CN102013024B - Grain depot and grain situation wireless monitoring system based on multistage RFID reader-writer network - Google Patents
Grain depot and grain situation wireless monitoring system based on multistage RFID reader-writer network Download PDFInfo
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Abstract
The invention discloses a grain depot and a grain situation wireless monitoring system based on a multistage RFID reader-writer network. A sensing tag is in wireless connection with a front-end reader-writer which is used for wirelessly controlling the sensing tag and receiving a signal of the sensing tag; the front-end reader-writer is in wireless connection with a relay reader-writer which is used for transferring command control words and temperature and humidity information; the relay reader-writer is in wireless connection with a terminal reader-writer which is used for receiving the command control words of an upper computer, and the temperature and humidity information transferred from the relay reader-writer; and the terminal reader-writer is in wireless connection with an upper computer control system which is used for sending the command control words, receiving and processing the grain temperature and humidity information collected by the sensing tag. The system can wirelessly trace, measure and monitor the temperature and humidity in each grain bin in the whole grain depot. The system is convenient in expansion and maintenance, far in transmission distance, simple in route selection and location, and the like; simultaneously, the system greatly reduces the construction cost and improves the working efficiency.
Description
Technical field:
The present invention relates to grain conditions in grain depot Intelligent Measurement, storage, data wireless transmission and monitoring field, is a kind of grain conditions in grain depot wireless monitor system.
Background technology:
Foodstuff preservation is the effective measures that country takes for defence war, calamity and other unexpected incidents, and grain depot grain storage monitoring technology is one of gordian technique of science guarantor grain.In early days due to reasons such as technology and funds, most of grain depot adopts the test equipment manual detection such as humidity table, the hair humidity utmost point, dual metal type meter and humidity test paper, this method wastes time and energy, efficient is low, error is large, afterwards along with the development of computer technology, each large grain depot is in succession introduced computer based grain depot network monitoring system and realized the temperature to grain depot, the detections such as concentrated timing of humidity, wherein mainly comprises following several method: (1) now raises totally digitilized silo temperature and humidity measurement and the control system of bussing technique based on Profibus; (2) based on the grain depot temperature and humidity monitoring system of CAN bus; (3) based on the grain information monitoring system of B/S structure.Although above method improvement in the past supervisory system mainly take analog signal transmission as main, accuracy of detection is lower, the drawback of poor anti jamming capability, remain wire transmission mode but communication network adopts, therefore for a large-scale grain depot, just keep away unavoidable needs and carry out through walls, punching in wiring, if circuit cloth outside, easily exposed to the weather; If imbed undergroundly, easily be corroded, and be difficult for mobile.Of long duration, these circuits will be slowly aging, needs to change, and will increase cost like this, and in a single day circuit arrange with regard to inconvenient dismounting, and mobility is poor.
for overcoming the drawback of wire transmission, the researchist detects grain conditions in grain depot and has proposed some wireless monitor new methods both at home and abroad, mainly comprise: (1) china national practical new-type patent [ZL200820058269.5] has proposed a kind of silo humiture wireless detecting system, it gathers the humiture value by the RFID label, then with the wireless rfid interrogator that sends to of measurement result, last rfid interrogator sends main frame to by photoelectric commutator or data radio station, this method had changed in the past and had been connected by wire cable between sensor and monitoring equipment, reduced the density of wiring in grain depot, relatively improve the antijamming capability of measuring equipment and sensor, but what adopt owing to communicating by letter between read write line and host computer is data radio station or photoelectric commutator, need to carry out format conversion during data transmission, the grid communication distance is short, communication speed is slow, belong to point-to-point communication, (2) utilize the GSM network that the warehouse is monitored, this system is comprised of each safety monitoring alarm terminal and the Surveillance center that are arranged in the warehouse, on the safety monitoring alarm terminal, SIM card is housed, can utilize SIM card to send to Surveillance center by the GSM network wireless data of measuring, this system is simple and convenient, stable performance, communication speed is fast, but the communication protocol between label and read write line and interface are fully different from communication protocol and interface between read write line and SIM card, and adopt the GSM network when read write line and Surveillance center's communication, need to pay the network service expense, and in the place that the GSM network base station does not cover, the blind area can appear, cause these local network poor signals, can't proper communication, (3) based on the grain condition monitoring system of wireless sensor network, this system mainly is made of numerous WSN nodes and an aggregation node of being distributed in each warehouse, its have simple in structure, the characteristics such as be easy to can communicate by letter mutually between installation, stable and reliable operation, node, but because each WSN node is to be distributed in each silo, therefore in communication, each node need to position as communicating with next node after known beaconing nodes, be inconvenient to receive the command control word of host computer, and the data-handling capacity of each node is not strong.
Summary of the invention:
The object of the present invention is to provide and a kind ofly can carry out measurement and monitoring to the temperature and humidity value of the key component in each silo in whole grain depot, greatly improved the grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network of the work efficiency of economic benefit and system.
Technical solution of the present invention is:
a kind of grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network, it is characterized in that: be useful on and gather the also interior temperature of wireless transmission silo, the sensing label of humidity information, sensing label be used for the controlled in wireless sensing label and be connected by wireless mode with the front end read write line that is connected the sensing label signal, the front end read write line be used for command control word and temperature, the relaying read write line that humidity information forwards connects by wireless mode, relaying read write line and the command control word that is used for the reception host computer and the temperature that the relaying read write line forwards, the terminal read write line of humidity information connects by wireless mode, the terminal read write line be used for to send command control word, receive and process the cereal temperature that is collected by sensing label, the upper computer control system of humidity information connects.
described sensing label is by single-chip microcomputer MSP430F149, temperature and humidity is measured chip SHT75, clock chip DS1302, storage chip AT24C02 and radio receiving transmitting module nRF905 form, the collection temperature, the detection of the information such as humidity and wireless receiving and dispatching are in one, radio receiving transmitting module is arranged on an end of an expansion link, temperature and humidity is measured the other end that chip is arranged on expansion link, at first will measure in an end insertion grain of chip with temperature and humidity during this module work, control by MSP430F149 the temperature and humidity that SHT75 measures grain in silo, measure complete by general purpose I/O port transmission to single-chip microcomputer, then single-chip microcomputer reads the interior temporal information of DS1302 also and temperature, humidity information is packed together and is processed and storage, be transferred to the front end read write line by radio receiving transmitting module nRF905 at last.
Described front end read write line mainly is comprised of single-chip microcomputer MSP430F149, storage chip AT24C02 and radio receiving transmitting module nRF905, it is installed in silo, and major function is receive the command control word of being sent by the relaying read write line and send the sensing label module to and read temperature, the humidity information that in silo, a plurality of sensing labels collect and be wirelessly sent to the relaying read write line.
Described relaying read write line mainly is comprised of single-chip microcomputer MSP430F149, storage chip AT24C02 and radio receiving transmitting module nRF905, it is installed in grain depot, play the effect of command control word and the data retransmissions such as temperature, humidity, can receive the command control word of being sent by the terminal read write line and be transmitted to the front end read write line, the information such as the temperature that simultaneously again can the receiving front-end read write line reads, humidity also is transmitted to the terminal read write line.
Described terminal read write line mainly is comprised of single-chip microcomputer MSP430F149, storage chip AT24C02 and radio receiving transmitting module nRF905, it is installed on the center of whole grain depot, be connected by serial ports with host computer, be responsible for the relaying read write line in the whole grain depot of read-write, it receives the information such as command control word that host computer is sent on the one hand, then be transmitted to respectively all relaying read write lines, read one by one again on the other hand the information such as temperature and humidity that store in all relaying read write lines.
Described upper computer control system mainly is comprised of host computer, upper computer software and audible-visual annunciator, and it is installed in Control Room.Upper computer software is developed with Delphi 7.0, this software is sent to the information storage such as temperature on host computer, humidity in database with the terminal read write line, these information comprise sensing label number information, humiture information and date temporal information, and the information such as temperature and humidity that obtain are shown and monitor in real time on the control center interface, in case find to have temperature or humidity to surpass setting value, just start immediately acoustic-optic alarm with the prompting managerial personnel.
Front end read write line and sensing label form first order RFID data transmission system, relaying read write line and front end read write line form second level RFID data transmission system, terminal read write line and relaying read write line form third level RFID data transmission system, the terminal read write line with upper between be connected by Serial Port Line.
The present invention selects suitable RFID electronic tag, the interface of design sensor and RFID label and the RFID sensing label that the grain conditions in grain depot parameter is carried out the radio tracking monitoring; Constructed suitable communication protocol the data of sensing label measurement are carried out wireless transmission, had transmission speed fast, efficient is high, the characteristics that error rate is low; The software systems of a wireless information transfer and data management have been developed.sensing label is mainly by single-chip microcomputer MSP430F149, temperature and humidity is measured chip SHT75, clock chip DS1302, storage chip AT24C02 and radio receiving transmitting module nRF905 form, after sensing label receives the measurement initiation command, at first utilizing MSP430 Single-chip Controlling SHT75 to carry out temperature and humidity measures, after measuring data, read again the date and time information in DS1302, then with tag number information, date and time information and temperature and humidity numerical value are packed together and are stored in AT24C02, and go out by the nRF905 wireless transmission according to the communication protocol of setting.What wireless transmission adopted is the integrated mode of three grades of label-read write lines, the communications such as temperature and humidity that sensing label can be collected are to host computer, first order label-read write line combination is comprised of the front end read write line of a plurality of sensing labels in each silo and Qi Nei, this moment, the front end read write line was read and write the information such as temperature and humidity value that all sensing labels in this silo collect, and stored in storer; Second level label-the relaying read write line in grain depot forms by front end read write line and frame in the read write line combination, in this level work pattern, the diversification in role of front end read write line becomes the function of sensing label, the relaying read write line is read and write all the front end read write lines in its coverage, to obtain the information such as temperature and humidity value of storing in front end read write line storer; Third level label-read write line makes up by forming by terminal read write line and the relaying read write line that serial ports is connected with host computer, in this level work pattern, the diversification in role of relaying read write line is the function of sensing label, relaying read write line in the whole grain depot of terminal read write line read-write, terminal read write line send to host computer by serial ports with data after reading the data such as temperature and humidity.Upper computer software is with the Delphi7.0 exploitation, uses the MSComm control realize the transmission of serial data and read, and utilizes SQL Server database to realize the preservation of data, in order to the inquiry and analysis use of follow-up work.this software can be monitored the information such as temperature and humidity in each warehouse in silo automatically, the information that shows not only comprises temperature and humidity information, the positional information that also comprises current date and time value and label place, the technical parameter of whole supervisory system work has: for the front end read write line, the nRF905 wireless communication module of its use, if use different frequency to carry out communication, can communicate with 125 sensing labels simultaneously, if add the communication of different addresses, can carry out communication with 232 sensing labels in theory, the communication distance of front end read write line can reach 200-300 rice, can cover whole silo fully, for relaying read write line and terminal read write line, according to actual needs, can increase the length of its emissive power and antenna, make its communication distance surpass 5000m, so just can cover whole grain depot, decide according to the number of silo in grain depot with the number of the read write line of its communication, because address size is 4 bytes, therefore be enough to satisfy actual needs.
the invention enables the staff not only can observe granary temperature and humidity information, can also observe the concrete temporal information of each temperature and humidity, whole transmitting procedure adopts wireless transmission, transmission speed is fast, efficient is high, upper computer software can dynamically show current temperature and humidity value in real time, the positional information of date time value and sensing label, and the temperature and humidity upper lower limit value of different silos number can be set, after the temperature and humidity in this silo surpasses limit value, software is transfinite particular location and the overtime information of temperature and humidity place label of prompting just, and startup acoustic-optic alarm, in time process for the staff, this software again can be a large amount of storage of history data Ps in database simultaneously, can generate chart and trend map, use for subsequent analysis, because the communication distance that is subjected to wireless radio frequency modules limits, native system can be applicable to the centralized silo, for the words of disperseing to measure between silo far away, host computer can be connected on the internet, like this silo of different regions can be by the internet with the data upload that monitors to Surveillance center, can analyze and monitor the grain conditions in grain depot of different regions.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is system's composition diagram of one embodiment of the invention.
Fig. 2 is the structured flowchart of front end read write line and sensing label.
Fig. 3 is the structured flowchart of relaying read write line and front end read write line.
Fig. 4 is the structured flowchart of terminal read write line and relaying read write line.
Fig. 5 is that host computer sends the order process flow diagram.
Fig. 6 is that data flowchart is measured and transmitted to sensing label.
Embodiment:
A kind of grain conditions in grain depot wireless monitoring method and system based on the multistage RFID reader-writer network structure comprise three grades of rfid interrogators-set of tags web frame, and the first order is comprised of front end read write line and sensing label; The second level is comprised of relaying read write line and front end read write line; The third level is comprised of terminal read write line and relaying read write line.be useful on and gather and the interior temperature of wireless transmission silo, the sensing label 1 of humidity information, sensing label be used for the controlled in wireless sensing label and be connected by wireless mode with the front end read write line 2 that is connected the sensing label signal, front end read write line 2 be used for command control word and temperature, the relaying read write line 3 that humidity information forwards connects by wireless mode, relaying read write line 3 and the command control word that is used for the reception host computer and the temperature that the relaying read write line forwards, the terminal read write line 4 of humidity information connects by wireless mode, terminal read write line 4 be used for sending command control word, receive and process the cereal temperature that is collected by sensing label, the upper computer control system of humidity information connects.
described sensing label 1 is by single-chip microcomputer (MSP430F149) 7, temperature and humidity is measured chip (SHT75) 8, clock chip (DS1302) 9, storage chip (AT24C02) 10 and radio receiving transmitting module (nRF905) 11 form, the collection temperature, the detection of the information such as humidity and wireless receiving and dispatching are in one, radio receiving transmitting module is arranged on an end of an expansion link, temperature and humidity is measured the other end that chip is arranged on expansion link, at first will measure in an end insertion grain of chip with temperature and humidity during this module work, control by MSP430F149 the temperature and humidity that SHT75 measures grain in silo, measure complete by general purpose I/O port transmission to single-chip microcomputer, then single-chip microcomputer reads the interior temporal information of DS1302 also and temperature, humidity information is packed together and is processed and storage, be transferred to the front end read write line by radio receiving transmitting module nRF905 at last.
Described front end read write line 2 mainly is comprised of single-chip microcomputer (MSP430F149) 12, storage chip (AT24C02) 13 and radio receiving transmitting module (nRF905) 14, it is installed in silo 15, and major function is receive the command control word of being sent by the relaying read write line and send the sensing label module to and read temperature, the humidity information that in silo, a plurality of sensing labels collect and be wirelessly sent to the relaying read write line.
Described relaying read write line 3 mainly is comprised of single-chip microcomputer (MSP430F149) 16, storage chip (AT24C02) 17 and radio receiving transmitting module (nRF905) 18, it is installed in grain depot, play the effect of command control word and the data retransmissions such as temperature, humidity, can receive the command control word of being sent by the terminal read write line and be transmitted to the front end read write line, the information such as the temperature that can read from the front end read write line again simultaneously, humidity also is transmitted to the terminal read write line.
Described terminal read write line 4 mainly is comprised of single-chip microcomputer (MSP430F149) 19, storage chip (AT24C02) 20 and radio receiving transmitting module (nRF905) 21, it is installed on the center of whole grain depot, be connected by serial ports with host computer, be responsible for the relaying read write line in the whole grain depot of read-write, it receives the information such as command control word that host computer is sent on the one hand, then be transmitted to respectively all relaying read write lines, read one by one again on the other hand the information such as temperature and humidity that store in all relaying read write lines.
Described upper computer control system mainly is comprised of host computer 5, upper computer software and audible-visual annunciator 6, and it is installed in Control Room.Upper computer software is developed with Delphi 7.0, this software is sent to the information storage such as temperature on host computer, humidity in database with the terminal read write line, these information comprise sensing label number information, humiture information and date temporal information, and the information such as temperature and humidity that obtain are shown and monitor in real time on the control center interface, in case find to have temperature or humidity to surpass setting value, just start immediately acoustic-optic alarm with the prompting managerial personnel.
Front end read write line and sensing label form first order RFID data transmission system, relaying read write line and front end read write line form second level RFID data transmission system, terminal read write line and relaying read write line form third level RFID data transmission system, the terminal read write line with upper between be connected by serial ports 22.
as shown in Figure 1, be divided into three level work structures during whole system work, first order work structuring be the front end read write line with silo in sensing label between communicate by letter, its structured flowchart as shown in Figure 2, this layer mainly comprises sensing label and front end read write line, in the course of work of reality, the task of front end read write line is that the measurement that receives from the relaying read write line begins or ceases and desist order, control the read-write operation and the measurement result that receives from sensing label of all sensing labels in silo, the task of sensing label is that the measurement that receives from the front end read write line begins or ceases and desist order, start-up temperature and humidity sensor are measured, read the date time value in clock chip and these data packings are sent to the front end read write line, the task of front end read write line is equivalent to a transponder, the order that reads from the relaying read write line is transmitted to sensing label, then will be transmitted to from the measurement result that sensing label reads the relaying read write line again, second level work structuring be the relaying read write line with the front end read write line between communicate by letter, its structured flowchart as shown in Figure 3, from then on can see in structure, it comprises relaying read write line and front end read write line, in the work of reality, the main function of relaying read write line is forward command and data, and it will be transmitted to from the order that the terminal read write line receives the front end read write line on the one hand, will be transmitted to from the measurement result that the front end read write line is read the terminal read write line again on the other hand, third level work structuring be the terminal read write line with the relaying read write line between communicate by letter, its structured flowchart as shown in Figure 4, wherein the terminal read write line is connected with host computer by serial ports, be used for to receive the order of host computer and is transmitted to the relaying read write line and reads the information such as measurement result from the relaying read write line and send host computer to.Between every level work structure, lap is arranged also, play the effect of read write line in first order work structuring as the front end read write line, but the function that is equivalent to sensing label in the work structuring of the second level, the relaying read write line is equivalent to the read write line function in the work structuring of the second level, but is equivalent to the effect of sensing label in third level work structuring.For realizing accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 and the described structure of accompanying drawing 4 and function, the system software program flow process as shown in Figure 5 and Figure 6.
Read write line and label model frequency of operation are the open ISM band of 433MHz or 915MHz, and the distance of transmission surpasses 200 meters, and except terminal read write line and host computer employing wire communication, all the other all adopt wireless telecommunications.whole system is in real work, at first each silo temperature and humidity value that transfinites is set, then only needing to click beginning on the host computer interface, to measure button just passable, this moment, host computer sent hexadecimal data " 01 " to the terminal read write line, if but want to stop to measure, need to click and stop measuring button on the host computer interface, this moment, host computer can send hexadecimal data " 00 " to the terminal read write line, after receiving orders, the terminal read write line will send step by step this order to sensing label, sensing label will judge the order of receiving, if " 01 " just begins to measure, if " 00 " just stops measuring.After measurement is completed, need to send the result of measuring to the front end read write line, according to actual needs, measurement result and tag number and date temporal information are packed, packet after packing always has 32 bytes, its form is as shown in table 1, and the system communication instruction definition is as shown in table 2, and the RFID communications protocol is as shown in table 3.
The definition of table 1 data packet format
Table 2 system communication instruction definition
Table 3RFID communications protocol
The implication of communication instruction and communications protocol is described below by an example:
if want to measure the temperature and humidity value, host computer sends decimal number " 01 " to the terminal read write line, then the terminal read write line hands down this order step by step, until send all sensing labels to, after sensing label receives this order, just begin to measure the temperature and humidity value, after completing, measurement just returns to the front end read write line, the front end read write line returns to host computer with measurement result more step by step, owing to containing label position information (silo number and tag number) and date temporal information in packet, so, in upper computer software, be easy to just know the when and where that each humiture value occurs.Such as, if receive certain data packet format be: 0203100718024503025.0120069.0415, after host computer receives these data, through after separation as can be known its information to be expressed be: the temperature that No. 03 label recorded on July 18th, 2010 in 02 o'clock in 45 minutes in 03 second in No. 02 warehouse is 25.012 degree, and humidity is 69.0415%RH.
When needs stopped measuring, host computer sent decimal number " 00 " to the terminal read write line, and the terminal read write line until sensing label receives this order, then stops all measurement operations again by this order is transmitted.
In PC control software, the value that transfinites set in the temperature and humidity value in each the group packet that receives and corresponding silo is compared, whether check that over the temperature and humidity value of restriction, if surpass, host computer will start audible-visual annunciator.
Claims (5)
1. grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network, it is characterized in that: be useful on and gather the also interior temperature of wireless transmission silo, the sensing label of humidity information, sensing label be used for the controlled in wireless sensing label and be connected by wireless mode with the front end read write line that is connected the sensing label signal, the front end read write line be used for command control word and temperature, the relaying read write line that humidity information forwards connects by wireless mode, relaying read write line and the command control word that is used for the reception host computer and the temperature that the relaying read write line forwards, the terminal read write line of humidity information connects by wireless mode, the terminal read write line be used for to send command control word, receive and process the cereal temperature that is collected by sensing label, the upper computer control system of humidity information connects,
Described sensing label is measured chip SHT75, clock chip DS1302, storage chip AT24C02 and radio receiving transmitting module nRF905 by single-chip microcomputer MSP430F149, temperature and humidity and is formed, temperature and humidity is measured chip and is connected with single-chip microcomputer by the I/O port, single-chip microcomputer is connected with clock chip and storage chip, single-chip microcomputer with the radio receiving transmitting module of communication to the front end read write line is connected; Radio receiving transmitting module is arranged on an end of an expansion link, temperature and humidity is measured the other end that chip is arranged on expansion link, at first will measure in an end insertion grain of chip with temperature and humidity during this module work, control by MSP430F149 the temperature and humidity that SHT75 measures grain in silo, measure complete by general purpose I/O port transmission to single-chip microcomputer, then single-chip microcomputer read in DS1302 temporal information and and temperature, humidity information pack together and process and store, be transferred to the front end read write line by radio receiving transmitting module nRF905 at last;
be divided into three level work structures during whole system work, first order work structuring be the front end read write line with silo in sensing label between communicate by letter, this layer mainly comprises sensing label and front end read write line, in the course of work of reality, the task of front end read write line is that the measurement that receives from the relaying read write line begins or ceases and desist order, control the read-write operation and the measurement result that receives from sensing label of all sensing labels in silo, the task of sensing label is that the measurement that receives from the front end read write line begins or ceases and desist order, start-up temperature and humidity sensor are measured, read the date time value in clock chip and these data packings are sent to the front end read write line, the task of front end read write line is equivalent to a transponder, the order that reads from the relaying read write line is transmitted to sensing label, then will be transmitted to from the measurement result that sensing label reads the relaying read write line again, second level work structuring be the relaying read write line with the front end read write line between communicate by letter, in the work of reality, the main function of relaying read write line is forward command and data, it will be transmitted to from the order that the terminal read write line receives the front end read write line on the one hand, will be transmitted to from the measurement result that the front end read write line is read the terminal read write line again on the other hand, third level work structuring be the terminal read write line with the relaying read write line between communicate by letter, be used for receiving the order of host computer and be transmitted to the relaying read write line and read the information such as measurement result from the relaying read write line and send host computer to, between every level work structure, lap is arranged also,
read write line and label model frequency of operation are the open ISM band of 433MHz or 915MHz, and the distance of transmission surpasses 200 meters, and except terminal read write line and host computer employing wire communication, all the other all adopt wireless telecommunications, whole system is in real work, at first each silo temperature and humidity value that transfinites is set, then only needing to click beginning on the host computer interface, to measure button just passable, this moment, host computer sent hexadecimal data " 01 " to the terminal read write line, if but want to stop to measure, need to click and stop measuring button on the host computer interface, this moment, host computer can send hexadecimal data " 00 " to the terminal read write line, after receiving orders, the terminal read write line will send step by step this order to sensing label, sensing label will judge the order of receiving, if " 01 " just begins to measure, if " 00 " just stops measuring, after measurement is completed, need to send the result of measuring to the front end read write line, according to actual needs, measurement result and tag number and date temporal information to be packed, the packet after packing always has 32 bytes.
2. the grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network according to claim 1, it is characterized in that: described front end read write line comprises single-chip microcomputer, single-chip microcomputer is connected with storage chip and radio receiving transmitting module; The front end read write line is installed in silo.
3. the grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network according to claim 1, it is characterized in that: described relaying read write line comprises single-chip microcomputer, single-chip microcomputer is connected with storage chip and radio receiving transmitting module.
4. the grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network according to claim 1, it is characterized in that: described terminal read write line comprises single-chip microcomputer, single-chip microcomputer is connected with storage chip and radio receiving transmitting module, the terminal read write line is installed on the center of whole grain depot, is connected by serial ports with host computer.
5. the grain conditions in grain depot wireless monitor system based on multistage RFID reader-writer network according to claim 1, it is characterized in that: described upper computer control system comprises host computer, host computer is connected with audible-visual annunciator, and upper computer control system is installed in Control Room.
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| CN102393772B (en) * | 2011-08-26 | 2013-12-11 | 童红雷 | Temperature and humidity monitoring system for warehouse management |
| CN103198635A (en) * | 2013-02-01 | 2013-07-10 | 内蒙古自治区科学技术信息研究所 | Wireless transmission system for realizing data acquisition |
| CN103364109B (en) * | 2013-07-19 | 2015-04-15 | 深圳市粮食集团有限公司 | Temperature collection system and method used for collecting temperature of grains |
| US10303134B2 (en) * | 2015-04-10 | 2019-05-28 | Fisher Controls International Llc | Methods and apparatus for multimode RFST communications in process control systems |
| CN104777815B (en) * | 2015-04-16 | 2017-10-13 | 成都柏森松传感技术有限公司 | A kind of galvanized wire for suspension bridge safety comprehensive monitoring system and monitoring method |
| CN107357195A (en) * | 2017-06-15 | 2017-11-17 | 江南大学 | A kind of low-power consumption grain feelings measuring system based on STM32 |
| CN109850149A (en) * | 2019-01-15 | 2019-06-07 | 南京财经大学 | A kind of grain depot inspection system based on unmanned flight's device technique |
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| CN1302381A (en) * | 1999-03-30 | 2001-07-04 | 密克罗奇普技术公司 | Radio frequency identification tag device with sensor input |
| CN101087218A (en) * | 2006-06-07 | 2007-12-12 | 中国科学院电子学研究所 | Grain information monitoring system based on wireless sensor network |
| CN200997636Y (en) * | 2006-09-29 | 2007-12-26 | 叶大军 | Intelligent wireless monitor-controlling system of granary |
| CN201215494Y (en) * | 2008-05-09 | 2009-04-01 | 上海良友（集团）有限公司 | Wireless detection system for temperature and humidity of granary |
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