CN216412158U - Library collection book positioning device - Google Patents
Library collection book positioning device Download PDFInfo
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- CN216412158U CN216412158U CN202120946354.0U CN202120946354U CN216412158U CN 216412158 U CN216412158 U CN 216412158U CN 202120946354 U CN202120946354 U CN 202120946354U CN 216412158 U CN216412158 U CN 216412158U
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Abstract
The utility model discloses a library collection book positioning device, which comprises a microcontroller, a display, a power switch module, a level conversion module, a radio frequency driving circuit and a radio frequency decoding circuit, wherein the display, the power switch module, the level conversion module, the radio frequency driving circuit and the radio frequency decoding circuit are connected with the microcontroller; the communication module is connected with the power switch module and the level conversion module; the device also comprises a memory connected with the microcontroller and the power switch module; the radio frequency driving circuit and the radio frequency decoding circuit comprise a driving circuit connected with the radio frequency coil, a rectifying circuit, a filtering module and a comparator circuit which are sequentially connected, and a proximity detection circuit connected with the filtering module. The utility model adopts the passive low-frequency card, has no service life problem, and the flexible label is convenient to be attached to any page of a book and has large storage capacity.
Description
Technical Field
The utility model relates to the technical field of library management and radio frequency control, in particular to a library collection book positioning device.
Background
The efficient and accurate positioning index for library books is an important guarantee for improving library management efficiency and improving the experience of library entering of borrowers. During traditional library's management, need managers to carry out the bent of regular classification to books, consumed a large amount of manpower and materials, the reader also probably takes at will simultaneously, causes the books dislocation.
Aiming at the problems, the library management industry commonly uses the following solution: firstly, bar codes are scanned to confirm the entrance and exit of the museum, and book collection/sequential management is carried out manually. The method is the most traditional book management method, and only solves the problem that books go in and out of a house, and a large amount of manpower is consumed for arranging and indexing the books; secondly, an ultra-wideband positioning terminal is adopted to realize the positioning of each book. Although the method can realize the accurate positioning of books, an active positioning terminal needs to be installed on each book, the cost is extremely high, the thickness and the volume of the terminal are large, the battery is needed for power supply, and the service life is limited.
Disclosure of Invention
In order to solve the problems, the utility model provides a positioning device for library collection books, so that library book management is low in cost, accurate in positioning and easy to realize.
A library collection book positioning device comprises a microcontroller, a display, a power switch module, a level conversion module, a radio frequency driving circuit and a radio frequency decoding circuit, wherein the display, the power switch module, the level conversion module, the radio frequency driving circuit and the radio frequency decoding circuit are connected with the microcontroller; the communication module is connected with the power switch module and the level conversion module; the device also comprises a memory connected with the microcontroller and the power switch module; the radio frequency driving circuit and the radio frequency decoding circuit comprise a driving circuit connected with the radio frequency coil, a rectifying circuit, a filtering module and a comparator circuit which are sequentially connected, and a proximity detection circuit connected with the filtering module.
Further, the proximity detection circuit is used for continuously transmitting the PWM wave if the card exists when the filtered voltage division signal is larger than a threshold value; and when the voltage division signal is smaller than the threshold value, the device enters a standby state to reduce the power consumption of the whole machine.
Further, the driving circuit is used for enabling an input signal to pass through two transistors with interconnected gates, keeping the signal passing through the two transistors and an original signal in phase and providing driving power for the radio frequency coil.
Furthermore, the filtered circuit branch enters the non-inverting and inverting input ends of the comparator after being subjected to voltage division by the two resistors, and the comparator outputs a demodulated signal.
Further, a radio frequency tag is arranged on the book side and is a passive low-frequency T5557 card.
Further, the driving circuit comprises a first resistor, a second resistor, a third resistor, a first transistor, a second transistor and an input signal, one end of the first resistor is connected with one end of the second resistor, an emitter of the first transistor is connected with the other end of the first resistor, a base of the first transistor is connected with a base of the second transistor and is connected with one end of the third resistor, the other end of the second resistor is connected with an emitter of the second transistor, a collector of the first transistor is connected with a power supply, and a collector of the second transistor is connected with the ground.
Further, the communication module adopts the thing networking module of narrowband communication technology for borrow the information with books and send to library management system, the communication module passes through the control of switch module and in order to realize the low-power consumption under the standby state.
The utility model has the following technical effects:
(1) the book side radio frequency tag adopts a passive low-frequency T5557 card, does not need a battery for power supply, and does not have the problem of practical service life;
(2) the radio frequency tag can adopt a flexible tag, and is convenient to be attached to any page of a book;
(3) the storage capacity is large, 2^64=18446744073709551616 tags are supported, 32 ^ 7bit data content can be stored, and information such as book information and borrowing history can be conveniently stored in the radio frequency tag;
(4) the bookshelf manager adopts low-power consumption NB-IoT communication, standby power consumption is less than 10uA, one ER34615 type lithium sub-battery can be used for more than 10 years when power is supplied, and data bytes are uploaded to a library management system, so that centralized management is realized;
(5) the book shelf positioning is realized, and the manual shelving is avoided.
Drawings
FIG. 1 is a schematic view of a library collection book positioning apparatus of the present invention;
FIG. 2 is a schematic diagram of a library collection book positioning circuit of the present invention;
FIG. 3 is a schematic diagram of the RF driver and RF decoding circuit of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the present invention may be implemented in various different modes, and those skilled in the art will readily recognize that the modes and details of the present invention can be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited to the description of the embodiments. Note that in the structure of the present invention described below, reference numerals indicating the same parts are used in common in different drawings.
Note that in this specification and the like, the term "connected" means "electrically connected" and corresponds to a state capable of supplying or transmitting a current, a voltage, a potential, a signal, a charge, or the like. Therefore, the "connected" state refers not only to a directly connected state but also to an indirectly connected state through, for example, a wiring, a conductive film, a resistor, a diode, a transistor, or a switching element.
As shown in fig. 1, the system is composed of bookshelves, a bookshelf manager installed on each bookshelf (area), books, and passive radio frequency tags attached to the books.
The radio frequency tag stores therein: book numbering, book state, and bookshelf (region) numbering of the book;
the bookshelf manager has the following attributes: the bookshelf is provided with a bookshelf number, a book number list stored in the bookshelf and a borrowing state, an NB-IoT radio frequency module, an antenna, a display screen, a transmitting coil, a driving circuit, a radio frequency decoding circuit and an ER34615 type lithium sub-battery for power supply, and has the characteristic of low power consumption;
book borrowing operation flow: after a reader takes a book from the bookshelf, the book is placed on a scanning surface (within 10 cm) of a bookshelf manager, the bookshelf manager transmits 125KHZ high-frequency pulses through a coil, and provides certain driving power for a transmitting coil; meanwhile, the transmitting coil induces a Manchester code data stream returned by the book radio frequency tag, so that the serial number of the book is acquired, and the state of the book is set to be lent in the bookshelf manager; then, writing the updated book state into the book radio frequency tag through the high-frequency code stream to finish borrowing;
book changing operation flow: a reader places a book on a scanning surface (within 10 cm) of a bookshelf manager, the bookshelf manager transmits 125KHZ high-frequency pulses through a coil, and provides certain driving power for a transmitting coil; meanwhile, the transmitting coil induces a Manchester code data stream returned by the book radio frequency tag, so that the serial number of the book is obtained, and whether the book belongs to the bookshelf or not is judged. If the number belongs to the number, the reader is prompted to arrange according to the number through the display screen. Setting the book status as being in a museum within the bookshelf manager; then, writing the updated book state into the book radio frequency tag through the high-frequency code stream to finish book returning; if not, the reader is prompted to place the book shelf in the designated book shelf.
As shown in fig. 2, the functions of the parts are as follows:
a microcontroller: the data processing core of the manager is communicated and connected with other related components through interfaces such as an internal SPI, a DO, a serial port and an I2C, and an FM3316 type microcontroller is adopted in the utility model;
NB-IoT module: the internet of things module adopting a narrow-band communication technology is used for sending book borrowing information to a library management system, and the module needs to be controlled through a PMOS power switch to realize low power consumption in a standby state; meanwhile, as the IO level of the module is 1.8V, the module also needs a 3.3-1.8 level conversion chip to be connected with a TX/RX port of the microcontroller, and the utility model adopts an ME3616C1A type NB-IoT module;
128 segment code liquid crystal display: the device is connected with the microcontroller through COM and SEG pins and used for displaying related information;
24C 25: the EEPROM is mainly used for storing relevant data and is connected with the microcontroller through SCI and SDA pins. The memory needs to be controlled by a PMOS power switch to realize low power consumption in a standby state;
radio frequency drive circuit and radio frequency decoding circuit: the specific circuit structure of the related circuit for driving the radio frequency coil and the radio frequency tag to return information processing is shown in fig. 3:
j2 radio frequency coil; the IC _ PWM is a 125khz square wave signal, and after being processed by the first triode 1 and the second triode 3, the current driving capability of the IC _ PWM reaches 100mA, so that enough driving power is provided for the radio frequency coil;
the driving circuit comprises a first resistor R1, a second resistor R3, a third resistor R2, a first transistor 1, a second transistor 3 and an input signal IC _ PWM, one end of the first resistor R1 is connected with one end of the second resistor R3, the emitter of the first transistor 1 is connected with the other end of the first resistor R1, the base of the first transistor 1 is connected with the base of the second transistor 3 and is connected with one end of the third resistor R2, the other end of the second resistor R3 is connected with the emitter of the second transistor 3, the collector of the first transistor 1 is connected with a power supply, and the collector of the second transistor 3 is connected with the ground.
After the radio frequency transceiving coil induces a signal returned by the radio frequency card, the signal is rectified by a diode D2 and then is processed by a low-pass filter circuit consisting of C5 and R9;
the signal is processed by the C7\ R7 filter circuit and then outputs a Manchester code after radio frequency demodulation after passing through a comparator formed by U1, so that the demodulation of the signal is completed;
IC _ INPUT2 is card approach detection, 10 PWM waves are periodically transmitted in IC _ PWM (in this example, 4 s), the level of the IC _ INPUT2 side is detected, when the level is greater than a certain threshold value, the card is judged to be present, and the PWM waves are continuously transmitted, so that the subsequent card reading and writing operations are realized; when the voltage is less than a certain threshold value, the system directly enters a standby state to reduce the power consumption of the whole machine.
The 125KHZ square wave signal is subjected to first triode 1 and second triode 3 to obtain a signal which keeps the same phase with the original signal, the signal is boosted to a driving capability of 100mA, and the signal is subjected to current limiting through resistor R8 and then output to a J2 radio frequency coil interface;
after the radio frequency coil induces the radio frequency signal output by the radio frequency card, the radio frequency signal is rectified by a diode D2, and the rectified signal is changed into a direct current signal;
c5\ R9 forms a passive low-pass filter circuit, low-pass filtering is carried out on the rectified signal, the filtered signal forms a signal IC _ INPUT2 after voltage division between resistors 4 and 2, when the signal is larger than a certain threshold value, the card is judged to be present, PWM waves are continuously emitted, and subsequent card reading and writing operations are realized; when the voltage is less than a certain threshold value, the system directly enters a standby state to reduce the power consumption of the whole machine;
the signal processed by the circuit is divided into two paths, one path enters the 3 end of the comparator U1 after being subjected to voltage division by R5/R4, the other path directly enters the 1 end of the comparator U1, the size difference between the non-inverting input end and the inverting input end of the comparator U1 is caused due to the change of the charging and discharging time constant, and finally the comparison output pin of the comparator U1 outputs the demodulated square wave model.
The book side radio frequency tag adopts a passive low-frequency T5557 card, does not need a battery for power supply, and does not have the problem of service life; the radio frequency tag can adopt a flexible tag, and is convenient to be attached to any page of a book; the book shelf positioning is realized, and the manual shelving is avoided.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and those skilled in the art who read the present application can make various modifications or alterations of the present invention by referring to the above-mentioned embodiments within the scope of the claims of the present application.
Claims (7)
1. A library collection book positioning device is characterized by comprising a microcontroller, a display, a power switch module, a level conversion module, a radio frequency driving circuit and a radio frequency decoding circuit, wherein the display, the power switch module, the level conversion module, the radio frequency driving circuit and the radio frequency decoding circuit are connected with the microcontroller; the communication module is connected with the power switch module and the level conversion module; the device also comprises a memory connected with the microcontroller and the power switch module; the radio frequency driving circuit and the radio frequency decoding circuit comprise a driving circuit connected with the radio frequency coil, a rectifying circuit, a filtering module and a comparator circuit which are sequentially connected, and a proximity detection circuit connected with the filtering module.
2. The apparatus of claim 1, wherein the proximity detection circuit is configured to continue to emit the PWM wave for the card when the filtered divided signal is greater than the threshold value; and when the voltage division signal is smaller than the threshold value, the device enters a standby state to reduce the power consumption of the whole machine.
3. The apparatus of claim 1, wherein the drive circuit is configured to provide the drive power to the rf coil by coupling an input signal through two transistors having bases interconnected, the signal through the two transistors and the original signal remaining in phase.
4. The apparatus of claim 1, wherein the filtered circuit is divided by two resistors and then enters non-inverting and inverting inputs of the comparator circuit, and the comparator circuit outputs the demodulated signal.
5. The device according to any of claims 1-4, characterized in that the book side is provided with a radio frequency tag, being a passive low frequency T5557 card.
6. The apparatus of claim 3, wherein the driving circuit comprises a first resistor, a second resistor, a third resistor, a first transistor, a second transistor, and an input signal, wherein one end of the first resistor is connected to one end of the second resistor, an emitter of the first transistor is connected to the other end of the first resistor, a base of the first transistor is connected to a base of the second transistor and to one end of the third resistor, the other end of the second resistor is connected to an emitter of the second transistor, a collector of the first transistor is connected to a power source, and a collector of the second transistor is connected to ground.
7. The device of claim 1, wherein the communication module is an internet of things module adopting a narrow-band communication technology and used for sending book borrowing information to the library management system, and the communication module is controlled by the power switch module to achieve low power consumption in a standby state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120946354.0U CN216412158U (en) | 2021-05-06 | 2021-05-06 | Library collection book positioning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120946354.0U CN216412158U (en) | 2021-05-06 | 2021-05-06 | Library collection book positioning device |
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| Publication Number | Publication Date |
|---|---|
| CN216412158U true CN216412158U (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120946354.0U Expired - Fee Related CN216412158U (en) | 2021-05-06 | 2021-05-06 | Library collection book positioning device |
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|---|---|
| CN (1) | CN216412158U (en) |
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2021
- 2021-05-06 CN CN202120946354.0U patent/CN216412158U/en not_active Expired - Fee Related
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Granted publication date: 20220429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |