CN2884169Y

CN2884169Y - Low temp. preservation temp. recording device based-on electronic label

Info

Publication number: CN2884169Y
Application number: CN200620025452.6U
Authority: CN
Inventors: 王以忠; 谢丁龙; 南忠良; 张锐; 卢修竹
Original assignee: Tianjin University of Science and Technology
Current assignee: Tianjin University of Science and Technology
Priority date: 2006-03-03
Filing date: 2006-03-03
Publication date: 2007-03-28
Anticipated expiration: 2016-03-03

Abstract

The utility model discloses a low temperature preserving temperature recorder based on an electronic label, which provides a low temperature preserving temperature recorder with strong adaptability, simple and flexible structure and low cost. A temperature transmitter is connected with a microcontroller through an A/D converter; a real-time clock generator is connected with the microcontroller double-line serial bus interface; the microcontroller is connected with an electronic label read-write head through a synchronous serial interface; wireless communication is arranged between the electronic label read-write head and the electronic label; the microcontroller is used to read time, date data and temperature data, and to write the time, the date data and the temperature data into the electronic label through the electronic label read-write head; the real-time clock generator and the microcontroller are connected with power supply respectively. Since the prior electronic label read-write head and the electronic label can be used, the utility model has the advantages of having simple and flexible structure, being easy to configure, and having strong applicability and low cost.

Description

Preservation by low temperature temperature recording unit based on electronic tag

Technical field

The utility model relates to a kind of temperature recording unit, in particular, relates to a kind of temperature recording unit that uses the electronic tag record data.

Background technology

Preservation by low temperature is long, a kind of preferably method of effect of freshness date in the present food fresh keeping mode.Its principle is to utilize various devices that food temperature is dropped to below the certain numerical value, with the influence of minimizing food physics, chemical change and microbial reproduction, thereby keeps it fresh.Therefore, in transportation and storage process, just need the residing environment temperature of record FF.

Electronic tag (RFID) technology is a kind of technology of comparative maturity, its feature is a kind of non-contacting automatic identification technology, its principle is to utilize radiowave to transmit identifying information, has been widely used in various fields such as industrial automation, business automation, communications and transportation control and management.

At present, the preservation by low temperature temperature recording unit is made up of temperature sensor, A/D converter, microcontroller and display, it can preserve the temperature variation data of a period of time, the temperature variations of arbitrary time before managerial personnel can check at any time by display.But this kind device does not also combine with electronic tag (RFID) technology, and the temperature that is write down can only self show, can not swap data, seriously define the field of its application.

The utility model content

The utility model is in order to provide a kind of adaptability strong, and is simple in structure, flexible, the preservation by low temperature temperature recording unit based on electronic tag that cost is low.

The utility model is achieved through the following technical solutions:

A kind of preservation by low temperature temperature recording unit based on electronic tag, comprise temperature sensor, A/D converter and microcontroller, it is characterized in that, also comprise electronic label read-write head and electronic tag, described temperature sensor is connected with microcontroller by A/D converter, the real-time clock generator is connected with microcontroller by the two-wire serial bus interface, and microcontroller is connected with the electronic label read-write head by synchronous serial interface, carries out radio communication between electronic label read-write head and the electronic tag; Described microcontroller is used for readout time, date data and temperature data, and by the electronic label read-write head time, date data and temperature data is write electronic tag; Described real-time clock generator is connected with power supply respectively with microcontroller.

Described real-time clock generator is connected with standby power supply.

The utlity model has following technique effect:

Owing to can use existing electronic label read-write head and electronic tag, structure is flexible, is easy to configuration, and applicability is strong, no matter is small-scale tentative introducing, and still large-scale system introduces and all can realize.And simple in structure, cost is low, can be widely used in the logistics field.

Description of drawings

Fig. 1 is the circuit diagram based on the preservation by low temperature temperature recording unit of electronic tag.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in detail.

The circuit diagram of the preservation by low temperature temperature recording unit based on electronic tag of the present utility model as shown in Figure 1, comprise temperature sensor, A/D converter, microcontroller, electronic label read-write head (being the RFID read/write head) and electronic tag, temperature sensor is connected with microcontroller by A/D converter, and real-time clock generator RTC is by two-wire serial bus interface I ²C is connected with microcontroller, and microcontroller is connected with the electronic label read-write head by synchronous serial interface SPI, carries out radio communication between electronic label read-write head and the radio frequency identification RFID.Microcontroller is used for readout time, date data and temperature data, and by the electronic label read-write head time, date data and temperature data is write electronic tag.The real-time clock generator is connected with power supply respectively with microcontroller.

In actual use, can use the microcontroller that microcontroller and A/D converter, two-wire serial bus interface, synchronous serial interface are become one, as ATMEGA16 etc.

What temperature sensor adopted is 100K Ω negative tempperature coefficient thermistor, and resistance value raises with temperature and diminishes, and connected mode adopts bridge diagram, and it will be exported with voltage signal because of the electric bridge imbalance that temperature variation causes.

The real-time clock generator adopts DS1337, the data that temperature sensor is gathered and sent need the collection date and time of additional temp simultaneously, DS1337 adopts the data of two-way two buses to transmit working method, be that chip is under the control of serial clock, receive command word or the address date that sends from microcontroller by the serial data termination, also can give microcontroller by data such as serial data end date of shipping, time, interrupt request singals.

Primary power is chargeable secondary cell, for the power supply of whole preservation by low temperature thermograph system, comprising the power supply of RTC.Real-time clock generator RTC also is connected with standby power supply, and when primary power did not have electricity, standby power supply began the power supply for RTC, to prevent losing of time data.

Two-wire serial bus interface I ²C can with the RTC swap data, receive the time data among the RTC, be attached on the temperature data.

The RFID read/write head is ZLG500, and major function is to read the record position of temperature data in the RFID label by radio communication, receives write command and the temperature data that microcontroller sends by the UART interface, and temperature data is write in the RFID label.

The RFID label adopts passive label, as PHILIPS MF1ICS50, by data designated form storage temperature data.

Microcontroller response is from the interrupt request of real-time clock generator, from real-time clock generator readout time, date data, reads temperature data from temperature sensor.When microcontroller is communicated by letter with the electronic label read-write head, at first connect, after the success, obtain writing in the electronic tag address of data again by synchronous serial interface, then the data that write are sent to the electronic label read-write head, enter low power consumpting state at last.

Although relate to a kind of preservation by low temperature temperature recording unit and carried out special description disclosed based on electronic tag with reference to embodiment, embodiment described above is illustrative and not restrictive, under the situation that does not break away from spirit and scope of the present utility model, all variations and modification are all within scope of the present utility model.

Claims

1, a kind of preservation by low temperature temperature recording unit based on electronic tag, comprise temperature sensor, A/D converter and microcontroller, it is characterized in that, also comprise electronic label read-write head and electronic tag, described temperature sensor is connected with microcontroller by A/D converter, the real-time clock generator is connected with microcontroller by the two-wire serial bus interface, and microcontroller is connected with the electronic label read-write head by synchronous serial interface, carries out radio communication between electronic label read-write head and the electronic tag; Described microcontroller is used for data and temperature data readout time, and time data and temperature data are sent to the electronic label read-write head; Described real-time clock generator is connected with power supply respectively with microcontroller.

2, the preservation by low temperature temperature recording unit based on electronic tag according to claim 1 is characterized in that, described real-time clock generator is connected with standby power supply.