singal input end of AT89S51 single-chip microcomputer behind the alarm signal output ends process pyroelectric infrared detector testing circuit of said pyroelectric infrared detector; The off-hook control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said telephone line interface circuit, to realize the simulation off-hook; The dialing control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said DTMF transceiver module, to realize automatic dialing; The signal input end of said voice module is connected to the voice driven signal output part of AT89S51 single-chip microcomputer, and the drive signal output terminal of said voice module is connected to the driving signal input of said loudspeaker.

The utlity model has following beneficial effect: this kind intelligent alarm is by the detection of infrared eye realization theft alarm signal, and the automatic telephone dialing alarm.When detector detects alert, will send interrupt request to single-chip microcomputer, again by the Single-chip Controlling telephone interface circuit; Realize the simulation off-hook; Realize dialing automatically through the dtmf dialing circuit, and accomplish the good voice messaging of played pre-recorded through phone, realize audio alert by sound circuit; Notify the user that alert takes place, so that let them make corresponding measure timely.Native system is formed by cost minimum infrared eye and single-chip microcomputer structure, and basic shop cost only needs dozens of yuan, and directly through telephone call, therefore, can satisfy the basic need of home intelligence monitoring.Simultaneously, this kind alarm can detect alert through detector, and alarm is highly sensitive, can prevent wrong report; In addition, alarm can realize simulating automatically the dislodging machine; Simultaneously, this alarm dials through DTMF automatically, audio alert.This alarm adopts pay station line as information transmission media, without wireless system in use.Like this, machine receives to disturb few, and rate of false alarm is low, and usable range is broad more.Make full use of the advantage of telephone line, cost reduces greatly.Simplify design simultaneously, improved reliability.Simultaneously, transmit warning message and use voice mode.Voice are briefly clear and definite, can on telephone set, listen to, and are easy to use.

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a circuit diagram of showing pyroelectric infrared detector testing circuit described in the utility model.

Fig. 3 is a circuit diagram of showing AT89S51 single-chip microcomputer described in the utility model and peripheral circuit thereof.

Fig. 4 is a pinouts of showing DTMF module described in the utility model.

Fig. 5 is the circuit diagram of the automatic dial-up circuit that matches with the module of DTMF described in the utility model.

Fig. 6 is the circuit diagram of the sound circuit that matches with voice module described in the utility model.

Fig. 7 is a circuit diagram of showing telephone line interface circuit described in the utility model.

Embodiment:

Below in conjunction with accompanying drawing the utility model is described further:

By shown in Figure 1, this kind intelligent alarm comprises AT89S51 single-chip microcomputer, phone and a loudspeaker, and its unique distinction is: said alarm also comprises some pyroelectric infrared detectors, telephone line interface circuit, DTMF transceiver module and voice module; Wherein, Be connected to the interrupt request singal input end of AT89S51 single-chip microcomputer behind the alarm signal output ends process pyroelectric infrared detector testing circuit of said pyroelectric infrared detector; The off-hook control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said telephone line interface circuit, to realize the simulation off-hook; The dialing control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said DTMF transceiver module, to realize automatic dialing; The signal input end of said voice module is connected to the voice driven signal output part of AT89S51 single-chip microcomputer, and the drive signal output terminal of said voice module is connected to the driving signal input of said loudspeaker.

During practical implementation, adopt pyroelectric sensor in this example as pyroelectric infrared detector.The utilization of this kind sensor be pyroelectric effect, be a kind of responsive to temperature sensor.It is made up of ceramic oxide or piezolectric crystal unit, and electrode is made on two surfaces of element, and when temperature changed in the sensor monitors scope, pyroelectric effect can produce electric charge on two electrodes, promptly between two electrodes, produced a weak voltage.Because its output impedance is high, so there is a FET to carry out impedance conversion in the sensor.The electric charge that pyroelectric effect produced can combine and disappears with airborne ion, when environment temperature is stablized when constant the sensor no-output.When human body gets into detection zone,, then there is signal to export because of human body temperature and environment temperature have difference; If motionless behind the human body entering detection zone, then temperature does not change, and sensor is not output also, so the activity of this sensor ability human body or animal.When human body moved, human body itself just can be launched infrared ray, just in time moved to the sensing range of pyroelectricity detecting device, will send pulse train so, will export a high level through handling at last.The circuit that cooperates with pyroelectric infrared detector is as shown in Figure 2.

Fig. 3 is a circuit diagram of showing AT89S51 single-chip microcomputer described in the utility model and peripheral circuit thereof.Wherein, clock circuit is selected external quartz crystal for use, considers capacitor C 1, and the size of C2 is understood the height of minimal effect oscillation frequency, the stability of oscillator work, the complexity and the temperature stability of starting of oscillation, selects the electric capacity of 30PF for use.Reset circuit is made up of resistance, electric capacity and keyswitch, has the function of electrification reset and hand-reset.The INTO of single-chip microcomputer links to each other through not gate with the infrared eye output terminal.Be to prevent that the environmental disturbances signal to triggering the influence of interrupting, having no progeny in response, look-at-me is is repeatedly patrolled and examined, when affirmation is look-at-me, just go to carry out the Interrupt Process subroutine, otherwise think that the external interference signal do not carry out the processing of reporting to the police.The PO mouth is a data bus, is connected with the data line of MT8888.P3.7 connects the transistor base of dialing speech conversion circuit, is used for the switching of dtmf tone frequency signal and voice signal; P1.6 meets the playback pin PLAYL/ of ISD1420 speech chip, and low level is effective; P3.5 is used to simulate the control of dislodging machine, and the work of realization system and substation is switched; P2.0 links to each other with the RSO of MT8888, the selection of control MT8888 internal register; P3.4 links to each other with the CS of MT8888, the gating of control MT8888.RXD, TXD are reserved as the main control computer serial communication interface; The TI mouth connects the worker RQ/CP end of MT8888, is used to count the number of monitoring phone sound square-wave signal, and the INTO mouth links to each other with the infrared eye output terminal through not gate, is used to receive alerting signal, causes to interrupt; WR, RD link to each other with RD with the WR of MT8888 respectively, the read-write of control MT8888.

Fig. 4 and Fig. 5 show the pinouts of DTMF module described in the utility model and the circuit diagram of the automatic dial-up circuit that matches with said DTMF module.Adopt DTMF pulsing chip MT8888 and single-chip microcomputer and audio amplifier circuit to make up in this programme,, and dtmf signal delivered on the telephone wire with the detection that realizes various signal tones and the generation of dtmf signal.

This part circuit is mainly accomplished the phone touch-tone signal is decoded, and simultaneously, in the time of in the illegal inlet chamber of people, dials the telephone number that presets and can carry out distant early warning, so that alert is handled.Because native system is to utilize phone to report to the police automatically, thus system's necessary ability automatic off-hook, dialing and on-hook, and can record and playback automatically.For the sake of security, also be necessary to increase the function of cryptographic check, and can the alert state be stored timely, in order to inquiry.Realize the telephone wire telecommunication, key component is the DTMF transmission circuit.It will realize functions such as dialing automatically, busy tone identification, the tinkle of bells identification.The double-tone frequency codec chip of use phone-specific is imported the decoding of double-audio signal, is a kind of method relatively more commonly used.Not only peripheral circuit is simple to use integrated circuit, and good reliability.Through the decoding of special IC, conversion of signals becomes different code system signals, can be directly got by monolithic is machine-readable.Under no alert condition, this part circuit and telephone set break off, and therefore can not have influence on the normal use of telephone set.

The DTMF chip that adopts in this example is used very extensive in communication system, like DTMF selective call signaling in the dtmf dialing of public telephone network Central Exchange, relay system, the wired and wireless dispatch system etc.For satisfying the requirement of dialing automatically, dtmf signal coding/decoding chip MT8888 chip has been selected by system.The MT8888 chip is the dtmf signal coding/decoding chip that Canadian Mitel company produces, and has dtmf signal transmission-receiving function and telephone signal tone measuring ability.It adopts the CMOS manufacturing process, and (having only 57. 8mW) low in energy consumption, chip integration is high, and working stability is reliable.In addition, it can be easily and MCS-51 series monolithic interface, and peripheral circuit is simple.Its dialing principle is: dual-tone multifrequency is DTMF, is meant with the combination of two specific tone signals to represent numeral or function.The frequency of two tone signals is different, and the numeral of representative is also different with function.16 buttons are arranged in the DTMF pulsing mode, to 8 kinds of different tone signals should be arranged, because of its frequency that adopts has 8 kinds, thus be called multifrequency, shown in table 4-1.Therefrom extract 2 kinds arbitrarily out and make up, be called again and get 2 coding method in 8.Be divided into two crowds to these 8 kinds of frequencies, i.e. high frequency group and low frequency group, wherein low frequency group has 4 kinds of frequency: 679MHz, 770MHz, 852MHz, 941MHz, high frequency group also have 4 kinds of frequency: 1209MHz, 1336MHz, 1477MHz, 1633MHz.From high frequency group and low frequency group, respectively extract a kind of frequency arbitrarily out and make up, have 16 kinds of different combinations, each key number corresponds respectively to the sinusoidal wave sum of a kind of bass and high audio, represents 16 kinds of different numerals or function.Transmit sound signal with the DTMF pulsing mode, velocity of propagation is fast, and antijamming capability is strong.

MT8888 provides the interface that links to each other with the Intel microprocessor, so that its transmission, reception and mode of operation are controlled.In the telephone automatic alarm system, the interface circuit of MT8888 and microprocessor AT89S51 is as shown in Figure 5.Its receiving unit adopts single-ended input, forms with C201 by 8201,8202, and its input voltage gain is for R202/R201=1, through changing the gain of 8202 scalable input signals.Its transmitting section is by C205, and 8206, C204 and XTAL2 constitute, and wherein XTAL2 is the crystal oscillator of 3.5795MHz, is responsible for producing whole 16 kinds of standard dual-tone signals.Its control section is by 8203, and C203 constitutes.In addition, because IRQ/CP end is the output of increasing income, so will use pull-up resistor 8204, (the TO pin links to each other, and is used for monitoring the square wave number of counting line loop signal tone with single-chip microcomputer P3.5.C203 is for removing to bring disaster upon electric capacity.DTMF IN links to each other with telephone interface circuit with DTMF OUT.DO-D3 links to each other with the data line P0.0-P0.3 of single-chip microcomputer, accomplishes the transmission of data and the input of control command, the reading etc. of state.WR, RD pin link to each other with the pin of the same name of single-chip microcomputer respectively, so that the read-write of this letter chip is controlled.CS is a chip select line, links to each other with the P2.7 of single-chip microcomputer.The RSO pin is accomplished the selection to this chip internal register, links to each other with P2.0.

Voice module should be accomplished the pre-record prompting sound, is " family has the robber to invade, and please in time comes back ".Simultaneously, behind closing of the circuit, can be with speech play.According to the functional requirement of system, select the ISD1420 speech chip of American I SD company in this example.ISD 1420 is the high-quality monolithic audio record circuit that American I SD company produces, and is provided with the required whole basic function circuit of high-quality voice recording-reproducing system such as clock oscillator, 128K byte EZPROM, low noise prime amplifier, automatic gain control circuit, anti-confusion filtering device, smoothing filter, analogue repeater, differential power amplifier in its sheet.The recording-reproducing system of a minimum only is made up of a microphone, loudspeaker, two buttons, power supply, a minority resistance capacitance.Recording substance deposits the permanent storage unit in, and the zero energy information stores is provided, and this unique method is to realize by means of the patent of American I SD company-DAST.Utilize it, voice and sound signal are got into eeprom memory by directly storage with its analog form originally.The direct modeling storage allows to use a kind of monolithic solid circuit methods to accomplish its reproduction of voice originally.Not only voice quality is winning, and the protection of outage voice.

AO-A7 is address or operator scheme control end VSSD for digitally in the pin of ISD1420; VSSA is simulation ground; SP+, SP one is an audio signal output end, can drive 8-16 loudspeaker; V+.Be analog power; VCC is digital power; MIC is the microphone input end, and available Electret condenser microphone closes through the electric capacity misfortune; MICREF is a microphone input reference edge, if need not be unsettled; AGC is the automatic gain control end, and adjustment chip internal pregain makes the typing signal undistorted; ANAIN, the indirect electric capacity in ANAOUT two ends, this end are used for direct input, the output of simulating signal; XCLK is external clock or ground connection (general user's ground connection gets final product); REC is record, playback control, low level for recording (at this moment/PLAYS or/PLAYL=0); / PLAYL should keep low level (at this moment/REC=0) for level playback control (low level is effective) during playback; / PLAYS is edge playback control, and negative edge begins playback (at this moment/REC=0); / RECLED is the recording indication, and the sending and receiving optical diode is bright during recording, and playback finishes to glimmer, extinguishes then.

The circuit diagram of the sound circuit that matches with aforementioned voice module is as shown in Figure 6, makes voice power amplifier chip with audio frequency amplification circuit LM386N-1, can adjust the amplitude of playback output.LM386 is the audio-frequency power amplifier that National Semiconductor produces, and is mainly used in the low-voltage consumer product.For making peripheral cell minimum, be changed to 20 in the voltage gain.But between 1 pin and 8 pin, increase an outer meeting resistance and electric capacity, just can voltage gain be adjusted to arbitrary value, until 200.Input end is with the status reference, and output terminal is biased to the half the of supply voltage automatically simultaneously, and under the 6V supply voltage, its quiescent dissipation is merely 24mW, makes LM386 be specially adapted to battery powered occasion.

Because outside line is connected on the substation at ordinary times, system and telephone wire break off, and have only when needs are reported to the police, and system just connects outside line, and system just can not have influence on the normal use of phone like this; In addition, the sound signal of dial-up circuit, sound circuit output all need be seen off through outside line.Telephone line interface circuit is accomplished above function, and its circuit diagram is as shown in Figure 7.At present, the WV of switch is direct current 60V or 48V, inserts substation through outside line.In order to ensure the normal transmission of dtmf signal of dial-up circuit and the normal broadcast of sound circuit voice signal; Must increase polar protective circuit in the interface circuit; It is made up of diode bridge, no matter how the user inserts LINE IN mouth with outside line like this, 2 lines that can both guarantee inside circuit are positive voltage.In addition, the available working current of the switch that has is 50mA or 120mA, and therefore, the diode reverse in the polar protective circuit is withstand voltage must be greater than 180V, and the forward current of permission must be greater than 180mA.Can select IN4004 for use, IN4007 etc.

According to the standard of the Ministry of Posts and Telecommunications about call log, therefore the direct current resistance under the off hook state should, directly connect one 200 ohm high-power resistance smaller or equal to 300 behind polar protective circuit, with the on-hook of simulation off-hook.When the simulation off-hook, user outline voltage is reduced to about 8V.Simulation dislodging machine is cooperated by the adhesive of J1 relay realizes that J1 links to each other for 7 mouthfuls with single-chip microcomputer P1..During the simulation on-hook, work in cut-off state.When single-chip microcomputer sends simulation off-hook when order, P1. 7 becomes high level, and triode is by saturated by becoming, relay work, and the closing of contact, 2000 resistance insert telephone network, realize the operation of simulation off-hook.The connection of sound circuit cooperates realization by relay J 2 adhesives, and at ordinary times, DTMF IN and DTMF OUT insert line loop, to dial automatically; When the signal tone of having dialed number and having sent back to just carries out voice suggestion during for the other side's off hook tone, at this moment, single-chip microcomputer sends the sending voice order, and Pl. 4 becomes high level; Triode by by become saturated, relay work, the closing of contact; SP+, SP one inserts in the line loop, and voice are seen off.In order to reduce system power dissipation, relay has been selected highly sensitive type, and WV is+5V.For improving the anti-interference of sound signal, dial-up circuit, sound circuit can link to each other with telephone interface circuit through the 1:1 isolating transformer.

During use, pyroelectric infrared detector is installed in the users home needs the position of taking precautions against, for example door and window, kitchen, and bedroom etc., alarm host machine is placed on the more hidden zone of family.Under normal conditions, watch-dog is to be in dormant state, when the user will go out, in the family during no one; The user can start watch-dog through keyboard, after watch-dog is received user command, waits for a time, like 3min; Have time enough to leave dwelling house after letting the user start watch-dog, after this time, watch-dog can start probe, and this moment, watch-dog was in the real state of deploying troops on garrison duty; As long as someone is process in the probe sensing range, alarm detector sends alerting signal to automatic alarm host machine immediately, receive the alert incident after, automatically alarm host machine is confirmed immediately; Repeatedly patrol and examine look-at-me, confirm errorless after, from ROM (read-only memory), read corresponding alarm call number; Automatically dial the alarm call number that the user pre-sets through the DTMF pulsing chip,, carry out remote dial and report to the police: after treating the other side's off-hook like phone number or office number etc.; Start sound circuit, the voice messaging of prerecording is passed to the other side through telephone wire, notify the other side that alert takes place.

Claims (1)

1. an intelligent alarm comprises AT89S51 single-chip microcomputer, phone and a loudspeaker, it is characterized in that: said alarm also comprises some pyroelectric infrared detectors, telephone line interface circuit, DTMF transceiver module and voice module; Wherein, Be connected to the interrupt request singal input end of AT89S51 single-chip microcomputer behind the alarm signal output ends process pyroelectric infrared detector testing circuit of said pyroelectric infrared detector; The off-hook control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said telephone line interface circuit, to realize the simulation off-hook; The dialing control signal output ends of said AT89S51 single-chip microcomputer is connected to the trigger pip input end of said DTMF transceiver module, to realize automatic dialing; The signal input end of said voice module is connected to the voice driven signal output part of AT89S51 single-chip microcomputer, and the drive signal output terminal of said voice module is connected to the driving signal input of said loudspeaker.

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