CN102486389A - Grain bin temperature and humidity measuring device of wireless sensor network - Google Patents

Grain bin temperature and humidity measuring device of wireless sensor network Download PDF

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Publication number
CN102486389A
CN102486389A CN2010105729147A CN201010572914A CN102486389A CN 102486389 A CN102486389 A CN 102486389A CN 2010105729147 A CN2010105729147 A CN 2010105729147A CN 201010572914 A CN201010572914 A CN 201010572914A CN 102486389 A CN102486389 A CN 102486389A
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microprocessor
circuit
interface
data
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于洋
田玉林
袁明波
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Shenyang Ligong University
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Shenyang Ligong University
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Abstract

The invention relates to a grain bin temperature and humidity measuring device of a wireless sensor network. The grain bin temperature and humidity measuring device comprises a wireless sensor node system and a concentrator system, wherein the concentrator system is connected with an upper computer, the wireless sensor node system collects temperature and humidity information and then sends the temperature and humidity information to the concentrator system through a radio-frequency circuit, the concentrator system receives the information through the radio-frequency circuit, and stores the information on the periphery of a memory; and the concentrator system and the upper computer carries out transmission through an RS232 serial communication mode, and after the temperature and humidity information is transferred to the upper computer, a series of functions such as storage, data processing, display, warning and the like can be realized through software. The system reconfigurability is strong, the cost is low, the damage of a single node does not influence the transmission and acquisition of the entire network, and an autoalarm function is achieved; and the wireless sensor network which is accurate in monitoring and is flexible and convenient can be used for carrying out temperature and humidity monitoring on a grain bin.

Description

A kind of grain depot thermometric of wireless sensor network, wet device
Technical field
What this patent related to is grain depot thermometric, wet device, is based on grain depot wireless temperature measurement, wet device that single-chip microcomputer and wireless radio-frequency have designed a kind of wireless penetration, intellectuality, networking, low-power consumption specifically.
Background technology
The pen bank is the elementary cell of grain storage, the big and dispersion of reservoir area area.In order to guarantee the safety of grain in storage, grain depot grain condition monitoring system is absolutely necessary.Along with the progress and the development of electronic technology, Computer Applied Technology, mechanics of communication and network technology, new and high technology has been applied to the grain depot monitoring system, and the grain depot monitoring technology is one of gordian technique of science guarantor grain.For many years, under grain department and scientific and technical personnel's cooperation energetically, the grain condition monitoring technology constantly improves, improves and tends to ripe, has progressively formed the various grain condition monitoring system of pattern, stores up grain for safety, science and has played positive effect.
At present; The particularly middle-size and small-size grain depot of domestic grain depot is in warehousing management because on technology and the fund, and majority only limits to only temperature, humidity carried out artificial field monitoring, relies on manual work to measure; Efficient is low; Poor accuracy can not in time be found dangerous situation and carry out handled, thereby cause a large amount of losses when temperature exceeding standard.Therefore; Research and development have been extremely urgent towards the grain condition monitoring and the management system of medium and small grain depot, and the medium and small grain depot grain condition monitoring and the management system that on the basis of this grain depot wireless temperature measurement, wet device, realize can solve the current problem that faces of medium and small grain depot well.
What the most of grain depot of China adopted traditionally is wired thermometric, wet, adopts cable to carry out data between each parts and transmits, and this thermometric, wet device line are many, and wiring is complicated, difficult in maintenance.Be subject to be used for the corrosion of the stifling phosphine gas of grain, cause a large amount of thermometric device paralysis, therefore increased the carrying cost of grain.And the temperature measuring device that many grain storage units adopt is made a copy of, is managed the classic method that combines not only efficient is low with artificial, and often since error in judgement happen occasionally with ineffective part or the large-scale grain mildew phenomena of causing of management.
Wireless sensor node constitutes a kind ofly has dynamic routing node arbitrarily to place transplantability good; System's reconfigurability is strong; Cost is low; Single node damages does not influence whole Network Transmission collection, accurately the wireless sensor network that grain depot is carried out temperature, humidity control of monitoring and flexible characteristics.Thoroughly break away from conventional artificial and made a copy of method, made up grain feelings data analysis decision-making master system and detect temperature, humidity in the silo in real time, guaranteed temperature suitable in the silo, humidity environment.
Along with the fast development of science and technology, the development trend of grain depot thermometric, wet device must be to develop to wireless penetration, intellectuality and networked direction, and artificial grain depot temperature, humidity method and the traditional way to manage thereof surveyed will be abandoned.
Summary of the invention
The objective of the invention is to exist the problem of many discomforts to the artificial field monitoring of present middle-size and small-size grain depot; Very be applicable to middle-size and small-size grain depot and provide, can realize automatic temperature measurement, wet and a kind of grain depot wireless temperature measurement of host computer data presentation and management, wet system based on wireless network.
Addressing the above problem the technical scheme of being taked is:
A kind of grain depot wireless temperature measurement based on wireless network, wet system, comprising: wireless sensor node system, concentrator system, wherein the concentrator system links to each other with host computer.As shown in Figure 1, said wireless sensor node system sends to the concentrator system through radio circuit after gathering temperature, humidity information, after the concentrator system receives information via radio circuit, can on its peripheral storage, store; Concentrator system and host computer are through the transmission of RS232 serial communication mode, and temperature, humidity information are sent to after the host computer, can be realized a series of functions such as storage, data processing, demonstration, warning by software.
Above-mentioned wireless sensor node system is as shown in Figure 2, comprises low power consumption digital sensor SHT11, wireless sensor node microprocessor MSP430, radio circuit CC1100, debugging interface (JTAG), storer AT45DB041, power-supply system etc.Wherein each peripheral circuit of processor MSP430 and all the other links to each other; Power-supply system links to each other with the each several part circuit, and native system adopts No. 5 alkaline batteries of 2 joints as power supply, and power-supply system is made up of power supply unit and dynamic power management unit, and the dynamic power management unit is provided with the node voltage observation circuit.Sensor SHT11 links to each other with microprocessor MSP430 with clock line through data line; JTAG links to each other with microprocessor MSP430 through signal wire; Each interface of storer AT45DB041 links to each other with the universaling I/O port of microprocessor MSP430; Each interface of radio circuit CC1100 links to each other with microprocessor MSP430 universaling I/O port through 4 line spi bus, and power-supply system links to each other with each device VCC interface respectively and supplies power and be provided with electric voltage observation circuit.
Above-mentioned concentrator system is as shown in Figure 3, comprises several parts such as radio circuit CC1100, microprocessor STC89LE58RD+, reset circuit, key circuit, liquid crystal display circuit, memory circuit, serial communication circuit.Wherein each peripheral circuit of processor STC89LE58RD+ and all the other links to each other; Radio circuit CC1100 links to each other with the universaling I/O port of microprocessor STC89LE58RD+ through 4 line spi bus; The chip MAX810R that resets links to each other with the reseting interface of microprocessor STC89LE58RD+; Key circuit links to each other respectively with interrupt interface, general-purpose interface, the timer interface of microprocessor STC89LE58RD+; Liquid crystal display circuit OCMJ4X8C directly links to each other with microprocessor STC89LE58RD+; Memory circuit links to each other with the general-purpose interface of STC89LE58RD+, and serial communication circuit links to each other with serial input, output terminal RXD, the TXD of STC89LE58RD+.Above-mentioned memory circuit is as shown in Figure 4; The storer HK1255-7 that comprises latch 74HC573 and concentrator; The control bit interface of latch 74HC573 links to each other with the universaling I/O port of STC89LE58RD+, and storer HK1255-7 links to each other with the corresponding interface of latch 74HC573; Above-mentioned serial communication circuit is as shown in Figure 5, and RS232 links to each other with serial input, output terminal RXD, the TXD of STC89LE58RD+, and RS232 links to each other with serial input, output terminal PC RXD, the PC TXD of host computer through Serial Port Line simultaneously.
Principle of work of the present invention and running program:
This monitoring system utilizes wireless sensor network technology to constitute a grain condition monitoring system that collects grain condition monitoring, monitoring humiture analysis and grain temperature controlling alarm for one.The block diagram of system is as shown in Figure 1.Total system is made up of a host computer, a concentrator (Sink) and a large amount of powerful sensor temperature measurement nodes etc.Host computer (PC) and concentrator are placed on the grain condition monitoring center of grain depot, and their close connect with RS232.Concentrator is connected the transmission data through communication with the temperature measurement node of each silo.
Cluster structured similar according to the thermometric structure of grain depot and wireless sensor network, a plurality of silos of grain depot closely are arranged in together, and a plurality of temperature measurement nodes are arranged in each silo, so we adopt the cluster structured grain condition monitoring that carries out to grain depot here.The sub-clustering route technology is the cutting edge technology of current wireless network sensor technology, implements through the increase wireless communication module.Wireless sensor node among the present invention can be divided into leader cluster node and bunch interior nodes, in cluster structured, each silo is divided into one bunch, and each bunch is made up of temperature measurement node in a leader cluster node and a plurality of bunches.Bunch interior nodes in each storehouse sends data to leader cluster node through the single-hop routing mechanism; Bunch capitiform in each storehouse has become higher leveled network, between bunch head, transmits data, is transmitted to concentrator through multi-hop, is being uploaded to PC by concentrator, to realize grain condition monitoring.Member node is responsible for image data in bunch; Then with the data that collect send under it bunch bunch head; By leader cluster node to bunch in the data that send of member handle, the data after bunch first processing send grain condition monitoring center or remote monitoring center to through a bunch network then.
The wireless sensor node synoptic diagram of this patent is as shown in Figure 2, and wherein leader cluster node and bunch interior nodes all have identical construction, all are made up of Temperature Humidity Sensor, microprocessor, radio circuit, debugging and download interface, storer, power-supply system etc.
Processor unit is the core of sensor network nodes and collection, processing and the transmitting-receiving that other unit are accomplished data together.Because node adopts powered battery, so power problems seems most important, and wireless sensor node is exactly the microcontroller that adopts MSP430 series, and power consumption is very low, comprehensive more several kinds of single-chip microcomputers, and this patent has been selected the MSP430F169 single-chip microcomputer of TI company for use.
Temperature Humidity Sensor SHT11 can support low-power consumption mode; Temperature Humidity Sensor and microprocessor communication adopt serial two line interface SCK and DATA, and wherein SCK is a clock line, and DATA is a data line; Order in order to the transmission microprocessor makes the sensor acquisition data and uploads.The humidity value output resolution ratio is 14, and the temperature value output resolution ratio is 12, and is programmed for 12 and 8.In order to measure the temperature and humidity value of the temperature measurement node in the storehouse more accurately, SHT11 can measure Monitoring Data more accurately through the linear compensation of humiture, changes park mode automatically over to after having gathered data.
Radio frequency chip CC1100 is the UHF transceiver of a low-cost monolithic of Chipcon company release; Aiming at low-consumption wireless uses and designs; The work characteristics of CC1100 is to produce lead code automatically and CRC can be easy to carry out programmed configurations through the SPI interface, and current drain is low.CC1100 has 20 pins, wherein has the I/O mouth of 6 pins and single-chip microcomputer to link to each other.CC1100 realizes the MSP430F169 single chip communication through 4 line spi bus interfaces (SI, SO, SCLK and CSn).All operations all comprises a read/write on the SPI interface, a byte of a burst access position and one 6 bit address.Wherein, the SCLK pin is the serial clock interface; The SO pin is the serial output interface; The CSN pin is that series arrangement is selected pin; The SI pin is the serial input interface.It is operated in SPI from pattern, this pattern simultaneously as write data cached.
The storage chip AT45DB041 of node is the serial FLASH chip of the novel 512KB of atmel corp, and external circuit is simple, and volume is little, and is low in energy consumption, is fit to the sensor node design.AT45DB041B is when writing with read operation, and sheet selects pin CS and one input SI continuously, and the three-way access interface of exporting SO and continuous clock SCK composition continuously makes the AT45DB041 operate as normal.All cycles of writing all are self synchronous, thereby before writing, all need not erase cycle separately.The AT45DB041 peripheral circuit is very simple, can be connected with microcontroller easily.SO, SI, SCK ,/CS ,/WP links to each other with the general purpose I/O of microprocessor respectively and gets final product.
JTAG (Joint Test Action Group combined testing action group) is a kind of international standard test protocol; Be mainly used in the chip internal test and system is carried out emulation, debugging, the ultimate principle of JTAG is at a device inside definition TAP (Test Access Port) test access mouth) test carrying out internal node through the jtag test instrument of special use.The chip of JTAG mouth all has following JTAG pinout:
TCK---test clock input;
TDI---test data input, data are through TDI input JTAG mouth;
TDO---test data output, data are exported from the JTAG mouth through TDO;
TMS---test pattern is selected, and TMS is used for being provided with the JTAG mouth and is in certain specific test pattern.
Selectable pin TRST---test reset, input pin, low level is effective.
Electric energy is the precious resource of sensor network, and in a single day the node electric energy exhausts, and announces that promptly its life-span expires and will exit network.The WV that is used devices such as microprocessor system, peripheral circuit, CC1100 wireless module all is operated in 3V, so native system adopts No. 5 alkaline batteries of 2 joints as power supply.And along with the operation of total system, cell voltage can descend thereupon lentamente, so need when supply voltage drops to the critical value of system works, CPU can in time detect and in time react.This just needs sensor node that a more effective battery electric quantity monitoring means is arranged, and the electric voltage observation circuit of the Mica2 node of employing University of California Berkeley development is monitored the supply situation of power supply in this patent.The minimum 2.4V that can reach of WV of devices such as SCM system, CC1100 wireless module, but can not be low excessively, and in view of this reason, then should select warning value for use is the voltage monitoring chip of 2.6V.
The concentrator system schematic of this patent is as shown in Figure 3, and concentrator is responsible for accepting the Monitoring Data of bunch overhead pass and Monitoring Data is stored, and then Monitoring Data is passed to host computer through serial ports.Comprise several parts such as radio circuit CC1100, microprocessor STC89LE58RD+, reset circuit, key circuit, liquid crystal display circuit, memory circuit, serial communication circuit.
Since concentrator do not require low-power consumption, and in order to guarantee safety of data, we adopt encryption is high, superpower antijamming capability the is strong STC89LE58RD+ single-chip microcomputer microprocessor as concentrator.Maximum clock frequency 0~the 80MHz of STC89LE58RD+ single-chip microcomputer, optional " 6 clocks/machine cycle " and " 12 clocks/machine cycle " double frequency function let it possess very high processing speed.It has the Flash storer of 32K, of 16K byte etc., and resource is very abundant in its sheet.The interface of the serial interface of introducing above in the STC89LE58RD+ SCM peripheral interface circuit there being each interface, the interface of CC1100, HK1255 storer, the interface of liquid crystal and keystroke interface etc.
The radio circuit CC1100 of concentrator introduced at sensor node structure place; Repeat no more; Unique difference is the difference of function: the only responsible transmission information of radio circuit is to a bunch node in bunch interior nodes in the sensor node, and a bunch node not only is responsible for reception information but also be responsible for transmission information; And the radio circuit of concentrator only is responsible for reception information.
Reset circuit resets, and to adopt MAX810R, MAX810R be a kind of microprocessor of simple function chip that resets to chip, is used to monitor the supply voltage of microcontroller and other flogic systems.It can power on, and to microcontroller reset signal is provided under power down and the economize on electricity situation.When supply voltage was lower than preset threshold voltage, device can send reset signal, up to supply voltage in a period of time return to again be higher than threshold voltage till.
Key circuit directly links to each other with the microprocessor STC89LE58RD+ of concentrator, and button is by the next low level signal that provides, and its major function is to realize that interruption, program detect, LCD data presentation calling program, functions such as choice menus subroutine.
Liquid crystal display circuit adopts this liquid crystal of OCMJ4X8C directly to link to each other with microprocessor, can accept serial or parallel data.Built-in 2M position Chinese font ROM (CGROM) provides 8192 Chinese fonts altogether.In order to save pin; So the design adopts serial mode transmission data, wherein diode is the triode that light on and off are controlled for backlight; The PSB pin is the control end that serial ports is selected; The LED_BACK pin is the light on and off that single-chip microcomputer is used for controlling the LCD backlight lamp; RS (CS) is that liquid crystal is selected the serial ports transmission mode or the control bit of parallel port transmission mode; R/W (SID) is a liquid crystal display data transmission mouth, and it is through the clock signal transmission data of E (SCLK); DB0-DB7 is that the data transmission data transmission mouth of parallel port is not used here.
Concentrator is the final slave computer memory device of Monitoring Data, and the safety storing of Monitoring Data and quick storage have directly influenced the normal operation of whole grain condition monitoring system.For the storage that guarantees that Monitoring Data can be quick, safe, again because storer to write cycle index unrestricted, so we adopt the storer of this nonvolatile memory HK1255-7 as concentrator.HK1255-7 has one to carry lithium power supply and control circuit, often keeps watch on Vcc and whether surpasses admissible condition.When surpassing admissible condition, the lithium power supply is connected automatically, and unconditional startup of write-protect obscured data with protection.In addition, HK1255-7 is the protection piece of memory write unconditionally, so inadvertent write operation can interference program and special data space.74HC573 is used for latching the address of HK1255 storer and the latch of data.When single-chip microcomputer is read states, will see the address latch that comes off to the address bit of HK1255 through the set of control bit CS573A, CS573B, CS573C, when HK1255 /CSSRAM is during with/RD set, reads the data of this address of HK1255 output.The data of microprocessor and address are perhaps to microprocessor input HK1255 data and address.When single-chip microcomputer when writing state; To see next address latch off to the address bit of HK1255 through the set of control bit CS573A, CS573B, CS573C; When HK1255 /CSSRAM is during with/WE set, reads the data of single-chip microcomputer output, HK1255 saves the data in this address.Here D0-D7 is a data bit, and A0-A18 is the address bit of HK1255, and/RD is the read states position, and/WE writes mode bit.
Serial communication circuit adopts the RS232 transmission mode, utilizes the serial ports of concentrator that the Monitoring Data that collects is uploaded to host computer, and host computer is also given concentrator through the serial ports transmitting order to lower levels.We have defined the transmission control command in transmission frame, adopt acknowledgement mechanism to guarantee to transmit accurately and reliably data.PC_TXD is transmitting terminal and the receiving terminal that is connected with PC with PC_TXD, and TXD and TXD are the transmitting terminal and the receiving terminals of the serial ports that is connected with concentrator.
Operation steps:
1, at the hardware of native system on request after the successful connection, just needing to start software could operate as normal and bring into play its function; After system powered on, system was begun by the initialization of master routine automatically, got into the program major cycle.
Wireless sensor node, the The software adopted modularized design method of temperature measurement node in the storehouse.Software is made up of master routine and interrupt service subroutine.Master routine comprises initialize routine and watchdog routine; Interrupt service subroutine comprises Interrupt Process subroutine, wireless data transceiving subroutine, data acquisition subroutine, bunch agreement subroutine, low-power consumption subroutine etc.Because system software adopts modular design, thereby master routine only is responsible for calling each functional module program.After system powers on; Master routine is begun by the initialization of system; The major cycle of entering program, judge whether add network successively, whether battery under-voltage, whether receive wireless data, whether issue this address, etc. operation, treat these and judge timing acquiring and the transmission of carrying out data after finishing again; Get into the sleep low-power consumption mode at last, wait for and interrupt " waking up " single-chip microcomputer.
For putting together, before maim body is carried out, must design, otherwise procedure subject can not normally carry out original state, also can not get correct result.The initialization of native system program comprises the content of following aspect: the definition of CPU register, state and control register; The initialization of employed storage unit comprises RAM data initialization and nonvolatile random access memory (HK1255-7) data initialization; The initial configuration of each control register of CC1100 etc.; The setting of port controling register is like the initialization of I/O mouth, liquid crystal control mouthful initialization etc.It is to be noted not to be that the control/mode register and the work register of all single-chip microcomputers all need carry out initialization, general only the need carried out initialization to the register of participating in work.Because the grain condition monitoring system software adopts modular design, thereby the temperature measurement node master routine only is responsible for calling each functional module program.Master routine is begun by the initialization of system; The major cycle of entering program; Judge successively whether whether be this machine address, the data of whether receiving leader cluster node, data accept correctly, whether exist interruption, button whether by inferior operation; Treat to carry out liquid crystal display again after these judge end, wait for that Interrupt Process finishes.
2, system power on carry out initialization and self check and accomplish after, just can carry out measurement data and data transmission.Main frame sends and starts the SHT11 order, through the initialization of data transmission, and the main frame thermometric order of redispatching, SHT11 just begins measurement data.When CC1100 was in sleep pattern, the targeting signal in the antenna real time monitoring wireless network in case confirm synchronizing signal, meaned that then this machine obtains synchronously with the node that sends data, wakes CC1100 with that up and begins to receive valid data.Then begin to judge address byte; If address byte is this machine address; Then judge whether it is which type of order, in case confirm that MCU just begins to utilize routing algorithm to carry out the analysis in path; Send answer signal to control center, with just sending data after the packing data through a day alignment wireless network.Whole operation finishes back CC1100 and continues sleep.It is to be noted; CC1100 is in the not all function of sleep pattern and closes; Because WOR must be set to opening, electromagnetic wave activates (WOR) function can activate CC1100 periodically from deep sleep state, does not need the effect of MCU also can detect the packet of arrival; Could guarantee the aerial information frame of monitoring in real time like this, guarantee effective operation of whole network.
3, after leader cluster node was selected, this leader cluster node was broadcasted all nodes in the network, and broadcast data comprises the information that this node becomes leader cluster node.Non-leader cluster node is then opened their receiver all the time, monitors the broadcast data packet of accepting all leader cluster nodes.In case a non-bunch of sensor node receives all broadcast data packet; According to each leader cluster node broadcast signal strength that receives; Each non-bunch of sensor node adds according to the maximum leader cluster node of the RSSI function selecting intensity of CC1100, and becomes its member's packet to its transmission.
4, bunch capitiform in each storehouse has become higher leveled network, between bunch head, transmits data, changes routing mechanism through multi-hop and issues concentrator, is being uploaded to PC by concentrator, to realize grain condition monitoring.
5, grain condition monitoring center or staff are through can carry out the inquiry and the display operation of temperature measurement node in certain storehouse easily to the use of button.When showing that request is interrupted, master routine response interruption also shows relevant information; LCD mainly shows in prevariety Monitoring Data mean value, bunch No.1, the information such as node number that bunch interior nodes electric weight is lower than voltage threshold uploading and do not upload.After these demonstration tasks were accomplished, LCD can close to reduce power consumption within a certain period of time.
6, visible by top design, node exists many incidents that need Interrupt Process at operational process, guarantee normally operation in an orderly manner of total system, must arranging according to the priority of these interrupt events.Total system must must transmit the superlative degree as all interrupt events with the Monitoring Data in the wireless network with effective operation starting point of monitoring network.And for the operations such as data processing of individual node self and do not influence the valid function of total system, priority that can node self operation is set to low priority.In case antenna detects the information frame in the network; After confirming synchronizing signal; No matter node is in sleep or other active states, must interrupt, and the wireless data of handling this machine according to priority transmits or operation such as relaying forwarding; Return mode of operation before etc. after the radio communication end, only in this way could guarantee that whole monitoring network is in the state of orderly function.
The advantage of this patent:
1, adopt wireless temperature measurement, the wet monitoring that realizes the grain feelings, what the most of grain depot of China adopted traditionally is wired thermometric, adopts cable to carry out data between each parts and transmits, and this temperature measuring equipment circuit is many, and wiring is complicated, difficult in maintenance.Be subject to be used for the corrosion of the stifling phosphine gas of grain, cause a large amount of thermometric device paralysis, therefore increased the carrying cost of grain.And the temperature measuring device that many grain storage units adopt is made a copy of, is managed the classic method that combines not only efficient is low with artificial, and often since error in judgement happen occasionally with ineffective part or the large-scale grain mildew phenomena of causing of management.Wireless sensor node enough becomes a kind ofly has dynamic routing node arbitrarily to place transplantability good; System's reconfigurability is strong; Cost is low; Single node damages does not influence whole Network Transmission collection, warning function automatically, and accurately monitoring and flexible characteristics carries out the wireless sensor network of temperature and humidity monitor to grain depot.Thoroughly break away from conventional artificial and made a copy of method, made up grain feelings data analysis decision-making master system and detect the humiture in the silo in real time, guaranteed humiture environment suitable in the silo.
2, adopt the sub-clustering route technology to transmit data with the routing algorithm that single, multi-hop routing algorithm combine.If adopt in the past directly transmit the mode of data from sensor node to the base station; Because the distance of nodal point separation base station is different, node energy consumption is too unequal, and some node energy consumes excessive; Apart from root node distance far away more node to transmit the energy of consumption of information big more, easier death.In this patent design, adopt the single-hop routing mechanism to transmit data between a bunch interior nodes and bunch node, adopt the multi-hop routing mechanism to transmit data between bunch node and between a bunch node and the base station; And adopt the mode of setting certain threshold value to come a polling bunch node; Guarantee the mean consumption of node energy, prevented the too fast death of some node, influenced the networking of node; And reduced power consumption, prolonged the working time of node.
3, adopted the time slot arouse machine processed, for the wireless networking mode of most no time slot arouse machine processed, also consumed energy when idle has strengthened energy consumption.In this patent, node is accomplished the laggard sleep pattern of going in work, has reduced the energy consumption of node, has prolonged the serviceable life of node.
4, having adopted power detector, is that the WV of used devices such as microprocessor system, peripheral circuit, CC1100 wireless module all is operated in 3V, so native system adopts No. 5 alkaline batteries of 2 joints as power supply.And along with the operation of total system, cell voltage can descend thereupon lentamente, so need when supply voltage drops to the critical value of system works, CPU can in time detect and in time make a response.This just needs sensor node that a more effective battery electric quantity monitoring means is arranged, and the electric voltage observation circuit of the Mica2 node of employing University of California Berkeley development is monitored the supply situation of power supply among the design.
 
Description of drawings:
Fig. 1 is a this patent system architecture synoptic diagram.
Fig. 2 is a this patent sensor node system structural representation.
Fig. 3 is a this patent concentrator system architecture synoptic diagram.
Fig. 4 is a this patent concentrator memory system architecture synoptic diagram.
Fig. 5 is a this patent concentrator serial communication system structural representation.
Embodiment:
A kind of grain depot thermometric of wireless sensor network, wet device comprise a bunch interior nodes system 1, a bunch node system 2, concentrator system 3, master system 4.As shown in Figure 1; A bunch interior nodes 1 and a bunch node 2 detect data through radio circuit with single-hop routing mode wireless transmission; Between a bunch node 2 and bunch node 2 then through radio circuit with multi-hop routing mode wirelessly transmitting data; Between bunch node 2 and the concentrator 3 also is through the radio circuit wirelessly transmitting data, and data are transmitted through mode between RS232 and serial communication interface and the host computer 4 in concentrator system 3.
Bunch interior nodes 1 has identical construction with a bunch node 2, includes SHT11 low power consumption digital sensor 6, MSP430 wireless sensor node microprocessor 5, CC1100 radio circuit 10, JTAG debugging interface 7, AT45DB041 storer 8, power-supply system 9 etc.As shown in Figure 2; Low power consumption digital sensor 6 links to each other with MSP430 microprocessor 5 with clock line through data line; Radio circuit 10 links to each other with microprocessor 5 through the SPI data bus; JTAG debugging interface 7 links to each other with microprocessor 5 through signal wire; Each interface of storer 8 links to each other with the universaling I/O port of microprocessor 5, and each interface of radio circuit 10 links to each other with microprocessor 5 universaling I/O ports through 4 line spi bus, and power-supply system 9 links to each other with each device VCC interface respectively and supplies power and be provided with electric voltage observation circuit.
The concentrator system architecture mainly contains following a few part and constitutes: several parts such as CC1100 radio circuit 10, STC89LE58RD+ microprocessor 11, reset circuit 16, key circuit 12, liquid crystal display circuit 13, memory circuit 14, serial communication circuit 15.As shown in Figure 3, each peripheral circuit of processor 11 and all the other links to each other; Radio circuit 10 links to each other with the universaling I/O port of microprocessor 11 through 4 line spi bus; The MAX810R chip 16 that resets links to each other with the reseting interface of microprocessor 11; Key circuit 12 links to each other with interrupt interface, general-purpose interface, the timer interface of microprocessor 11 respectively; Liquid crystal display circuit 13 directly links to each other with microprocessor 11, and memory circuit 14 links to each other with the general-purpose interface of microprocessor 11, and serial communication circuit 15 links to each other with serial input, output terminal RXD, the TXD of microprocessor 11.Above-mentioned memory circuit is as shown in Figure 4, comprises 74HC573 latch 17 and HK1255-7 storer 18, and the control bit interface of latch 17 links to each other with the universaling I/O port of microprocessor 11, and storer 18 links to each other with the corresponding interface of latch 17; The formation of serial communication circuit 15 mainly is that RS232 is linked to each other with serial row communication interface.
The host computer host computer of communicating by letter with concentrator adopts the RS232 transmission mode; Above-mentioned serial communication circuit is as shown in Figure 5; RS232 serial communication module 19 links to each other with serial input, output terminal RXD, the TXD of STC89LE58RD+ microprocessor 11, and RS232 links to each other with serial input, output terminal PC RXD, the PC TXD of host computer 21 through Serial Port Line 20 simultaneously.Utilize the serial ports of concentrator that the Monitoring Data that collects is uploaded to host computer, host computer is also given concentrator through the serial ports transmitting order to lower levels.We have defined the transmission control command in transmission frame, adopt acknowledgement mechanism to guarantee to transmit accurately and reliably data.

Claims (1)

1. the grain depot thermometric of a wireless sensor network, wet device; Comprise low power consumption digital sensor SHT11, wireless sensor node microprocessor MSP430, radio circuit CC1100, debugging and download interface (JTAG&UTRA), storer AT45DB041, power-supply system, several parts such as microprocessor STC89LE58RD+, reset circuit, key circuit, liquid crystal display circuit, memory circuit, serial communication circuit; It is characterized in that:
1), SHT11 low power consumption digital sensor 6 links to each other with MSP430 microprocessor 5 with clock line through data line; CC1100 radio circuit 10 links to each other with MSP430 microprocessor 5 through the SPI data bus; JTAG debugging interface 7 links to each other with MSP430 microprocessor 5 through signal wire; Each interface of AT45DB041 storer 8 links to each other with the universaling I/O port of MSP430 microprocessor 5, and power-supply system 9 links to each other with each device VCC interface respectively and supplies power and be provided with electric voltage observation circuit;
2), CC1100 radio circuit 10 links to each other with the universaling I/O port of STC89LE58RD+ microprocessor 11 through 4 line spi bus; The MAX810R chip 16 that resets links to each other with the reseting interface of STC89LE58RD+ microprocessor 11; Key circuit 12 links to each other with interrupt interface, general-purpose interface, the timer interface of STC89LE58RD+ microprocessor 11 respectively; Liquid crystal display circuit 13 directly links to each other with STC89LE58RD+ microprocessor 11; Memory circuit 14 links to each other with the general-purpose interface of STC89LE58RD+ microprocessor 11; Serial communication circuit 15 links to each other with serial input, output terminal RXD, the TXD of STC89LE58RD+ microprocessor 11, and memory circuit is as shown in Figure 4, comprises 74HC573 latch 17 and HK1255-7 storer 18; The control bit interface of 74HC573 latch 17 links to each other with the universaling I/O port of STC89LE58RD+ microprocessor 11, and HK1255-7 storer 18 links to each other with the corresponding interface of 74HC573 latch 17; The formation of serial communication circuit 15 mainly is that RS232 is linked to each other with serial communication interface;
3), the host computer host computer of communicating by letter with concentrator adopts the RS232 transmission mode; Above-mentioned serial communication circuit is as shown in Figure 5; RS232 serial communication module 19 links to each other with serial input, output terminal RXD, the TXD of STC89LE58RD+ microprocessor 11; RS232 links to each other with serial input, output terminal PC RXD, the PC TXD of host computer 21 through Serial Port Line 20 simultaneously
Utilize the serial ports of concentrator that the Monitoring Data that collects is uploaded to host computer, host computer is also given concentrator through the serial ports transmitting order to lower levels.
CN2010105729147A 2010-12-06 2010-12-06 Grain bin temperature and humidity measuring device of wireless sensor network Pending CN102486389A (en)

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Publication number Priority date Publication date Assignee Title
CN103177668A (en) * 2013-03-05 2013-06-26 四川省电力公司达州电业局 Liquid crystal display (LCD) device for warehouse management
CN103415087A (en) * 2013-07-23 2013-11-27 江苏大学 Experimental method and device for studying influences of temperature and humidity on wireless signal fading characteristics
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CN105554911A (en) * 2015-12-25 2016-05-04 重庆邮电大学 Wireless sensor network communication system based on Wi-Fi
CN105466499A (en) * 2016-01-14 2016-04-06 昆明美光科技有限公司 Tobacco leaf alcoholization storage low-power long-endurance humiture hydrogen phosphide monitoring device
CN106643876A (en) * 2016-11-17 2017-05-10 安康学院 Wireless sensor and wireless sensor system
CN106600928A (en) * 2016-11-24 2017-04-26 广西大学 Wireless grain situation monitoring system
CN111182608A (en) * 2020-01-10 2020-05-19 北京航天测控技术有限公司 LoRa communication method based on multipath technology

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