CN202976375U - Anti-theft alarm based on magnetic field sensor - Google Patents
Anti-theft alarm based on magnetic field sensor Download PDFInfo
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- CN202976375U CN202976375U CN 201220735354 CN201220735354U CN202976375U CN 202976375 U CN202976375 U CN 202976375U CN 201220735354 CN201220735354 CN 201220735354 CN 201220735354 U CN201220735354 U CN 201220735354U CN 202976375 U CN202976375 U CN 202976375U
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Abstract
The utility model relates to an anti-theft alarm, in particular to an anti-theft alarm based on a magnetic field sensor. With the anti-theft alarm based on the magnetic field sensor adopted, the problems such as low reliability, frequent false alarm, large volume, high price and high maintenance cost existing in an anti-theft alarm in the prior art can be solved. The anti-theft alarm based on the magnetic field sensor includes a magnetic field generating device and a detection and alarm device; the detection and alarm device comprises a detection unit, a main control unit, an alarm unit and a power-supplying unit; the detection unit comprises a model MAG3110 magnetic field sensor (U2) and peripheral circuits thereof; the main control unit comprises a model STC12LE5A60S2 single chip microcomputer (U1) and peripheral circuits thereof which include a clock circuit and an manual-operation reset circuit; and the alarm unit comprises a buzzer or speaker (U5), a PNP-type triode Q1 and a seventh resistor R7. The anti-theft alarm based on the magnetic field sensor of the utility model has the advantages of simple structure, reasonable design, high detection reliability, low cost, small volume and the like.
Description
Technical field
The utility model relates to burglar alarm, is specially a kind of burglar alarm based on magnetic field sensor.
Background technology
The shortcoming of the existing museum of China, the common alarm existence of using in museum is as follows at present:
1, multi-dimensional standing-wave alarm: shortcoming is that Air Flow can exert an influence to detector, therefore need circulation of air little environment in use, to improve discrimination.And the ultrasound wave of multi-dimensional standing-wave detector emission is take air as transmission medium, and the temperature of air and relative humidity can affect its detection sensitivity.
2, passive infrared alarm: shortcoming is to be subject to various thermals source, sunlight source and radio-frequency radiation disturb.The passive infrared penetration power is poor, and the infrared radiation of human body easily is blocked, and is difficult for being detected device and receives, and surpasses in environment temperature and can cause detection range to shorten more than 28 ℃.When environment temperature and human body temperature near the time, survey and sensitivity obviously descends, this point is especially obvious in winter, when personnel stay for a long time outdoor, just might not report to the police when passing through detector, generation is failed to report.
3, the two mirror alarms of infrared microwave: as long as just shortcoming is to crack one can make its inefficacy.When microwave was too slowly or too fast to movement of objects speed, detector was not reported to the police.Do not report to the police during infrared ray conductively-closed that intrusion object is sent out yet.
4, active infrared intrusion alarm unit: usually use out of doors, the temperature variation of environment is very large on its impact, and aging, function decay appears in the product of particularly growing service time, material, Circuits System, electronic devices and components, reports by mistake particularly serious.
5, glass breaking alarm: this detector is that the high frequency aural signal of sending when the collection analysis glass breaking and the infrasonic wave signal that causes are reported to the police, if but when carefully glass being scratched, this alarm also may lose efficacy.The high frequency sound such as electric bell sound, metal strike note all can cause the false alarm of single technical glass breakage detector.
6, microwave Doppler detector: the microwave detector penetration power is strong, if but Rig up error, the door and window that microwave signal will penetrate the materials such as timber, glass, plastics causes reporting by mistake frequently.
7, reveal the cable type alarm detector: its detection sensitivity is subjected to the impact of the adverse weather conditions such as environment temperature, humidity, wind and rain flue dust, and the installation of equipment, debugging are comparatively complicated.
8, Switch detector: long-term work inevitably can be subject to the effect of dust in atmosphere, microorganism at outdoor detector, and the duricrust that tends to long-pending one deck dust sample on the outer wall of detector hinders to be surveyed; The weather such as mist, snow also can make On The Deterioration of Visibility Over, and detection range shortens, and produces to leak wrong report.
All there are the problems such as reliability is not high, wrong report is frequent, bulky, expensive, maintenance fund height in above-mentioned alarm.
Therefore, be necessary to invent a kind of novel burglar alarm.
Summary of the invention
The utility model is not high for the reliability that solves existing burglar alarm existence, the problems such as wrong report is frequent, bulky, expensive, maintenance fund height, and a kind of burglar alarm based on magnetic field sensor is provided.
The utility model is to adopt following technical scheme to realize:
A kind of burglar alarm based on magnetic field sensor comprises magnetic field generation device and detection alarm device, and described detection alarm device comprises detecting unit, main control unit, alarm unit and power supply unit; Described detecting unit comprises that model is magnetic field sensor U2 and the peripheral circuit thereof of MAG3110; Described main control unit comprises that model is the single-chip microcomputer U1 of STC12LE5A60S2 and the peripheral circuit that comprises clock circuit, manual reset circuit thereof; Described alarm unit comprises hummer or loudspeaker, positive-negative-positive triode Q1 and the 7th resistance R 7; Described power supply unit provides 3.3V voltage for detecting unit, main control unit, alarm unit; The 6th, 7 pins of described magnetic field sensor U2 are connected with P2.5, the P2.6 pin of single-chip microcomputer U1 by second, one resistance R 2, R1 respectively, the P2.7 pin of described single-chip microcomputer U1 is connected with positive-negative-positive triode Q1 base stage by the 7th resistance R 7, the collector of positive-negative-positive triode Q1 is connected with the input end of hummer or loudspeaker U5, and the emitter of positive-negative-positive triode Q1 is connected with the output terminal of power supply unit.
During work, be example take this application of installation in museum, in the museum, magnetic field generation device (for example magnet) is fixed on the base of showpiece, the detection alarm device is fixed on showpiece.The inner integrated A/D converter of magnetic field sensor MAG3110, thin encapsulation 2.0 mm * 2.0 mm * 0.85mm, measurement range is-10gausses～+ 10gausses, sensitivity is 0.001gausses, and precision is high, and reliability is strong, the integrated required outer member of electronic circuit is few, integrated volume is little, and major function is the magnetic field intensity around comprehensive cycle detection, sends data to main control unit.Main control unit mainly is comprised of single-chip microcomputer STC12LE5A60S2 and peripheral circuit thereof, and peripheral circuit mainly comprises clock circuit, manual reset circuit.Single-chip microcomputer STC12LE5A60S2 processes the magnetic field strength date that sends, and then compares judgement with setting value, and then whether the control alarm unit gives the alarm.Specific as follows: as shown in Figure 4, because the increase of magnetic field along with distance decays, so easily determine by experiment corresponding relation between magnetic field intensity H that the detection alarm device detects in the distance L between magnetic field generation device and the detection alarm device.For example, set as the safe distance L of detection alarm device apart from magnetic field generation device
maxDuring=2m, the magnetic field intensity that the detection alarm device detects is setting value H
minRequire base and showpiece must remain in certain distance, the distance L between both surpasses safe distance L
maxThe time, the field strength values H that detects of single-chip microcomputer STC12LE5A60S2＜H
min, the P2.7 pin of single-chip microcomputer output high level, and then driving hummer or loudspeaker are reported to the police; Otherwise the detection alarm device continues cycle detection and compares.Can according to actual conditions, select arbitrarily safe distance L
maxSize, correspondence arranges H
minSize get final product.
Compare with existing burglar alarm, the utility model has the advantage of: easy to operate simple, volume is little, and reliability is high, and is highly sensitive, and cost is low etc.; And the purposes scope is wide, both can be applicable to display in the museum, museum of valuables, also can be applicable to the high-end electronic product in daily life, as: mobile phone, MP3 MP4 MP5, palm PC, camera etc., development potentiality is huge, and market outlook are wide.
The utility model is simple in structure, reasonable in design, the problems such as the reliability that has solved existing burglar alarm existence is not high, wrong report is frequent, bulky, expensive, maintenance fund height.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the circuit theory diagrams of detection alarm device.
Fig. 3 is that ISP(is at system programmable) the element circuit schematic diagram.
Fig. 4 is workflow diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the utility model is elaborated.
As shown in Figure 1, a kind of burglar alarm based on magnetic field sensor comprises magnetic field generation device and detection alarm device, and described detection alarm device comprises detecting unit, main control unit, alarm unit and power supply unit.
Described detecting unit comprises that model is magnetic field sensor U2 and (routine) peripheral circuit thereof of MAG3110.As shown in Figure 2, the 1st pin of described magnetic field sensor U2 is by the first capacitor C 1 ground connection, the 2nd pin is by the 3rd capacitor C 3 and the 4th capacitor C 4 ground connection in parallel, the 4th pin is by the second capacitor C 2 ground connection, the 5th pin ground connection, the 10th pin ground connection, the 2nd, 8 pins are connected with the power supply unit output terminal, and the 6th, 7 pins are connected with the power supply unit output terminal by pull-up resistor (the 4th resistance R 4 and the 3rd resistance R 3) respectively.
Described main control unit comprises that model is the single-chip microcomputer U1 of STC12LE5A60S2 and (routine) peripheral circuit that comprises clock circuit, manual reset circuit thereof.As shown in Figure 2, the 38th of described single-chip microcomputer U1 the, 29 pins all are connected with the power supply unit output terminal with the 9th electrochemical capacitor C9 ground connection and the 38th pin by the 8th capacitor C 8 in parallel; The 16th pin ground connection of single-chip microcomputer U1.Described clock circuit is comprised of crystal oscillator Y1 and the 5th capacitor C 5, the 6th capacitor C 6 of a 11.0592MHz, an end that is crystal oscillator Y1 passes through the 6th capacitor C 6 ground connection and is connected with the 14th pin of single-chip microcomputer U1, and the other end of crystal oscillator Y1 passes through the 5th capacitor C 5 ground connection and is connected with the 15th pin of single-chip microcomputer U1.Described manual reset electro route button S1, the 7th electrochemical capacitor C7, the 5th resistance R 5, the 6th resistance R 6 form, be button S1 an end by the 5th resistance R 5 be connected with the 4th pin of single-chip microcomputer U1, its other end is connected with the output terminal of power supply unit, the 6th resistance R 6 one ends are connected with the 4th pin of single-chip microcomputer U1, its other end ground connection, and the positive pole of the 7th electrochemical capacitor C7 is connected with the output terminal of power supply unit, negative pole is connected with the 4th pin of single-chip microcomputer U1.
Described alarm unit comprises hummer or loudspeaker U5, positive-negative-positive triode Q1 and the 7th resistance R 7.
Described power supply unit provides 3.3V voltage for detecting unit, main control unit, alarm unit.
The 6th, 7 pins of described magnetic field sensor U2 are connected with P2.5, the P2.6 pin of single-chip microcomputer U1 by second, one resistance R 2, R1 respectively, the P2.7 pin of described single-chip microcomputer U1 is connected with positive-negative-positive triode Q1 base stage by the 7th resistance R 7, the collector of positive-negative-positive triode Q1 is connected (output head grounding of hummer or loudspeaker U5) with the input end of hummer or loudspeaker U5, and the emitter of positive-negative-positive triode Q1 is connected with the output terminal of power supply unit.
Described power supply unit adopts the button cell power supply of 3.3V or utilizes the USB mouth output 5V voltage of computing machine, powers after being converted to 3.3V by three terminal regulator U4.As shown in Figure 2, the 1st end of USB mouth J1 is by the 11 capacitor C 11 parallel with one another, the tenth electrochemical capacitor C10 and the series arm ground connection that is made of the 9th resistance R 9 and the first light emitting diode D1, the 6th end ground connection of USB mouth; The 3rd end of three terminal regulator (AMS1117-3.3V) is by the 12 electrochemical capacitor C12 and the 13 capacitor C 13 ground connection in parallel, the 1st end ground connection of three terminal regulator, the 2nd end of three terminal regulator is by the 14 electrochemical capacitor C14 in parallel and the 15 capacitor C 15 ground connection and output 3.3V voltage; One end of switch S 2 connects the 1st end of USB mouth, the 3rd end that the other end connects three terminal regulator; Above-mentioned this kind power supply mode mainly for detection of warning device in experimental phase or the convenient debugging of when maintenance.In addition, as shown in Figure 2, a socket JP1 is built-in with button cell, and its 1st end ground connection, the 2nd end are exported 3.3V voltage and passed through the 8th resistance R 8 and the second light emitting diode D2 ground connection.Described first and second light emitting diode D1, D2 are the power supply pilot lamp.
during concrete enforcement, be used in addition ISP(that single-chip microcomputer U1 downloads at system programmable) element circuit, as shown in Figure 3, described ISP element circuit comprises that model is the voltage transitions chip of MAX3232 and the serial ports J3 of 9 pins, the 2nd pin of described voltage transitions chip is by the 19 electrochemical capacitor C19 ground connection, the 1st pin is connected with the 3rd pin by the 16 electrochemical capacitor C16, the 4th pin is connected with the 5th pin by the 17 electrochemical capacitor C17, the 6th pin is by the 18 electrochemical capacitor C18 ground connection, the 16th pin is connected with the output terminal of power supply unit and by the 20 electrochemical capacitor C20 ground connection, the 15th pin is connected with the negative pole of the 20 electrochemical capacitor C20.In addition, the 14th, 13 pins of voltage transitions chip are connected with the 2nd, 3 pin of serial ports respectively, and the 11st, 12 pin of voltage transitions chip are connected with P3.0, the P3.1 pin of single-chip microcomputer U1 respectively, thus with program by downloaded in single-chip microcomputer U1.
Described magnetic field generation device can be general magnet, the magnetic field intensity scope of generation is-and 10gausses～+ 10gausses.
Claims (6)
1. burglar alarm based on magnetic field sensor, it is characterized in that: comprise magnetic field generation device and detection alarm device, described detection alarm device comprises detecting unit, main control unit, alarm unit and power supply unit;
Described detecting unit comprises that model is magnetic field sensor (U2) and the peripheral circuit thereof of MAG3110;
Described main control unit comprises that model is the single-chip microcomputer (U1) of STC12LE5A60S2 and the peripheral circuit that comprises clock circuit, manual reset circuit thereof;
Described alarm unit comprises hummer or loudspeaker (U5), positive-negative-positive triode (Q1) and the 7th resistance (R7);
Described power supply unit provides 3.3V voltage for detecting unit, main control unit, alarm unit;
The 6th, 7 pins of described magnetic field sensor (U2) are connected with P2.5, the P2.6 pin of single-chip microcomputer (U1) by second, one resistance (R2, R1) respectively, the P2.7 pin of described single-chip microcomputer (U1) is connected with positive-negative-positive triode (Q1) base stage by the 7th resistance (R7), the collector of positive-negative-positive triode (Q1) is connected with the input end of hummer or loudspeaker (U5), and the emitter of positive-negative-positive triode (Q1) is connected with the output terminal of power supply unit.
2. the burglar alarm based on magnetic field sensor according to claim 1 is characterized in that: the magnetic field intensity scope that described magnetic field generation device produces for-10gausses～+ 10gausses.
3. the burglar alarm based on magnetic field sensor according to claim 1 and 2, it is characterized in that: described power supply unit adopts the button cell power supply of 3.3V or utilizes the USB mouth output 5V voltage of computing machine, powers after being converted to 3.3V by three terminal regulator (U4).
4. the burglar alarm based on magnetic field sensor according to claim 1 and 2, it is characterized in that: described clock circuit is comprised of a crystal oscillator (Y1), the 5th electric capacity (C5) and the 6th electric capacity (C6); Described manual reset electro route button (S1), the 7th electrochemical capacitor (C7), the 5th resistance (R5) and the 6th resistance (R6) form.
5. the burglar alarm based on magnetic field sensor according to claim 3, it is characterized in that: described clock circuit is comprised of a crystal oscillator (Y1), the 5th electric capacity (C5) and the 6th electric capacity (C6); Described manual reset electro route button (S1), the 7th electrochemical capacitor (C7), the 5th resistance (R5) and the 6th resistance (R6) form.
6. the burglar alarm based on magnetic field sensor according to claim 5, it is characterized in that: described magnetic field generation device is magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220735354 CN202976375U (en) | 2012-12-28 | 2012-12-28 | Anti-theft alarm based on magnetic field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220735354 CN202976375U (en) | 2012-12-28 | 2012-12-28 | Anti-theft alarm based on magnetic field sensor |
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| Publication Number | Publication Date |
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| CN202976375U true CN202976375U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220735354 Expired - Fee Related CN202976375U (en) | 2012-12-28 | 2012-12-28 | Anti-theft alarm based on magnetic field sensor |
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| CN (1) | CN202976375U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537785A (en) * | 2014-12-15 | 2015-04-22 | 深圳怡化电脑股份有限公司 | Object movement alarm device |
| CN104574659A (en) * | 2014-12-15 | 2015-04-29 | 深圳怡化电脑股份有限公司 | Anti-theft alarm device applied to ATM (automatic teller machine) |
-
2012
- 2012-12-28 CN CN 201220735354 patent/CN202976375U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104537785A (en) * | 2014-12-15 | 2015-04-22 | 深圳怡化电脑股份有限公司 | Object movement alarm device |
| CN104574659A (en) * | 2014-12-15 | 2015-04-29 | 深圳怡化电脑股份有限公司 | Anti-theft alarm device applied to ATM (automatic teller machine) |
| CN104537785B (en) * | 2014-12-15 | 2017-06-30 | 深圳怡化电脑股份有限公司 | Object moves alarm device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20141228 |
|
| EXPY | Termination of patent right or utility model |