CN101639964B - RF-based portable goods theft-proof and alarm system and control method thereof - Google Patents

Abstract

An anti-theft alarm system for portable items based on radio frequency and its control method are mainly aimed at the anti-theft alarm problem of portable items, especially vehicle-mounted items. The invention includes a reader, more than two electronic tags, and a wireless siren. The main part of the reader and the electronic tag is the main controller and the radio frequency chip. The hardware of the system also includes a monitoring range optional module, a low battery detection module, and a new tag identification module, and can realize anti-collision and low power consumption. work. The invention has low power consumption, long service life of the battery, and easy monitoring of portable and valuable items, such as office computers, luggage, mobile phones and the like.

Description

A portable anti-theft alarm system based on radio frequency and its control method

technical field

The invention belongs to the field of an ultra-high frequency wireless anti-theft alarm system, in particular to an anti-theft alarm system for portable articles based on radio frequency and a control method thereof.

Background technique

Radio frequency identification (RFID) technology is gradually becoming a mainstream application technology, which enables rapid item identification. Radio frequency identification technology has the characteristics of high stability, strong mobility, low price, and not easily affected by the environment (such as temperature). At present, in the anti-theft alarm system of portable items, some mechanical locks or infrared technology are mainly used for anti-theft alarm, and radio frequency identification technology has not been applied to the anti-theft of portable items. In view of the above-mentioned technical advantages of radio frequency identification and the characteristics of portable items, radio frequency identification technology will have a good development prospect in the field of anti-theft alarm.

The invention patent with the Chinese patent number ZL200620119023.5 discloses an RFID article monitoring system. In the disclosed patent technology, it includes an article monitoring terminal, a radio frequency tag, an article management center host and an alarm unit, wherein each radio frequency tag Corresponding to an item monitoring terminal, then the item monitoring terminal is connected to the host of the item management center through the network, and then the host of the item management center is connected to the alarm unit. This prior art is relatively complicated, and each radio frequency tag corresponds to an item monitoring terminal, which requires more item monitoring terminals. In addition, an item management center host is added, which increases the cost and consumption of the system. In addition, this patented technology does not realize the functions of adjustable monitoring range, low battery detection and new label identification.

Contents of the invention

The invention provides a portable article anti-theft alarm system and method based on radio frequency. It realizes the function of monitoring several electronic tags through one reader, saves the number of readers, eliminates the setting requirements of the management center host, reduces costs, is simple and reliable, and is suitable for small-scale anti-theft alarm applications.

Another object of the present invention is to provide a control method of the portable article anti-theft alarm system based on radio frequency, realize the functions of anti-collision algorithm, adjustable monitoring range, and reduce power consumption.

In order to solve the above-mentioned technical problems, the present invention includes the following technical solutions: a radio frequency-based anti-theft alarm system for portable articles, including a reader, more than two electronic tags and an alarm unit; the reader and the electronic tags communicate through radio frequency Connection, the reader is connected with the alarm unit through wireless communication;

The reader includes a reading main controller, a reader wireless sending and receiving module, a first antenna, a wireless sending module and a second antenna; the reading main controller is connected to the first antenna through the reader wireless sending and receiving module; the reading main controller Connect with the second antenna through the wireless sending module;

The alarm unit includes an alarm, a wireless receiving module and a fourth antenna, and the alarm is connected to the fourth antenna through the wireless receiving module;

The electronic tag includes a tag main controller, an electronic tag wireless sending and receiving module, and a third antenna, and the tag main controller is connected to the third antenna through the electronic tag wireless sending and receiving module.

The reading controller includes a monitoring range selection module connected with the main reading controller. The monitoring range selection module is a reader transmission power size adjuster. The reading controller also includes an LED display module for displaying the operating status of the system.

The electronic tag includes a low-battery detection module connected to the tag main controller; the low-battery detection module includes a low-battery detection chip, the input end of the low-battery detection chip is connected to the voltage end of the electronic tag, and the output end is connected to the tag main controller.

The electronic tag includes a new tag identification module connected to the input terminal of the tag main controller, and the new tag identification module is a dial switch.

Another object of the present invention is to provide a kind of control method of the portable article burglar alarm system based on radio frequency, it is characterized in that at least comprising the following steps:

A. Set the address code for each electronic tag and adjust the monitoring range of the reader;

B. The reader adopts the method of speaking first, and sends signals to each electronic tag one by one to detect whether the electronic tag is within the monitoring range of the reader;

C. When the electronic tag is moved out of the monitoring range of the reader, the reader receives the alarm signal sent by the electronic tag through the wireless sending module of the reader, and the reader notifies the wireless sending module to send the signal to the wireless receiving module, and the wireless receiving module receives After the signal, the alarm is controlled to alarm.

In the step B, the process of sending signals to all electronic tags one by one by the reader is cycled 2 to 6 times as a detection cycle. If within a detection cycle, the reader can receive the signal returned by the electronic tag once or more , then it is judged that the electronic tag is within the monitoring range of the reader, and the reader enters the next detection cycle, otherwise, the reader judges that the electronic tag has been moved out of the monitoring range of the reader.

It is characterized in that in the step B, during the interval between the reader transmitting the signal, the radio frequency chip of the device is in the shutdown state, and the single-chip microcomputer is in the low power consumption mode.

The monitoring range of the reader in step A is carried out through the following steps. First, set the transmission power of several gears for the reader. Once the reader sets a fixed gear, the reader sends a signal to the electronic tag , The electronic tag automatically adjusts its own transmission power according to the content of the received signal, and realizes the adjustable monitoring range.

The positive effects of the present invention are: (1) It adopts a communication mode in which one reader corresponds to multiple electronic tags, thereby reducing the number of readers. In order to avoid signal conflicts caused by one reader working on multiple electronic tags simultaneously, the invention adopts an anti-collision algorithm. That is, each tag sets a unique address code, and uses the reader to speak first to send signals to the tags one by one to detect whether the tag is within the monitoring range of the reader. (2) The reader is also equipped with a gear switch that can adjust the transmission power. The reader can set the gear and send signals to the electronic tag. The electronic tag automatically adjusts its own transmission power by judging the content of the received signal. , so that the monitoring range can be adjusted. (3) A low-battery detection chip is installed in the electronic tag. When the power is lower than the rated value, the electronic tag sends a special signal to the reader to inform the user that the corresponding tag has low battery. (4) There is an 8-bit dial switch in the label and it is connected to the main controller of the label. The user can set the address of the new label by adjusting the dial switch, thus realizing the function of adding a new label.

Description of drawings

Fig. 1 is the functional block diagram of reader, alarm, electronic tag of the present invention;

Fig. 2 is a schematic diagram of the reader circuit of the present invention;

Fig. 3 is a schematic diagram of the label circuit of the present invention;

Fig. 4 is a schematic diagram of the alarm circuit of the present invention;

Fig. 5 is the program block diagram of the low power consumption algorithm of label among the present invention;

Fig. 6 is a block diagram of new label recognition program in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

Fig. 1 is a working principle diagram of the present invention, including a reader 1, more than two electronic tags 2, and an alarm unit 3, the reader 1 is connected with the electronic tags 2 through radio frequency communication, and the reader 1 is connected with the alarm unit 3 through wireless communication . When the electronic tags 2 in the system work at the same time, in order to prevent signal conflicts, first set a unique address code for each tag, use the reader 1 to speak first, send signals to the electronic tags 2 one by one, and detect whether the tags are in within the monitoring range of the reader. At the same time, a wireless sending module 7 is installed on the reader 1 , and a wireless receiving module 12 is installed on the alarm unit 3 . When one of the electronic tags 2 is artificially moved out of the monitoring range of the reader 1, the reader 1 notifies the wireless sending module 7 to send a signal to the wireless receiving module 12, and the wireless receiving module 12 controls the alarm to alarm after receiving the signal.

Figures 1 to 4 are the functional block diagrams and circuit schematic diagrams of the reader 1, the electronic tag 2, and the alarm unit 3. The reader 1 includes a reading master controller 4, a reader wireless transmitting and receiving module 5, a first antenna 6, a wireless transmitting Module 7 and second antenna 8, monitoring range selection module 9; the electronic tag 2 includes a tag master controller 16, an electronic tag wireless sending and receiving module 15, a third antenna 14, a low battery detection module 18 and a new tag identification module 17 ; The alarm unit 3 includes an alarm 13 , a wireless receiving module 12 and a fourth antenna 11 .

Reading main controller 4 is connected with first antenna 6 by reader wireless sending and receiving module 5; Reading main controller 4 is connected with second antenna 8 by wireless sending module 7; The antenna 11 is connected; the tag main controller 16 is connected to the third antenna 14 through the electronic tag wireless sending and receiving module 15 .

The method involved in the present invention includes the anti-collision algorithm when multiple tags are applied to the cargo anti-theft alarm at the same time, the monitoring range is adjustable, the low power consumption algorithm prolongs the battery life, the low battery detection, the identification of new tags, the wireless alarm and the high level of the system reliability.

Implementation of anti-collision algorithm: When six electronic tags 2 in the system work at the same time, signal conflicts will occur. The inventors did this by assigning each tag a unique address code. Adopt the way that the reader 1 speaks first, send signals to the electronic tags 2 one by one, and detect whether the tags are within the monitoring range of the reader 1.

The realization of the wireless alarm function: on the hardware, the status of the alarm is controlled through the wireless transceiver module. That is, a wireless sending module 7 is installed on the reader 1 , and a wireless receiving module 12 is installed on the alarm 13 . In terms of software, the following functions are realized by writing program codes: when the electronic tag 2 is artificially moved out of the monitoring range of the reader 1, the reader 1 notifies the wireless sending module 7 to send a signal to the wireless receiving module 12, after the wireless receiving module 12 receives the signal Control alarm 13 to report to the police.

Realization of system reliability: By writing program code, it is set that the reader sends 4 signals to the tag cyclically as one detection cycle. If within the detection period, the reader can receive one or more signals returned by the electronic tag 2 , then it is judged that the electronic tag 2 is within the monitoring range of the reader 1 . Otherwise, it is considered that the electronic tag 2 has been moved out of the monitoring range, and the wireless alarm 13 alarms at the same time.

Realization of the function of adjustable monitoring range: the reader 1 is provided with a monitoring range selection module 9, and the monitoring range selection module 9 is a gear switch capable of adjusting the transmitting power of the reader. Several transmission power levels are set in the reader 1 , once a certain level is set, the reader 1 sends a signal to the electronic tag 2 . The tag electronic tag automatically adjusts its own transmission power by judging the content of the received signal, thereby realizing the adjustable monitoring range.

Realization of the low battery detection function: in hardware, the electronic tag 2 is provided with a low battery detection module 18, and the low battery detection module 18 uses a low battery detection chip, which is connected to the main controller 16 of the label. When the voltage of the electronic tag 2 is lower than 2.7V, that is, when the battery is low, the electronic tag 2 sends a special signal to the reader 1. After the reader 1 receives the special signal, the system operation status display module 10 informs the user that the corresponding tag has been activated. in a low battery state.

Realization of the function of identifying a new label: In hardware, the P1 port of the main label controller 16 is externally connected with an 8-digit dial switch, and the P1 port is set as an input port. By writing the program code, the address of the electronic label 2 is the input value of the P1 port. In this way, when adding a new label after the label is lost, the user can set the address of the new label by adjusting the dial switch.

Fig. 5 is a program block diagram of the tag low power consumption algorithm of the present invention. In order to be able to realize the purpose of low power consumption, the present invention selects the single-chip microcomputer (such as MSP430 series single-chip microcomputer or Mega64) of ultra-low power consumption on hardware, on software, realizes the purpose of low power consumption according to low power consumption algorithm, by writing The program code shortens the working time of the RF chip as much as possible. When the RF chip completes a sending and receiving task, it is turned off, and the single-chip microcomputer enters a low-power mode. When the reader sends the next signal, the single-chip microcomputer and the RF chip are turned on. This cycle continues to minimize power consumption.

Fig. 6 is a block diagram of new label recognition program in the present invention. In terms of hardware, the P1 port of the main label controller 16 is externally connected with an 8-digit dial switch, and the P1 port is set as an input port. By writing the program code, read the P1 port information, and use the result as the address of the electronic label 2. In this way, when adding a new label after the label is lost, the user can set the address of the new label by adjusting the dial switch.

Claims (8)

1. the portable article guard against theft and alarm system based on less radio-frequency comprises a reader (1), plural electronic tag (2) and alarm unit (3); Said reader (1) is connected through radio communication with electronic tag (2), and reader (1) is connected with alarm unit (3) through radio communication;

Said reader (1) comprises reads master controller (4), reader wireless transmission receiver module (5), first antenna (6), wireless sending module (7) and second antenna (8); Reading master controller (4) is connected with first antenna (6) through reader wireless transmission receiver module (5); Reading master controller (4) is connected with second antenna (8) through wireless sending module (7);

Said alarm unit (3) comprises alarm (13), wireless receiving module (12) and the 4th antenna (11), and said alarm (13) is connected with the 4th antenna (11) through wireless receiving module (12);

Said electronic tag (2) comprises label master controller (16), electronic tag wireless transmission receiver module (15), third antenna (14), and said label master controller (16) is connected with third antenna (14) through electronic tag wireless transmission receiver module (15);

It is characterized in that: said reading controller (4) comprises and reads the monitoring range selection module (9) that master controller (4) is connected; It is reader emissive power magnitude regulator that said monitoring range is selected module (9).

2. the article anti-theft warning system based on less radio-frequency according to claim 1 is characterized in that: said reading controller (4) also comprises the LED display module (10) of display system running status.

3. the article anti-theft warning system based on less radio-frequency according to claim 1 is characterized in that: said electronic tag (2) comprises the low electric weight detection module (18) that is connected with label master controller (16); Low electric weight detection module (18) comprises low electric weight detection chip, and low electric weight detection chip input end is connected with the voltage end of electronic tag (2), and output terminal is connected with label master controller (16).

4. the article anti-theft warning system based on less radio-frequency according to claim 3; It is characterized in that: said electronic tag (2) comprises a new tag recognition module (17) that is connected with label master controller (16) input end, and new tag recognition module (17) is a toggle switch.

5. the control method of the portable article guard against theft and alarm system based on less radio-frequency according to claim 1 is characterized in that comprising the steps: at least

A, set address code for each electronic tag (2), regulate the monitoring range of reader (1);

B, reader (1) are taked the mode of speech earlier, send signal for one by one each electronic tag (2), and whether detected electrons label (2) is at the monitoring range of reader (1);

C, when electronic tag (2) is moved out of the monitoring range of reader (1); Reader (1) is through reader wireless transmission receiver module (5); Receive the alerting signal that electronic tag (2) sends; Reader (1) notice wireless sending module (7) sends signal and gives wireless receiving module (12), and wireless receiving module (12) is controlled alarm (13) warning after receiving signal.

6. the control method of the portable article guard against theft and alarm system based on less radio-frequency according to claim 5; It is characterized in that: among the said step B; The process circulation of sending signal for one by one all electronic tags (2) with reader (1) is a sense cycle 2～6 times; If in the sense cycle, the signal that reader (1) can be received 1 time or once above electronic tag (2) returns judges that then electronic tag (2) is in the monitoring range of reader (1); Reader (1) gets into next sense cycle, otherwise reader (1) judgement electronic tag (2) is moved out of the monitoring range of reader (1).

7. the control method of the portable article guard against theft and alarm system based on less radio-frequency according to claim 6; It is characterized in that among the said step B; The interim that reader (1) transmits, the radio frequency chip of device is in off-mode, and single-chip microcomputer is in low-power consumption mode.

8. the control method of the portable article guard against theft and alarm system based on less radio-frequency according to claim 5; The monitoring range that it is characterized in that reader in the described steps A (1) carries out through following steps; Set the emissive power of several gears for earlier reader (1); In case after reader (1) was set certain fixing gear, reader (1) sent signal and gives electronic tag (2), electronic tag (2) is according to the signal content that receives; Automatically regulate the emissive power of self, realize that monitoring range is adjustable.

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