CN111860714A - Temperature monitoring system based on RFID - Google Patents
Temperature monitoring system based on RFID Download PDFInfo
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- CN111860714A CN111860714A CN202010653898.8A CN202010653898A CN111860714A CN 111860714 A CN111860714 A CN 111860714A CN 202010653898 A CN202010653898 A CN 202010653898A CN 111860714 A CN111860714 A CN 111860714A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0716—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
- G06K19/0717—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising a sensor or an interface to a sensor the sensor being capable of sensing environmental conditions such as temperature history or pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/08—Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
- G06Q10/083—Shipping
- G06Q10/0832—Special goods or special handling procedures, e.g. handling of hazardous or fragile goods
Abstract
The invention provides a temperature monitoring system based on RFID, which comprises an RFID temperature label, a reader and a data management server; the RFID temperature tag is attached to the target object and bears the electronic code of the target object and the temperature data on the target object; the RFID temperature tag is formed by a plurality of low-power-consumption modules and comprises a power supply module, a single chip microcomputer module, a temperature sensor module, a radio frequency storage module and an antenna module; the temperature precision controlled by the temperature sensor module is +/-1 ℃; the reader connects the RFID temperature tags with the data management server and transmits the electronic codes and the temperature data of the read or written one or more RFID temperature tags to a data management system of the data management server; and the data management server screens and processes the acquired electronic codes and temperature data so as to meet the requirements of users on specific work. By implementing the invention, the cruising ability of the RFID label is improved, and the temperature precision is improved, thereby overcoming the defects and the defects of the traditional RFID temperature measuring device.
Description
Technical Field
The invention relates to the technical field of Internet of things and the technical field of cold-chain logistics, in particular to a temperature monitoring system based on RFID.
Background
The development of cold-chain logistics in China lags behind that of western developed countries, and the problems of product quality reduction and the like are caused because low-temperature medicines and foods often lack reliable temperature monitoring in the cold-chain transportation process. As the sunward industry, the cold chain logistics industry in China is more innovated under the large background of relying on the Internet plus, and supplements the existing cold chain theory and technology.
In the technical aspect of cold-chain logistics, foreign scholars are more invested in fresh-keeping technologies such as cold-chain commodity storage and the like; domestic scholars mainly research technologies such as RFID and online temperature control management systems. The application of the RFID technology in the processing, storage, transportation and sales management links of the fruit and vegetable cold-chain logistics is explained by students. For example, von Heiping, Wumeimeimei and the like (2017) focus on the loss of fresh fruits and vegetables in the cold chain transportation process, a ZigBee technology-based fruit and vegetable cold chain logistics real-time monitoring system is established, and the online tracking of the temperature and humidity of the fruits and vegetables is realized; for another example, Wu Dongfei provides a set of food cold chain intelligent monitoring system based on an Android platform, and historical cold chain information of food can be inquired in a palm manner by installing software on an Android mobile phone, so that powerful guarantee is provided for cold chain food safety.
In the process of reading related documents, although many researches on cold-chain logistics and RFID temperature monitoring systems are found in China, many RFID temperature measuring devices based on single-chip microcomputers are also seen, most of the researches are based on theoretical and experimental properties, the endurance of RFID tags is poor, and the measured temperature precision is low.
Therefore, a temperature monitoring system based on RFID is needed to improve the cruising ability of the RFID tag and improve the temperature accuracy, so as to solve the defects of the existing RFID temperature measuring device.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a temperature monitoring system based on RFID, which improves the cruising ability of an RFID tag and improves the temperature accuracy, thereby solving the defects and shortcomings of the existing RFID temperature measuring devices.
In order to solve the above technical problem, an embodiment of the present invention provides a temperature monitoring system based on an RFID, including an RFID temperature tag, a reader, and a data management server, which are connected in sequence; wherein the content of the first and second substances,
the RFID temperature tag is attached to a target object and used for bearing an electronic code of the target object and temperature data of the target object; the RFID temperature tag is formed by a plurality of low-power-consumption modules and comprises a power supply module, a single chip microcomputer module, a temperature sensor module, a radio frequency storage module and an antenna module; the power supply module is connected with the first end of the single chip microcomputer module and one end of the temperature sensor module and used for supplying power by direct-current voltage; the other end of the temperature sensor module is connected with the second end of the single chip microcomputer module and used for acquiring the temperature of a target object and realizing the control of the temperature precision of +/-1 ℃; the third end of the single chip microcomputer module is connected with one end of the radio frequency storage module and is used for bearing the electronic code of the target object, receiving the temperature of the target object acquired by the temperature sensor module and further forwarding the electronic code and the temperature data of the target object to the radio frequency storage module; the other end of the radio frequency storage module is connected with one end of the antenna module and used for receiving, storing and forwarding the electronic code and the temperature data of the target object; the other end of the antenna module is connected with the reader and used for forwarding the electronic code and the temperature data of the target object to the reader;
The reader is used for connecting the RFID temperature tags with the data management server and transmitting the read or written electronic codes and temperature data of one or more RFID temperature tags to a data management system of the data management server;
and the data management server is used for screening and processing the acquired electronic codes and temperature data so as to meet the requirements of users on specific work.
The single chip microcomputer module is of an STM8L101F3P6 model of Italian semiconductor company, standby power consumption is 35.04mAh, working power consumption is 13.63mAh, and total power consumption is 48.67 mAh.
The temperature sensor module adopts TMP112 of Texas instrument, the standby power consumption is 17.52mAh, the working power consumption is 0.19mAh, and the total power consumption is 17.71 mAh.
The radio frequency storage module adopts a model M24LR04E radio frequency chip, and the power consumption of the read-write work is 11.71 mAh.
The antenna module adopts a square antenna with the side length of 31mm, the number of the square antenna is 9, the thickness of the square antenna is 1oz, and the line width and the line interval are both 0.254 mm.
The power module is a 3V CR2016 button battery with a rated capacity of 75 mAh.
Wherein, the reader is fixed or handheld.
The embodiment of the invention has the following beneficial effects:
the RFID temperature tag is formed by a plurality of low-power-consumption modules, and comprises a power supply module, a single chip microcomputer module, a temperature sensor module, a radio frequency storage module and an antenna module, wherein the temperature sensor module realizes the control of the temperature precision of +/-1 ℃, so the cruising ability of the RFID temperature tag is improved, the temperature precision is improved, and the defects and the shortcomings of the conventional RFID temperature measuring device are overcome.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic diagram of a system architecture of an RFID-based temperature monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a system structure of an RFID temperature tag in an RFID-based temperature monitoring system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the circuit structure of the RFID temperature tag of FIG. 2;
fig. 4 is a schematic structural diagram of the antenna module in fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, in an embodiment of the present invention, an RFID-based temperature monitoring system is provided, which includes an RFID temperature tag 1, a reader 2, and a data management server 3, which are connected in sequence; wherein the content of the first and second substances,
the RFID temperature tag 1 is attached to a target object and used for bearing an electronic code of the target object and temperature data of the target object; the RFID temperature tag 1 is formed by a plurality of low-power-consumption modules, and comprises a power supply module 11, a singlechip module 12, a temperature sensor module 13, a radio frequency storage module 14 and an antenna module 15; the power module 11 is connected with the first end of the single chip microcomputer module 12 and one end of the temperature sensor module 13, and is used for supplying power by direct-current voltage; the other end of the temperature sensor module 13 is connected with the second end of the singlechip module 12 and is used for acquiring the temperature of a target object and realizing the control of the temperature precision of +/-1 ℃; the third end of the single chip microcomputer module 12 is connected with one end of the radio frequency storage module 14, and is used for bearing the electronic code of the target object, receiving the temperature of the target object obtained by the temperature sensor module 13, and further forwarding the electronic code and the temperature data of the target object to the radio frequency storage module 14; the other end of the radio frequency storage module 14 is connected with one end of the antenna module 15 and is used for receiving, storing and forwarding the electronic code and the temperature data of the target object; the other end of the antenna module 15 is connected with the reader 2 and used for forwarding the electronic code and the temperature data of the target object to the reader 2;
The reader 2 is used for connecting the RFID temperature tags 1 with the data management server 3 and transmitting the read or written electronic codes and temperature data of one or more RFID temperature tags 1 to a data management system of the data management server 3; wherein, the reader 2 is fixed or handheld;
and the data management server 3 is used for screening and processing the acquired electronic codes and temperature data so as to meet the requirements of users on specific work.
The working principle of the temperature monitoring system based on the RFID in the embodiment of the invention is that the RFID temperature tag 1 can receive the radio frequency signal sent by the reader 2 within the effective reading range of the reader 2, and through the coupling effect, the RFID temperature tag 1 can obtain the energy (suitable for passive tags, and part of active tags can actively send the radio frequency signal through an internal power supply) required for sending the electronic code and the temperature data stored in the chip and the time sequence meeting the related protocol. The reader 2 and the RFID temperature tag 1 can perform mutual data interaction, wherein the reader 2 transmits information to the RFID temperature tag 1 by using methods such as code modulation, carrier gap or pulse position modulation and the like; the electronic code and temperature data stored by the RFID temperature tag 1 are transmitted to the reader 2 by a method of load modulation of a carrier wave. Finally, the reader 2 reads and decodes the information, and then sends the information to the data management server 3 through the communication interface for screening and processing so as to meet the requirement of a user on specific work, thereby achieving the aim of identification.
In the embodiment of the present invention, according to design requirements, the designed RFID temperature tag 1 needs to have low power consumption and capability of normally operating at a low temperature. Generally, almost all chips can support low-temperature operation, so low-temperature resistance is not taken as a key point, power consumption is mainly reduced, and endurance is mainly taken as the center of gravity of hardware model selection. The power consumption of the hardware generally occurs in two situations of standby and normal operation, and the power consumption is calculated according to the two situations, wherein the annual standby power consumption of the hardware is shown as the formula (0-1):
the annual operating power consumption of the hardware is shown as the formula (0-2):
it should be noted that, in the formula, the unit of idle current and working current is default to μ a, the unit of standby power consumption and working power consumption is default to mAh, and the unit of working time is default to s; the power consumption of the two formulas is not energy, but lost capacity, and the endurance time is more visual in consideration of the battery capacity; according to the regulation of the national standard GB/T24616-2009, the time interval of the recording points of the temperature measuring equipment is controlled within 15min, and the hardware is designed to work once every 15min for 1s once.
Therefore, all module designs of the RFID temperature tag 1 are computationally selected with reference to equations (0-3) and (0-2), and the specific selection is as follows:
(1) The power module 11 is a dynamic guarantee for the operation of the RFID temperature tag 1, and subjectively, it is desirable that the higher the power capacity, the better the power capacity, and the better the power capacity can support the end of the life of the whole RFID temperature tag, but batteries meeting such requirements are often thick and expensive, such as lead storage batteries. Therefore, it is impractical to overtake a long endurance, and the power module needs to be both bulky and capacitive, and also needs to be designed with much consideration to the design budget.
In combination with the above factors, a 3V CR2016 coin cell battery with a rated capacity of 75mAh was selected. As a power supply, the RFID temperature tag has small volume and considerable capacity, and is suitable for long-time work of the RFID temperature tag.
(2) The single chip microcomputer module 12 adopts STM8L series single chip microcomputers, the working voltage range is 1.65V-3V, and the single chip microcomputers can work normally as long as batteries are not seriously damaged. According to the selection manual screening, STM8L101F3P6 is most preferable, and is a chip with the lowest power consumption of STM8L series, and has four working modes: run, Wait, Active-hash, and hash modes. Selecting an Active-hash mode during standby, taking the maximum standby current of 2 muA under the conventional environmental condition, continuously working for two years, referring to the formula (0-1), and having the standby power consumption of 35.04 mAh; when the device works, a Run mode is selected, the main frequency is 2MHz, the maximum working current is 700 muA, the device works for two years continuously, the reference formula (0-2) is adopted, and the working power consumption is 13.63 mAh; the total power consumption between two years was 48.67mAh, within an acceptable range.
Therefore, the model finally adopted by the single chip microcomputer module 12 is STM8L101F3P6 of Italian semiconductor company, the standby power consumption is 35.04mAh, the working power consumption is 13.63mAh, and the total power consumption is 48.67 mAh.
(3) The temperature sensor module 13 is a texas instruments TMP 112. Although the STTS75 is the same manufacturer as the selected STM8L single-chip microcomputer, the compatibility is better and the price is better, and the minimum working voltage is 2.7V and is too close to the power supply 3V. Voltage fluctuations may cause the TMP112 to cease operation and thus the TMP112 is a better choice. The power consumption rule of the temperature sensor is the same as that of the single chip microcomputer, the standby power consumption is 17.52mAh, the working power consumption is 0.19mAh and the total power consumption is 17.71mAh by referring to an equation (0-1) and an equation (0-2) if the temperature sensor works continuously for two years.
(4) The rf memory module 14 preferably has both an rf interface and a memory interface, allowing for rf and memory integration. In addition, the system needs to meet the ISO15693 protocol, and after screening, M24LR series are selected as suitable choices, and the types of the M24LR64 and M24LR04 can be selected. The design selection uses a single chip pin to supply power to the M24LR, a pin can be selected to be turned off in standby, and the energy for reading data is provided by a reader.
Therefore, the rf memory module 14 uses an rf chip of model M24LR04E, which consumes power only in the read/write mode, the maximum current is 600 μ a, and the power consumption for read/write operation is 11.71mAh according to equation (0-2).
(5) The antenna module 15 adopts a square antenna with the side length of 31mm, the square antenna has 9 turns in total, the thickness is 1oz, and the line width and the line spacing are both 0.254 mm.
Fig. 3 is a schematic diagram of a circuit structure of the RFID temperature tag. The whole design of the RFID temperature tag 1 adopts three chips, two interfaces and one antenna, and the STM8L single chip, the M24LR radio frequency chip and the temperature sensor are communicated through a I C protocol, so that the structure is simple. The I C bus has only two signal lines, a bidirectional data line SDA and a clock line SCL. Since the protocol employs an open-drain mechanism, a 4.7K Ω resistor is typically required to be connected to the IC interface to generate a high level in circuit design planning. The IC device is divided into a master device and a slave device, wherein an STM8L chip is controlled by programming codes and serves as a master chip; the other two chips are controlled by a single chip and are used as slave devices.
Because M24LR64 standby current is great, for promoting continuation of journey, the chip passes through the singlechip pin control power supply. The antenna plays a role of electromagnetic wave transformation and generally works in a resonance state; the whole antenna circuit is formed by connecting an internal 28.5pF equivalent capacitor of M24LR64 and an external PCB inductive antenna in parallel, and the circuit resonance is calculated as shown in a formula (0-4).
The system operating frequency f is brought in to 13.56MHz, and the theoretical inductance value of the PCB antenna is about 4834 nH. The PCB antenna for matching inductance value considers many factors, such as line width, copper thickness, etc., and the actual situation is difficult to be expressed by a formula. Finally, a square antenna is designed by utilizing a PCB inductance calculation tool.
By continuously changing the coil size, a square antenna with a side length of 31mm was selected. The antenna had a total of 9 turns, a thickness of 1oz, a line width and a line spacing of 0.254mm, and the resulting inductance value was 4.899 muH, as shown in FIG. 4.
The embodiment of the invention has the following beneficial effects:
the RFID temperature tag is formed by a plurality of low-power-consumption modules, and comprises a power supply module, a single chip microcomputer module, a temperature sensor module, a radio frequency storage module and an antenna module, wherein the temperature sensor module realizes the control of the temperature precision of +/-1 ℃, so the cruising ability of the RFID temperature tag is improved, the temperature precision is improved, and the defects and the shortcomings of the conventional RFID temperature measuring device are overcome.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. A temperature monitoring system based on RFID is characterized by comprising an RFID temperature tag, a reader and a data management server which are connected in sequence; wherein the content of the first and second substances,
the RFID temperature tag is attached to a target object and used for bearing an electronic code of the target object and temperature data of the target object; the RFID temperature tag is formed by a plurality of low-power-consumption modules and comprises a power supply module, a single chip microcomputer module, a temperature sensor module, a radio frequency storage module and an antenna module; the power supply module is connected with the first end of the single chip microcomputer module and one end of the temperature sensor module and used for supplying power by direct-current voltage; the other end of the temperature sensor module is connected with the second end of the single chip microcomputer module and used for acquiring the temperature of a target object and realizing the control of the temperature precision of +/-1 ℃; the third end of the single chip microcomputer module is connected with one end of the radio frequency storage module and is used for bearing the electronic code of the target object, receiving the temperature of the target object acquired by the temperature sensor module and further forwarding the electronic code and the temperature data of the target object to the radio frequency storage module; the other end of the radio frequency storage module is connected with one end of the antenna module and used for receiving, storing and forwarding the electronic code and the temperature data of the target object; the other end of the antenna module is connected with the reader and used for forwarding the electronic code and the temperature data of the target object to the reader;
The reader is used for connecting the RFID temperature tags with the data management server and transmitting the read or written electronic codes and temperature data of one or more RFID temperature tags to a data management system of the data management server;
and the data management server is used for screening and processing the acquired electronic codes and temperature data so as to meet the requirements of users on specific work.
2. The RFID-based temperature monitoring system of claim 1, wherein the single chip module is of a model number STM8L101F3P6, which is a company seiko, standby power consumption is 35.04mAh, working power consumption is 13.63mAh, and total power consumption is 48.67 mAh.
3. The RFID-based temperature monitoring system of claim 2, wherein the temperature sensor module is a texas instrument TMP112, a standby power consumption of 17.52mAh, an operating power consumption of 0.19mAh, and a total power consumption of 17.71 mAh.
4. The RFID-based temperature monitoring system of claim 3, wherein the RF memory module is a M24LR04E RF chip, and the power consumption of the read/write operation is 11.71 mAh.
5. The RFID-based temperature monitoring system of claim 4, wherein the antenna module employs a square antenna with a side length of 31mm, the square antenna has 9 turns in total, a thickness of 1oz, and a line width and a line spacing of 0.254 mm.
6. The RFID-based temperature monitoring system of claim 5, wherein the power module is a 3V CR2016 coin cell battery with a 75mAh rated capacity.
7. The RFID-based temperature monitoring system of claim 6, wherein the reader is stationary or handheld.
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| CN202010653898.8A CN111860714A (en) | 2020-07-08 | 2020-07-08 | Temperature monitoring system based on RFID |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005020A (en) * | 2010-04-29 | 2011-04-06 | 苏州世纪泰鼎电子科技有限公司 | Medical medicine cold chain transportation monitoring method based on Internet of things |
| CN201927070U (en) * | 2010-12-24 | 2011-08-10 | 深圳市远望谷信息技术股份有限公司 | Semi-active RFID e-tag with temperature sensor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005020A (en) * | 2010-04-29 | 2011-04-06 | 苏州世纪泰鼎电子科技有限公司 | Medical medicine cold chain transportation monitoring method based on Internet of things |
| CN201927070U (en) * | 2010-12-24 | 2011-08-10 | 深圳市远望谷信息技术股份有限公司 | Semi-active RFID e-tag with temperature sensor |
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Application publication date: 20201030 |