CN2615977Y

CN2615977Y - Intelligent radio comprehensive alarming system based on local telephone network

Info

Publication number: CN2615977Y
Application number: CN 03234207
Authority: CN
Inventors: 徐庆宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-28
Filing date: 2003-04-28
Publication date: 2004-05-12
Anticipated expiration: 2013-04-28

Abstract

The utility model discloses an intelligent wireless integrated alarm system based on local telephone network, which comprises a telephone line which is connected with local telephone network , a telephone, a host machine, a radio-active probe, a wireless door magnetic probe, an emergency button switch, a remote controller, combustible gas, and a smog probe, a keyboard and a wireless alarm, the host machine is connected with the telephone line and the telephone, comprising a MCU processor, a high-frequency emitter circuit, and a dial tone identification circuit and the like, the model number of the MCU processor is 16F627 OR 16F628, the processor of the host machine of the utility model adopts a microcomputer chip with small volume and powerful function, the host machine is connected with the alarm with a wireless connection, thereby the host machine has good effect for hiding and strong confidentiality, in the process of the telephone line is breakdown or destroyed, the host machine is capable of immediately identifying and alarming, thereby the system has a high sensitivity.

Description

Intelligent radio integrated warning system based on the Local Network

Technical field the utility model relates to a kind of integrated warning system, especially a kind of intelligent radio integrated warning system based on the Local Network.

Technical background at present on the market burglar alarm is various in style, mostly adopts the communication modes of fixed code, and group/cording quantity is limited and immobilize, and is is easily intercepted and captured device or sweeps a yard device and crack, and confidentiality is poor.Have a kind of name to be called " home intelligent central controller ", the patent No. is the patented technology of ZL00259836, and this utility model adopts chip to make core parts, is suitable for family or hotel intelligent management, but not only remote controlled but also short-range operation, also can remote alarms.But this kind device still has following deficiency: 1. main frame and alarm are wired connections, expose the main frame position during alarm equipment alarm easily, and it is disguised that main frame is lacked, and destroyed easily.2. do not have the telephone line measuring ability, telephone line such as destroyedly also can't discern just can't outwards be reported to the police certainly.

Summary of the invention the utility model provides a kind of and sends high-frequency signal by main frame in order to overcome above-mentioned shortcoming, drives the integrated warning system that wireless alarm sends alarm signal.

The technical solution of the utility model: based on the intelligent radio integrated warning system of Local Network, it mainly comprises telephone wire, telephone set, main frame, active correlation probe, wireless door magnetic probe, danger button switch, remote controller, fuel gas and smog probe and keyboard with Local Network UNICOM; Following basic circuit is arranged in the main frame: circuit, keypad tone decoding circuit are added in high frequency receiving circuit, dialing interface circuit, sound circuit, monitoring circuit, telephone wire preferential right control circuit, battery voltage supervisory circuit, keyboard and LED indicating circuit, remote controller and probe deletion; Initiatively correlation probe, wireless door magnetic probe, danger button switch, remote controller, fuel gas and smog probe all can send Keeloq rolling code signal to main frame after being triggered; It is characterized in that: 1. described main frame is connected with telephone set with described telephone wire; 2. described main frame also comprises MCU processor, high frequency transmission circuit, dialing tone identification circuit, the corresponding port of MCU processor is connected with high frequency receiving circuit, high frequency transmission circuit, dialing interface circuit, sound circuit, dialing tone identification circuit, battery voltage supervisory circuit, keyboard and LED indicating circuit, keypad tone decoding circuit respectively, and the dialing tone identification circuit is connected with MCU processor and telephone wire preferential right control circuit; 3. it also comprises wireless alarm, and the high frequency transmission circuit of described main frame sends high-frequency signal and drives wireless alarm and send chimes of doom.

The model of described MCU processor is 16F627 or 16F628, and the model of the chip IC 8 of described dialing tone identification circuit is LM358; The dialing tone identification circuit is connected with the RB3 port of the processor of MCU, and high frequency transmission circuit is connected with the RB2 port of the processor of MCU.

Described high frequency transmission circuit is made up of triode Q6, crystal oscillator XT3, capacitor C 3, C7 and C8, resistance R 7 and resonant inductance L1; The RB2 port of MCU inserts triode Q6 base stage through resistance R 7, crystal oscillator XT3 is connected to Q6 base stage and ground end, the Q6 emitter is through the parallel circuits ground connection of resistance R 7, capacitor C 7, capacitor C 8 is connected between Q6 emitter and the long-pending electrode, the long-pending electrode of Q6 connects+the 5V power supply through humorous Chun inductance L 1, and capacitor C 3 is connected to+the positive and negative end of 5V power supply.

Described dialing tone identification circuit is made up of capacitor C 4, resistance R 12, R13, R19, R20, R21, R22, R27, R37, triode Q9 and chip IC 8A, IC8B; Capacitor C 4 is connected with resistance R 12 and is connect 2 pin of IC8A again, 2 pin of IC8A are connected to 1 pin of IC8A through resistance R 37,1 pin of IC8A is connected to 5 pin of IC8B, inserts triode Q9 base stage after 7 pin of IC8B are connected with resistance R 13, and the long-pending electricity level of Q9 is connected to the RB3 port of MCU; Resistance R 19, R21 are serially connected with the positive and negative end of 5V power supply, and its common point inserts 3 pin of IC8A, and resistance R 27, R22 are serially connected with the positive and negative end of 5V power supply, and its common point inserts 6 pin of IC8B; 8 pin of IC8B, 4 pin are connected to the positive and negative end of 5V power supply respectively; Triode Q9 grounded emitter, long-pending electrode connects the 5V power positive end through resistance R 20.

Described wireless alarm circuit is by by the high frequency receiver module, chip IC 2A, IC2B, IC1, and resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 1, triode Q1 and alarming horn are formed; The high frequency receiver module links to each other with 3 pin of chip IC 2A; 2 pin of IC2A are through resistance R 5 ground connection, link to each other with 1 pin of IC2A through resistance R 6; The 1 foot meridian capacitor C1 of IC2A connects 5 pin of IC2B, is parallel with resistance R 7 between 5,6 pin of IC2B, is parallel with resistance R 4 between 6,7 pin of IC2B; Be connected on after resistance R 1 and the R3 series connection+positive and negative electrode of 5V power supply between, its common point is connected on 6 pin of IC2B; 7 pin of IC2B link to each other with the P1 mouth of IC1 (6 pin), and the T3 mouth of IC1 (4 pin) links to each other through the base stage of resistance R 2 with triode Q1, Q1 grounded emitter, an end of the long-pending electrode loudspeaker taking alarm of Q1; Another termination+5V power supply of 8 pin of IC2A, 1 pin of IC1, alarming horn, the 8 pin ground connection of 4 pin of IC2B, IC1.

The processor adopting chip of micro-computer of the utility model main frame, volume are small and exquisite, powerful; Be wireless connections between main frame and the alarm, thus the main frame good concealment, strong security; When telephone line has fault or when destroyed, main frame can be discerned and report to the police immediately, makes system have very high sensitivity.

The utility model is described in further detail below in conjunction with accompanying drawing for description of drawings:

Fig. 1 is the system works schematic diagram.

Fig. 2 is a host circuit structured flowchart of the present utility model.

Fig. 3 is the utility model host circuit figure.

Fig. 4 is the utility model wireless alarm circuit diagram.

Fig. 5 is a host work flow chart of the present utility model.

Embodiment (referring to Fig. 1), integrated warning system of the present utility model is made up of the telephone wire that connects with the Local Network, telephone set, main frame, wireless alarm, keyboard and active correlation probe, wireless door magnetic probe, danger button switch, remote controller, fuel gas and the smog probe that can send Keeloq rolling code signal, joins with telephone set after telephone wire and main frame link again.Main frame receives and handles wireless door magnetic probe, danger button switch, remote controller, fuel gas and smog probe and the Keeloq rolling code signal that sends of correlation probe initiatively, and can launch high-frequency signal to wireless alarm, drives its warning.

(referring to Fig. 2), the utility model main frame is made up of MCU processor, high frequency receiving circuit, high frequency transmission circuit, dialing interface circuit, sound circuit, monitoring circuit, telephone wire preferential right control circuit, dialing tone identification circuit, battery voltage supervisory circuit, keyboard and LED indicating circuit, remote controller and probe deletion interpolation circuit, keypad tone decoding circuit.Wherein the MCU processor is that PIC16F627 (8) processor is embedded in rolling code decoding software and application software, and its corresponding port links with high frequency receiving circuit, keypad tone decoding circuit, keyboard and LED indicating circuit, high frequency transmission circuit, dialing interface circuit, sound circuit, remote controller and probe deletion interpolation circuit, battery voltage supervisory circuit, dialing tone identification circuit respectively; Telephone wire at first links with telephone wire preferential right control circuit, and then links with telephone set; Telephone wire preferential right control circuit links with dialing tone identification circuit, dialing interface circuit, sound circuit, monitoring circuit, keypad tone decoding circuit respectively.

High frequency receiving circuit receives the Keeloq rolling code signal that sends from wireless door magnetic probe, danger button switch, fuel gas and smog probe, danger button switch and active correlation probe, delivers in the MCU processor after amplifying shaping.High frequency transmission circuit: the emission high-frequency signal drives wireless alarm and reports to the police.Dialing interface circuit: the dial impulse of MCU processor output is converted to the dual-tone dialing sound, realizes automatic dialing.Sound circuit: record and play voice signal.Monitoring circuit: monitor on-the-spot sound.Telephone wire preferential right control circuit: guarantee that this warning system has the override right to use of telephone wire.Electric voltage observation circuit: monitor supply voltage at any time, when voltage is lower than setting, send low-voltage signal, after MCU handles, inform the user with sound, light form to the MCU processor.Keyboard and LED indicating circuit: be used for the user and import telephone number, control and understanding host work state.Remote controller and probe are deleted and added switch: be used for remote controller and probe deletion interpolation, this function is used when remote controller is lost and increase probe.Keypad tone decoding circuit: solve the code value of keypad tone, give MCU and handle, realize the operating state of the phone long-distance remote control guard against theft and alarm system main frame of user by on hand, promptly set up defences, withdraw a garrison, function such as monitoring.

The port and the MCU processor of dialing tone identification circuit join, and another port and telephone wire preferential right control circuit join; A port of high frequency transmission circuit and MCU processor joins, and is after the electromagnetic wave that it is launched is received by the high frequency receiver module of wireless alarm, treated, amplify the back, promote alarming horn and send alarm sound.

(referring to Fig. 3), this accompanying drawing is the host circuit schematic diagram, originally there is shown the annexation of circuit such as MCU processor and dialing tone identification circuit, keypad tone decoding circuit, high frequency transmission circuit, circuitry lines preferential right control circuit, dialing interface circuit, battery voltage supervisory circuit; Not shown circuit adds circuit, keyboard and LED indicating circuit etc. as high frequency receiving circuit, sound circuit, monitoring circuit, remote controller and probe deletion, and the circuit of itself is not done too much description as the known technology in present technique field at this; Only introduce they and the annexation of the port of MCU processor IC5 herein: the RA5 port of MCU processor IC5 is connected with high frequency receiving circuit, RA1, the RA3 of MCU processor IC5, RA4 port are after IC3, IC4 expansion, Q5, Q6, Q7 end by IC4 connect language circuit, monitoring circuit, the RB0-RB7 port of MCU processor IC5 connects keyboard circuit, RA1, the RA3 of MCU processor IC5, RA4 port are after IC3, IC4 expansion, by Q0, Q1, Q2, the Q3 end connection LED indicating circuit of IC4; Remote controller and probe deletion are added circuit on keyboard.

In this accompanying drawing, MCU processor IC5, model is 16F627 or 167F628, it is embedded in rolling code decoding software and application software, handles from Keeloq rolling code signal, the multiple input signal of high frequency receiving circuit and controls various output units.Phone priority control circuit in this accompanying drawing, dialing interface circuit (IC1; model is HT9200A), supply voltage monitoring circuit (IC6; HT7044), keypad tone decoding circuit (IC9; model is HS8200) and port expansion circuit not as protection range of the present utility model, be not further described in detail.Introduce the dialing tone identification circuit and the high frequency transmission circuit of the utility model protection main points below.

Dialing tone identification circuit (IC8, model is LM358), an end is connected with the MCU processor (linking to each other with the RB3 port among this figure), and the other end links to each other with phone priority control circuit.The dialing tone identification circuit is made up of capacitor C 4, resistance R 12, R13, R19, R20, R21, R22, R27, R37, triode Q9 and chip IC 8A, IC8B, capacitor C 4 is connected with resistance R 12 and is connect 2 pin of IC8A again, 2 pin of IC8A are connected to 1 pin of IC8A through resistance R 37,1 pin of IC8A is connected to 5 pin of IC8B, insert triode Q9 base stage after 7 pin of IC8B are connected with resistance R 13, the extremely electric level of Q9 is connected to the RB3 port of MCU (IC5).Resistance R 19, R21 are serially connected with the positive and negative end of 5V power supply, and its common point inserts 3 pin of IC8A, and resistance R 27, R22 are serially connected with 5V power supply positive and negative terminal, and its common point inserts 6 pin of IC8B.8 pin of IC8B, 4 pin are connected to the positive and negative end of 5V power supply respectively.Triode Q9 grounded emitter, long-pending electrode connects the 5V power positive end through resistance R 20.

The course of work of dialing tone identification circuit: the 450HZ sinusoidal signal is sent into 2 pin of C8A through C4, R12, sending into the 5 pin shapings of IC8B after the first order is amplified handles, send into the RB3 port of MCU processor (IC5) again by the anti-phase anti-generation 450HZ square wave of triode Q9, judge by internal software identification.

High frequency transmission circuit links to each other with the RB2 port of MCU processor (IC5), is made up of triode Q6, crystal oscillator XT3, capacitor C 3, C7 and C8, resistance R 7 and resonant inductance L1; The RB2 port of MCU inserts triode Q6 base stage through resistance R 7, crystal oscillator XT3 is connected to Q6 base stage and ground end, the Q6 emitter is through the parallel circuits ground connection of resistance R 7, capacitor C 7, capacitor C 8 is connected between Q6 emitter and the long-pending electrode, the long-pending electrode of Q6 connects+the 5V power supply through humorous Chun inductance L 1, and capacitor C 3 is connected to+the positive and negative end of 5V power supply.

The high frequency transmission circuit of being made up of said elements is a Voltage-Controlled oscillation circuit, and this circuit goes out the high frequency constant amplitude to space radiation and is interrupted electromagnetic wave.After the receiver module of wireless alarm receives this signal, through amplification, shaping, send into decoding circuit, decoding back produces control signal, the driving alarming horn sends alarm sound.

(referring to Fig. 4), this accompanying drawing are the wireless alarm circuit theory diagrams.It is by the high frequency receiver module, chip IC 2A, IC2B, IC1, and resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 1 and triode Q1 form.When telephone line has fault, the destroyed or reserved call ring unanswered that dialed, the high frequency transmission circuit of main frame sends radio wave, high frequency receiver module receive signal after, 3 pin through chip IC 2A are sent into amplifier, after putting shaping, chip IC 2A, IC2B (model is LM358) deliver to the P1 port of chip IC 1 (model is LM358), IC1 handles after the P3 port sends out the alert audio signal, promotes alarming horn and send alarm sound after triode Q1 amplifies.

The wireless alarm circuit connecting relation is: the high frequency receiver module links to each other with 3 pin of chip IC 2A; 2 pin of IC2A are parallel with resistance R 7 through resistance R 5 ground connection, connect 5 pin of IC2B through link to each other with 1 pin of the IC2A 1 foot meridian capacitor C1 of IC2A of resistance R 6 between 5,6 pin of IC2B, be parallel with resistance R 4 between 6,7 pin of IC2B; Be connected on after resistance R 1 and the R3 series connection+positive and negative electrode of 5V power supply between, its common point is connected on 6 pin of IC2B; 7 pin of IC2B link to each other with the P1 mouth of IC1 (6 pin), and the P3 mouth of IC1 (4 pin) links to each other through the base stage of resistance R 2 with triode Q1, Q1 grounded emitter, an end of the long-pending electrode loudspeaker taking alarm of Q1; Another termination+5V power supply of 8 pin of IC2A, 1 pin of IC1, alarming horn, the 8 pin ground connection of 4 pin of IC2B, IC1.

(referring to Fig. 5), this accompanying drawing are the host work flow charts.System with initialization after, at first detect main frame and whether be in the operating state of setting up defences, as then returning for not (that is: be not in the operating state of setting up defences), as for being whether (that is: being in the operating state of setting up defences) is then further detected each probe and be triggered, as each probe be not triggered (being no signal), then return, trigger (signal is promptly arranged), then main frame simulation off-hook as a certain probe; Whether be 450HZ signal, be the 450HZ signal if detect if detecting in the main frame, then transfer to the telephone number that prestores, and then return again, and is not the 450HZ signal if detect, and then sends signal to high frequency transmission circuit, drives wireless alarm and report to the police.

The course of work of this intelligent radio integrated warning system main frame: the user is in a simple manner by 1-3 reserved call number of host keyboard input, typing alarm voice information (such as: be XX building, XX building, XX sub-district, XX road XX number here, someone breaks in, please report to the police), open burglary-resisting system then.As the people in door, window inlet chamber, when touching wireless door magnetic probe, active correlation probe, main frame can be transferred to alarm call according to the telephone number of reserving in quiet mode, automatically play alarm voice information behind the telephone receiving, enter listening state, the various sounds in the monitor room allow the user understand the situation of family, can take to start recording and start measure such as external warning signal.Also stay important on-the-spot evidence simultaneously, assisted public security organ to solve a case.

If someone destroys behind the telephone line in the inlet chamber or during reserved call number ring unanswered, main frame then can drive wireless alarm with 120db sound onsite alarming, works threatening and the fright effect.In addition, when the indoor generation condition of a fire and imflammable gas leakage, main frame can be reported to the police in the mode of calling or drive wireless alarm.The user inputs password after can also putting through telephone number in the family by telephone set on hand, the operating state of long-distance remote control guard against theft and alarm system main frame functions such as (set up defences, withdraw a garrison) monitorings.

Destroyed or when having a power failure, this system is work as usual when city's power supply circuit.

The operation principle of this intelligent radio integrated warning system main frame: the telephone number of user's input is sent into MCU processor (IC5) by the RB0-RB7 port on the keyboard, after internal processes is handled, these telephone numbers are stored among the EEPROM of MCU, in order to calling later on.Also be provided with the anti-/ key of withdrawing a garrison on the keyboard, be used for opening and closing warning system main frame.After main frame is opened (setting up defences), main frame enters the operating state of setting up defences, (initiatively correlation is popped one's head in when external probes, the wireless door magnetic probe, fuel gas and smog probe) is triggered or emergency switch when pressing, they send Keeloq rolling code signal to main frame, the high frequency receiving circuit received signal of main frame is through amplifying, send into the RA5 port of MCU processor after the shaping, this moment, the Keeloq program of MCU processor inside communicated information in the user program after to these signal decodings, user program drives port extended chip (IC3, IC4) the Q4 mouth of putting IC4 makes the Q6 conducting, relay (JDQ1) inhale and, cut off the JP2 place after the machine of answering the call, make main frame have the preferential right of telephone wire.Again the RA0 port is put 1, triode Q3, Q1 conducting simulation off-hook, after the 450HZ dialing tone signal amplification that dialing tone detection chip this moment (IC8) is sent telephone wire here, the shaping, deliver to the RB3 mouth of MCU processor, user program will judge whether this signal is 450HZ, if not, illustrate that telephone line has fault or destroyed, the MCU processor will drive high-frequency circuit by the RB2 mouth and send radio wave so, and the open wireless alarm is reported to the police with the 120DB volume; If the 450HZ signal is arranged, then the Q7 conducting starts dialing interface chip (IC1), interface chip is converted to double-audio signal to the dial impulse from MCU processor RA6, RA7, sending to telephone wire through Q5 gets on, after the quilt machine of dialing is answered, the MCU processor starts recording chip (IC8) playback by Q5, the Q6 end of port extended chip (IC3, IC4), deliver on the telephone wire through Q11, after this monitoring circuit is started working, the on-the-spot sound that microphone (S1) picks up is also delivered on the telephone wire after amplifying, and realizes passing through telephone alarm function.When supply voltage was lower than 7V, supply voltage chip monitoring (IC6) output 0 signal was to the RB0 port of MCU processor, and processor is exported 1 signal Q8 conducting by RA2, and buzzer (BUZZ1) sends prompt tone and informs that cell voltage is low excessively.The various operating states of main frame show through the Q0-Q3 port driver LED of port extended chip (IC3, IC4).When the user passed through the telephone set long-range control host machine, keypad tone decoding chip (IC9) solved this value, sends into MCU processor RB1 port again after parallel/serial conversion, the operating state of main control system.

Claims

1. based on the intelligent radio integrated warning system of Local Network, it mainly comprises telephone wire, telephone set, main frame, active correlation probe, wireless door magnetic probe, danger button switch, remote controller, fuel gas and smog probe and the keyboard that connects with the Local Network; Following basic circuit is arranged in the main frame: high frequency receiving circuit, dialing interface circuit, sound circuit, monitoring circuit, telephone wire priority are used and are wanted control circuit, battery voltage supervisory circuit, keyboard and LED indicating circuit, remote controller and probe deletion to add circuit, keypad tone decoding circuit; Initiatively correlation probe, wireless door magnetic probe, danger button switch, remote controller, fuel gas and smog probe all can send Keeloq rolling code signal to main frame after being triggered; It is characterized in that: 1. described main frame is connected with telephone set with described telephone wire; 2. described main frame also comprises MCU processor, high frequency transmission circuit, dialing tone identification circuit, the corresponding port of MCU processor is connected with high frequency receiving circuit, high frequency transmission circuit, dialing interface circuit, sound circuit, dialing tone identification circuit, battery voltage supervisory circuit, keyboard and LED indicating circuit, keypad tone decoding circuit respectively, and the dialing tone identification circuit is connected with MCU processor and telephone wire priority control circuit; 3. it also comprises wireless alarm, and the high frequency transmission circuit of described main frame sends high-frequency signal and drives wireless alarm and send chimes of doom.

2. the intelligent radio integrated warning system based on the Local Network according to claim 1 is characterized in that: the model of described MCU processor is 16F627 or 16F628, and the model of the chip IC 8 of described dialing tone identification circuit is LM358; The dialing tone identification circuit is connected with the RB3 port of the processor of MCU, and high frequency transmission circuit is connected with the RB2 port of the processor of MCU.

3. the intelligent radio integrated warning system based on the Local Network according to claim 1 and 2 is characterized in that: described high frequency transmission circuit is made up of triode Q6, crystal oscillator XT3, capacitor C 3, C7 and C8, resistance R 7 and resonant inductance L1; The RB2 port of MCU inserts triode Q6 base stage through resistance R 7, crystal oscillator XT3 is connected to Q6 base stage and ground end, the Q6 emitter is through the parallel circuits ground connection of resistance R 7, capacitor C 7, capacitor C 8 is connected between Q6 emitter and the long-pending electrode, the long-pending electrode of Q6 connects+the 5V power supply through humorous Chun inductance L 1, and capacitor C 3 is connected to+the positive and negative end of 5V power supply.

4. the intelligent radio integrated warning system based on the Local Network according to claim 1 and 2 is characterized in that: described dialing tone identification circuit is made up of capacitor C 4, resistance R 12, R13, R19, R20, R21, R22, R27, R37, triode Q9 and chip IC 8A, IC8B; Capacitor C 4 is connected with resistance R 12 and is connect 2 pin of IC8A again, 2 pin of IC8A are connected to 1 pin of IC8A through resistance R 37,1 pin of IC8A is connected to 5 pin of IC8B, inserts triode Q9 base stage after 7 pin of IC8B are connected with resistance R 13, and the extremely electric level of Q9 is connected to the RB3 port of MCU; Resistance R 19, R21 are serially connected with the positive and negative end of 5V power supply, and its common point inserts 3 pin of IC8A, and resistance R 27, R22 are serially connected with the positive and negative end of 5V power supply, and 8 pin, 4 pin that its common point inserts the 6 pin IC8B of IC8B are connected to the positive and negative end of 5V power supply respectively; Triode Q9 grounded emitter, long-pending electrode connects the 5V power positive end through resistance R 20.

5. the intelligent radio integrated warning system based on the Local Network according to claim 1 and 2, it is characterized in that: described wireless alarm circuit is by by the high frequency receiver module, chip IC 2A, IC2B, IC1, resistance R 1, R2, R3, R4, R5, R6, R7, capacitor C 1, triode Q1 and alarming horn are formed; The high frequency receiver module links to each other with 3 pin of chip IC 2A; 2 pin of IC2A are through resistance R 5 ground connection, link to each other with 1 pin of IC2A through resistance R 6; The 1 foot meridian capacitor C1 of IC2A connects 5 pin of IC2B, is parallel with resistance R 7 between 5,6 pin of IC2B, is parallel with resistance R 4 between 6,7 pin of IC2B; Be connected on after resistance R 1 and the R3 series connection+positive and negative electrode of 5V power supply between, 7 pin that its common point is connected to IC2B on 6 pin of IC2B link to each other with the P1 mouth (6 pin) of IC1, the P3 mouth of IC1 (4 pin) links to each other through the base stage of resistance R 2 with triode Q1, the Q1 grounded emitter, another termination+5V power supply of 8 pin of one end IC2A of the long-pending electrode loudspeaker taking alarm of Q1,1 pin of IC1, alarming horn, the 8 pin ground connection of 4 pin of IC2B, IC1.