CN101281187B - Water environment monitoring node based on ZigBee wireless technique - Google Patents
Water environment monitoring node based on ZigBee wireless technique Download PDFInfo
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- CN101281187B CN101281187B CN2008100603639A CN200810060363A CN101281187B CN 101281187 B CN101281187 B CN 101281187B CN 2008100603639 A CN2008100603639 A CN 2008100603639A CN 200810060363 A CN200810060363 A CN 200810060363A CN 101281187 B CN101281187 B CN 101281187B
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Abstract
The invention relates to a water environment monitoring node based on ZigBee wireless technique. The prior technology has long monitoring period and large work intensity, and cannot reflect dynamic variation of water environment. The invention includes an electric power management module, a water quality parameter acquisition module, an MPU module and a ZigBee radio frequency module. The equipment adopts an MSP430F149 MPU, for analyzing and processing water environmental parameter, and controls the operating status of the ZigBee radio frequency module and the water quality parameter acquisition module. The MSP430F149 processor is interconnected to the water quality parameter acquisition module through a 12 bit A /D converter self integrated with the MSP430F149 processor, and is interconnected to the ZigBee radio frequency module through an SPI serial interface, meanwhile also controls a power supply management module to supply power through an analogue switch, so as to achieve the goal of energy-saving. The invention has low cost, and low power consumption; can be arranged in water environment for a long term, execute multiple parameter real time monitoring to the water environment, and complete the high-efficiency transmission of data, thereby having wide applications prospect in the water environment monitoring.
Description
Technical field
The present invention relates to a kind of wireless senser network node equipment that can be used for monitoring water environment, this equipment adopts low power processor and ZigBee Radio Transmission Technology efficiently, belongs to radio communication and embedded system technology field.
Background technology
Monitoring water environment is the important means of water resources management and protection; China's water scarcity, water are seriously polluted; obtain the water environment parameter how efficiently, in real time, exactly, research and development networkings, intelligentized water environment real-time monitoring system have become and have pressed for.
Existing monitoring water environment method mainly is divided into two kinds: the mode that 1) adopts portable water quality monitor artificial sample, lab analysis; 2) adopt the water environment automatic monitoring system of forming by remote monitoring center and several monitoring sub-stations.The former can't be to the water environment parameters remote real time monitoring, has that monitoring periods is long, labour intensity is big, data acquisition waits problem slowly, can't reflect the water environment dynamic change, is difficult for finding early pollution source and reports to the police.Though the latter can better solve the problem of above-mentioned existence, owing to cable laying is arranged in advance and set up the construction requirement of a plurality of monitoring sub-stations, so the system cost height is arranged, monitor the waters and be limited in scope, easily the monitored area caused brokenly shortcomings such as ring.
Wireless sensor network (Wireless Sensor Networks, WSNs) as an emerging technology, form by being deployed in cheap miniature nodes a large amount of in the monitored area, form the self-organizing network of a multi-hop by communication, gather and handle the perceptive object information in the monitored area collaboratively, and send to the observer.Its appearance has produced a kind of brand-new information and has obtained and tupe, in conjunction with sensors of various types, in various fields such as environmental monitoring, military investigation, Smart Home, intelligent transportation, Industry Control wide application prospect is arranged.Water environment real-time monitoring system based on wireless sensor network is that wireless sensor network is used the typical case aspect the environmental monitoring.Compare with existing water environment automatic monitoring system, have advantages such as little to eco-environmental impact, that monitored density is high and scope is wide, system cost is low based on the monitoring water environment system of wireless sensor network.
At present, based on the water environment real-time monitoring system of wireless sensor network, external relatively more typical representative has the EMNET system of U.S. Heliosware company and the Fleck system of Australian CSIRO.Parameters such as hydraulic pressure, pH value, conductivity, dissolved oxygen DO can be measured by the EMNET system, and wireless communication frequency band is 900MHz, and speed is 9.8kbps; The index that the Fleck system is mainly measured is: pH value, water temperature, conductivity, wireless communication frequency are 433MHz, speed 72kbps.But above-mentioned two kinds of system's acquisition parameter kinds are less, do not provide that video monitoring function, traffic rate to water environment is low, small product size is big, power consumption is higher, only is suitable as research, still can not use at the scene as utility system at present.
Monitoring system based on wireless sensor network generally includes sensor node, data basestation, monitoring center.A large amount of sensor node deployments are in the monitored area, to constitute network from the prescription formula, sensor node is gathered interested environmental information and is routed to data basestation, deliver to remote monitoring center by data basestation by wired or wireless mode, the user is configured and manages sensor network by monitoring center, issue monitoring content and collection Monitoring Data.Generally, various, the circumstance complication of monitored area type, there are shortcomings such as difficult wiring, cost height in wire transmission mode, be difficult to satisfy the requirement of data transmission, wireless transmission then has advantages such as networking is simple and convenient, cost is low, be not subjected to that geographical environment influences, and can realize the requirement of data transmission in the monitoring system well.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of sensor network monitoring node based on the ZigBee wireless technology is provided.Overcome the existing monitoring water environment device monitoring cycle long, effective poor, labour intensity big, the monitoring waters is limited in scope, system cost height and to problems such as the ecologic environment of water body damage.This node cost is low, low in energy consumption, can place water environment for a long time, the water body parameter is carried out multiparameter monitor in real time.Carry out data transmission by the ZigBee wireless technology, need not cable laying and set up a plurality of monitoring sub-stations.
Water environment monitoring node of the present invention comprises microprocessor module, ZigBee radio-frequency module, power management module and water quality parameter acquisition module.Microprocessor module is connected with amplifying circuit and ZigBee radio-frequency module in the water quality parameter acquisition module respectively; Power management module is connected with other modules respectively, is its power supply.
Microprocessor module adopts the MSP430F149 low power processor of TI company, is used to control communicating by letter between ZigBee radio-frequency module and sensor network nodes and gateway base station, and the water environment parameter of collection is done simple analysis and processing.
The ZigBee radio-frequency module adopts the CC2420 radio frequency chip, communicating by letter between the data monitoring node that is used to realize wireless sensor network and base station equipment.By SPI interface and the interconnection of MSP430F149 processor.The ZigBee radio-frequency module is supported 2.4GHz ZigBee/IEEE802.15.4 standard, can with the data monitoring node and the base station communication that are distributed in the monitoring waters.
Power management module uses the LS14500C battery of two joint 3.6V, and series connection forms the 7.2V power supply, produces 3.3V and 5V voltage by voltage conversion circuit, is each module for power supply on the node.
The water quality parameter acquisition module adopts the water quality parameter sensor of E+H company, is used to finish the data acquisition of water temperature, pH value, turbidity, conductivity, dissolved oxygen content.The weak voltage of sensor output, current signal change the normal voltage signal into by amplifying circuit.The MSP430F149 low power processor is analyzed and is handled the standard signal of amplifying circuit output, can realize the collection (comprising water temperature, pH value, turbidity, conductivity, dissolved oxygen content etc.) of multiple water quality parameter.
Water environment monitoring node based on the ZigBee wireless technology of the present invention can be gathered multiple water quality parameter (comprising water temperature, pH value, turbidity, conductivity, dissolved oxygen content etc.), water quality parameter is carried out simple process, and be sent to the base station by the data of ZigBee communication after with acquisition process.Node can receive the steering order that the base station sends simultaneously, and finishes corresponding operating (comprising configuration data monitoring node, Control Node duty, inquiry and collection relevant information etc.) according to command request.
This node has sensing, calculating and communication capacity, has low cost, low in power consumption, compares with existing water environment real-time automatic monitoring system, and following advantage is arranged:
1. can gather multiple water quality parameter, data acquisition wide coverage simultaneously.The present invention can gather, transmit multiple water quality parameter (comprising water temperature, pH value, turbidity, conductivity, dissolved oxygen content etc.) in real time.Sensor node deployment is convenient, is not subjected to the constraint of geographical environment, can monitor the variation of water in waters on a large scale.
2. its communication ability is strong.Adopt new 2) the intensive deployment of sensor multiple spot: a plurality of sensor nodes of intensive deployment can detect the water environment parameter of each wider bay of geographic range, and by the Intelligent Information Processing of bulk redundancy information being improved the precision of parameter detecting.
3. the node device environmental suitability is strong.Each parts of node all adopt the device that meets the technical grade standard, have stronger adaptive faculty in the open air under the harsh environmental conditions.Applied power source administration module, low power processor (MSP430F149) and low-power consumption transmission mode (ZigBee) have prolonged node life span in the open air.
4. data processing speed is fast, and function is strong.The present invention uses 16 high performance MSP430F149 as processor.Improved data processing and data transmission capabilities, strengthened system reliability simultaneously and helped from now on system upgrade and function renewal.
5. circuit structure is clear, and working stability is reliable.Each functional module of node device and interface definition are clear, and wherein the MSP430F149 processor is coordinated each functional module and finished the collection of data, processing and transfer function as the control center of whole node equipment.
6. system cost is low: with respect to existing water environment automatic monitoring system and artificial sample lab analysis method, equipment and artificial expense reduce greatly.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is a water quality parameter signal flow diagram of the present invention;
Fig. 3 is the monitoring water environment entire system framework synoptic diagram based on wireless sensor network;
Embodiment
Below in conjunction with accompanying drawing wireless senser network node equipment provided by the invention is further described.
Fig. 1 is the structural principle block diagram that can be used for the wireless sensor network node device of monitoring water environment provided by the invention, and this base station equipment comprises power management module 1, water quality parameter acquisition module 2, microprocessor module 3 and ZigBee radio-frequency module CC24204 four parts.All adopt existing mature technology in each module.Wherein,
Water quality parameter acquisition module 2 comprises: multiple water quality parameter sensor 2-1 and water quality parameter signal amplification circuit 2-2.Multiple water quality parameter sensor 2-1 can gather multiple water quality parameter (comprising water temperature, pH value, turbidity, conductivity, dissolved oxygen content), use water quality parameter sensor (the pH value sensor OrbiSint W CPS 11 of E+H company, dissolved oxygen content sensor OxyMax W COS41, conductivity sensor ConduMax W CLS12, turbidity transducer TurbiMax W CUS 31, temperature sensor uses the Pt100 temperature sensor that carries on the pH value sensor).Water quality parameter signal amplification circuit 2-2 is that core is built with operational amplifier TLC2252.Multiple water quality parameter sensor 2-1 output millivolt level weak voltage signal is converted to 5 tunnel 0 to 3.3v voltage signal by water quality parameter signal amplification circuit 2-2, sends into the A/D converter of microprocessor module 3, finishes the water quality parameter collection.
Figure 2 shows that water quality parameter signal flow diagram of the present invention.Multiple water quality parameter sensor 2-1 gathers the multiple water quality parameter at monitoring water environment scene, output millivolt magnitude voltage signals, amplify back outputting standard voltage signal via water quality parameter signal amplification circuit 2-2, transfer to the A/D converter of microprocessor module 3, be converted to the manipulable digital signal of microprocessor, water quality parameter signal after 3 pairs of A/D conversion of microprocessor module carries out simple analysis and processing, and transfer to ZigBee radio-frequency module CC2420 4 by spi bus, the water quality parameter signal is sent to the water quality parameter monitoring node or the base station equipment of closing on by ZigBee radio-frequency module CC2420 4 again.
In whole monitoring system, base station 8 is that ZigBee network 6 links together with 9 two heterogeneous networks of cdma network by protocol conversion with sensor network, serves as gateway between the two.The data stream of monitoring water environment system, state flow, command stream transmission situation are as follows.In observation process, the data monitoring node 5 that is distributed in the subregion 7 is gathered water environment parameters such as water temperature, pH value, dissolved oxygen content, turbidity, conductivity by water quality parameter acquisition module 2, utilizes ZigBee radio-frequency module CC24204 finally to be uploaded to base station 8 by ZigBee network 6 in the multi-hop mode.Base station 8 after carrying out simple analysis and handling, produces information such as whether transfiniting, whether need warning via receiving water environment parameter and ZigBee network 6 status informations.Water environment parameter of Cai Jiing and the ZigBee network 6 status informations warning message after together with analyzing and processing is sent to remote monitoring center 10 via cdma network 9 the most at last.Remote monitoring center 10 receives the various information that upload base stations 8, the analyzing and processing related data, and according to monitoring needs sending controling instruction to the base station 8.And after base station 8 receives instruction, make the control corresponding operation through decoding, and for example, sending controling instruction is to ZigBee network 6, and configuration-related data monitoring nodes 5 etc. satisfy remote monitoring center 10 simple control requirements.
This water environment monitoring node course of work is as follows:
The LS14500C battery of two joint 3.6V of power management module 1, series connection forms 7.2V power supply 1-1, by with LM2596-5.0 being the voltage conversion circuit module 1-2 of core, 2-2 provides 5V voltage for the water quality parameter signal amplification circuit, by with LM2596-3.3 being the voltage conversion circuit module 1-3 of core, for microprocessor module 3 and ZigBee radio-frequency module CC2420 4 provide 3.3V voltage.It is the voltage conversion circuit module 1-2 of core with LM2596-5.0 that microprocessor module 3 utilizes single-pole single-throw switch (SPST) ISL43110 control, do not gather at node under the situation of water quality parameter, stop voltage conversion circuit module 1-2 to water quality parameter signal amplification circuit 2-2 power supply, to reduce node energy consumption.Allowing with LM2596-5.0 when microprocessor module 3 is the voltage conversion circuit module 1-2 of core when being water quality parameter signal amplification circuit 2-2 power supply, and water quality parameter acquisition module 2 begins to carry out multiple water quality parameter collection.Wherein, multiple water quality parameter sensor 2-1 can collect multiple water quality parameter, comprise water temperature, pH value, turbidity, conductivity, dissolved oxygen content, multiple water quality parameter sensor 2-1 output millivolt level weak voltage signal, be converted to 5 the tunnel 0 to the voltage signal of 3.3v by water quality parameter signal amplification circuit 2-2, send into the A/D converter of microprocessor module 3, finish the water quality parameter collection.12 A/D converters of the multichannel of microprocessor module 3 are the analog signal conversion that 2 transmission of water quality parameter acquisition module come digital signal, and the digital signal after the conversion is carried out simple analysis and processing.Microprocessor module 3 is transferred to ZigBee radio-frequency module CC2420 4 to the water quality parameter signal after the analyzing and processing by the SPI interface, sends water quality parameter by the ZigBee wireless communications mode.
Water environment monitoring node based on the ZigBee wireless technology provided by the invention as the basic data acquisition equipment of whole monitoring water environment system, has been realized the wireless real-time monitoring to water environment.Fig. 3 is the monitoring water environment entire system configuration diagram based on wireless sensor network.Whole waters to be monitored is divided into plurality of sub-regions 7, and system architecture can be divided into three levels: data monitoring node 5 (node provided by the invention), the interior base station 8 of subregion, remote monitoring center 10 in the subregion.Wherein, in subregion 7, make up sensor network: ZigBee network 6 based on the ZigBee wireless technology, each base station 8 of subregion configuration, the a plurality of data monitoring nodes 5 in the ZigBee network 6 carry out data acquisition and status monitoring in the subregion 7 to being distributed in, and by cdma network 9 real time data of gathering are sent to remote monitoring center 10.Remote monitoring center 10 receives real-time video information and water environment parameter, the monitoring interface of user's hommization is provided, and has powerful data management and analytic function.
Claims (1)
1. based on the water environment monitoring node of ZigBee wireless technology, comprise microprocessor module, ZigBee radio-frequency module, power management module and water quality parameter acquisition module, it is characterized in that microprocessor module is connected with amplifying circuit and ZigBee radio-frequency module in the water quality parameter acquisition module respectively; Power management module is connected with other modules respectively, is its power supply; Wherein
Microprocessor module adopts the MSP430F149 low power processor, is used to control communicating by letter between ZigBee radio-frequency module and data monitoring node and ZigBee radio-frequency module and base station, and the water environment parameter of collection is done simple analysis and processing;
The ZigBee radio-frequency module adopts the CC2420 radio frequency chip, by SPI interface and the interconnection of MSP430F149 low power processor; The ZigBee radio-frequency module is supported 2.4GHz ZigBee/IEEE802.15.4 standard, communicating by letter between the data monitoring node that is used to realize wireless sensor network and base station equipment;
Power management module uses the LS14500C battery of two joint 3.6V, and series connection forms the 7.2V power supply, produces 3.3V and 5V voltage by voltage conversion circuit, is each module for power supply on the node;
The water quality parameter acquisition module adopts the water quality parameter sensor, is used to finish the data acquisition of water temperature, pH value, turbidity, conductivity, dissolved oxygen content; The weak voltage of sensor output, current signal change the normal voltage signal into by amplifying circuit; The MSP430F149 low power processor is analyzed and is handled the standard signal of amplifying circuit output, finishes the collection of multiple water quality parameter.
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