CN103675225A - Portable water quality detection instrument and method - Google Patents

Abstract

The invention belongs to the technical field of wireless sensor network and environmental pollution detection, and discloses a portable water quality detector, which includes a data collection node and a hand-held terminal, and the collection node includes a water quality sensor, a data collection interface, an MCU microprocessor and a Zigbee module , the handheld terminal includes a Zigbee coordinator and a data processing module, the MCU microprocessor reads the water quality data collected by the sensor through the data collection interface, and the Zigbee module transmits the collected water quality data to the Zigbee The coordinator, the data processing module analyzes, saves and displays the water quality data received by the Zigbee coordinator. The invention also discloses a water quality detection method. The invention overcomes the defects of the detection method of the traditional detector, not only is more comprehensive in the detection items, but also realizes the separation of the data collection part and the hand-held terminal, and the detection is more flexible.

Description

Portable water quality testing instrument and water quality testing method thereof

technical field

The invention belongs to the technical field of wireless sensor network and environmental pollution detection, in particular to a portable water quality detector and a water quality detection method thereof.

Background technique

Water is a natural resource that human beings depend on for survival. With the development of social economy and the acceleration of industrialization and urbanization, water pollution caused by human activities is increasing. Water quality testing is an important basis for water resource management and protection. The detection and treatment of water quality are related to the production of all walks of life and people's lives, so people have put forward better requirements for water quality detectors.

For water quality detection areas with low sampling frequency, manual sampling and laboratory analysis are generally adopted with portable water quality detectors. This kind of water quality detector usually consists of a multi-parameter water quality sensor (about 5-6 parameters) and a hand-held instrument. When testing, the sensor can be connected to the hand-held instrument to sample the water quality, and the collected water quality data can be displayed through the hand-held instrument. and store it. This method can only detect a small number of water quality parameters, and cannot fully reflect the water quality of the water area to be detected. The detected parameters are fixed and cannot be expanded according to requirements, and the sensor and the handheld instrument cannot be separated during detection, which brings inconvenience to the detection.

Contents of the invention

In order to solve the above technical problems, the present invention provides a portable water quality detector and its water quality detection method. Through short-distance wireless network technology, it overcomes the defects of the traditional detector detection method. It is not only more comprehensive in terms of detection items, but also realizes data The separation of the acquisition part and the handheld terminal makes the detection more flexible.

The technical scheme that the present invention takes is:

A kind of portable water quality detector, it is characterized in that, comprises data acquisition node and hand-held terminal, and described acquisition node comprises water quality sensor, data acquisition interface, MCU microprocessor and Zigbee module, and described hand-held terminal comprises Zigbee coordinator and data processing module, the MCU microprocessor reads the water quality data collected by the sensor through the data acquisition interface, and the Zigbee module transmits the collected water quality data to the Zigbee coordinator, and the data processing module is used for the Zigbee The water quality data received by the coordinator is analyzed, saved and displayed.

Further, there are multiple data collection nodes, and each data collection node forms a Zigbee network through its own Zigbee module and performs data transmission with the Zigbee coordinator of the handheld terminal.

Further, the MCU microprocessor of the data acquisition node is an STM32F107 chip.

Further, the handheld terminal further includes a GPRS module, and the data processing module of the handheld terminal transmits the water quality data to the remote server through the GPRS module.

Further, the handheld terminal further includes a GIS module, which collects current geographic information and adds the current geographic information to the water quality data.

Further, the handheld terminal adopts the Windows Mobile operating system and is equipped with a 3.5-inch touch screen, and the Zigbee coordinator of the handheld terminal communicates with the Zigbee module of the data acquisition node through serial port communication.

Further, the portable water quality detector also includes a power module, which provides electric energy for the portable water quality detector, and the power module includes a solar panel, a power control unit and a storage battery.

A water quality detection method based on the above-mentioned portable water quality detector, is characterized in that, comprises the steps:

(1) The MCU microprocessor of the data acquisition node reads the water quality data collected by the sensor through the data acquisition interface;

(2) The Zigbee module of the data acquisition node sends the water quality data to the Zigbee coordinator of the handheld terminal;

(3) The data processing module of the handheld terminal analyzes the water quality data received by the Zigbee coordinator, and saves it in the water quality database of the handheld terminal.

Further, the water quality data includes one or more of dissolved oxygen, turbidity, KMnO4 index, and conductivity.

Further, the handheld terminal includes a GPS module, and the GPS collects current geographic data and adds it to the water quality data.

Further, the following steps are also included:

(4) The handheld terminal analyzes the water quality data and displays it on the display device of the handheld terminal in real time;

Further, the handheld terminal includes a GPRS module, and the water quality detection method also includes the following steps:

(5) The GPRS module transmits the water quality data to the remote server through the TCP/IP protocol.

The beneficial effects of the present invention are:

(1) The present invention adopts Zigbee short-distance wireless network technology, and during detection, the data acquisition node and the handheld terminal are separated from each other, thereby reducing the development difficulty and cost of the instrument. Nodes and handheld terminals can realize wireless data transmission through the Zigbee network. The entire detection process is faster, more convenient and more intuitive. Users can complete the sampling of water quality data without being at the point to be tested for a long time, so that personal safety is also guaranteed. .

(2) In the detection method proposed by the present invention, the sensor interface of the node includes the general sensor interface on the market, and the user can select a suitable sensor for detection according to the detection requirements, and the bus protocol or output direct Digital sensors for digital signals, followed by some analog signal sensors. As a result, users not only have richer choices of sensor types, but this detection method has also been improved in terms of practicability and versatility.

(3) In the detection method proposed by the present invention, the nodes have good scalability. When there are many detection parameters, the detection of all items can be realized by adding nodes, and the newly added nodes and handheld terminals can realize automatic networking through Zigbee , which does not affect the entire detection process, so that comprehensive water sampling information can be obtained, and the detection results are more accurate.

(4) During detection, the handheld terminal adopts the Windows Mobile system, which has a good human-machine interface, and the user can touch it to view and store the collected water quality parameter values. In addition, the GPRS module that comes with the handheld terminal can also realize remote communication, and the development of the GIS electronic map system makes the whole inspection more intuitive, and the handheld terminal brings great convenience to users.

Description of drawings

Accompanying drawing 1 is the overall frame structure schematic diagram of the present invention;

Accompanying drawing 2 is the modular structure diagram of data acquisition node;

Accompanying drawing 3 is the overall framework diagram of solar power supply system;

Accompanying drawing 4 is a schematic diagram of the work flow of the power control module;

Accompanying drawing 5 is the software functional block diagram of handheld terminal;

Accompanying drawing 6 is this water quality detection flowchart.

Detailed ways

The specific implementation of the portable water quality testing instrument and the water quality testing method thereof of the present invention will be described in detail below in conjunction with the accompanying drawings.

In recent years, with the rapid development of wireless sensor network technology, wireless communication technology, embedded technology and computer technology, wireless sensor network technology has gradually been applied to the field of water quality detection.

The present invention is a conventional water quality detection method proposed based on short-distance wireless sensor network technology, wireless communication technology (GPRS), and mobile handheld terminal and database development. Realize the detection work of the water quality to be measured. The data acquisition node includes a water quality sensor, a data acquisition interface, an MCU microprocessor, and a Zigbee module. The MCU reads the water quality parameter values collected by the sensor through the data acquisition interface, and the Zigbee module transmits the collected data to the handheld terminal. The data acquisition node is designed with a variety of sensor interfaces, such as common bus interfaces, analog sensor interfaces, digital signal interfaces, etc. Users can choose corresponding sensors according to their own needs to complete water sampling. The mobile handheld terminal software is developed by WinCE and is used to receive, process and store the water quality data collected by the nodes, and display the measured water quality parameter values in real time. It has a GPRS module, which can transmit the collected water quality data to remote server. In addition, the staff can operate the water quality database on the handheld terminal through the user interface, such as viewing historical data, simple data analysis, etc.

The portable water quality detector of the present invention includes a data acquisition node and a hand-held terminal. The acquisition node includes a water quality sensor, a data acquisition interface, an MCU microprocessor and a Zigbee module, and the MCU microprocessor selects an STM32F107 chip. The handheld terminal includes a Zigbee coordinator and a data processing module. The MCU microprocessor reads the water quality data collected by the sensor through the data acquisition interface, and the Zigbee module transmits the collected water quality data to the Zigbee coordinator. Water quality data is analyzed, saved and displayed. When there are multiple data acquisition nodes, each data acquisition node forms a Zigbee network and transmits data to the Zigbee coordinator of the handheld terminal through its own Zigbee module. The handheld terminal can also include a GIS module and a GPRS module. The GPS module collects geographical information at that time as part of the water quality data. The data processing module of the handheld terminal transmits the water quality data to the remote server through the GPRS module.

The steps of the water quality detection method based on the portable water quality detector are as follows:

(1) The MCU microprocessor of the data acquisition node reads the water quality data collected by the sensor through the data acquisition interface;

(2) The Zigbee module of the data acquisition node sends the water quality data to the Zigbee coordinator of the handheld terminal;

(3) The data processing module of the handheld terminal analyzes the water quality data received by the Zigbee coordinator and saves it in the water quality database of the handheld terminal.

(4) The handheld terminal analyzes the water quality data and displays it on the handheld terminal in real time

(5) The GPRS module transmits the water quality data to the remote server through the TCP/IP protocol.

The content of each part is introduced in detail below.

Referring to accompanying drawing 1, this figure is the overall architecture diagram of the water quality detection method proposed by the present invention, which is mainly composed of mutually separated data acquisition nodes and handheld terminals, wherein the data acquisition nodes can be flexibly increased according to user needs to complete multi-clock parameter detection, complete the automatic networking function through Zigbee. The data acquisition node includes a variety of sensor interfaces. After the data collected by the sensor is simply processed by the MCU, the water quality data (such as dissolved oxygen, turbidity, KMnO4 index, COD information, etc.) is sent to the handheld terminal connected to the Zigbee coordinator through the Zigbee network . The handheld terminal data processing middleware preprocesses the received data (data filtering, garbled code processing, etc.), and stores it in the designed water quality database. The user software of the handheld terminal can realize the interaction with the database, and the user can access the database through the interface Water quality data in the system, such as real-time display of collected data, query of historical data, etc. During detection, the GPS module of the handheld terminal can complete the collection of geographical information of the detection point, and complete the identification through the electronic map of the handheld terminal to display its actual geographical location in the entire water area, making the entire detection more intuitive, thereby improving the detection process. Visibility. In addition, because the handheld terminal comes with a GPRS module, the user can also choose whether to transmit the collected water quality data to the remote monitoring terminal according to the specific situation, so as to complete the data analysis in time. Since the data transmission between the data acquisition node and the handheld terminal is completed through the Zigbee wireless network, it can complete the automatic networking work. When there are many water quality parameters to be detected, the user can expand according to the demand and use multiple nodes to complete the water quality project. Sampling work. Its main features are: the separation of data acquisition nodes and handheld terminals, the GIS electronic map indication of handheld terminals, the universal sensor interface and the development of WinCE embedded user software.

Referring to accompanying drawing 2, the data acquisition node includes MCU microprocessor, various bus protocol sensor interfaces, digital signal sensor interfaces, analog sensor interfaces and corresponding signal processing units, battery power supply unit, clock and reset module and Zigbee wireless radio frequency module . In the water quality data acquisition part, for SDI-12 sensors, the water quality data collected by the sensor is read through the SDI-12 bus protocol; for the bus protocol sensor signal, the corresponding communication protocol obtains the collected water quality data; for the industrial standard analog output signal , the mutual conversion between the connected sensors is realized through a multi-way switch, and the voltage signal that can be sampled by the MCU is output after passing through the I/V conversion circuit and the general signal conditioning circuit, and then converted by the AD module inside the single-chip microcomputer into a single-chip microcomputer. digital signal. After the above water quality data is processed by the single-chip microcomputer, it is packaged according to the self-defined data format, and then transmitted to the handheld terminal through Zigbee. The data sent by the data acquisition node to the handheld terminal mainly includes node address, detection item identifier and water quality data. In this detection method, a unified data protocol will be adopted, so not only the data transmission speed is improved, but also its accuracy and stability are also enhanced. The data collection node of the present invention has simple structure, small volume, and is easy to carry, and at the same time, it is easy to place during detection and convenient for sampling.

See Figure 3, the data acquisition node can be powered by battery or self-designed solar power supply. The former is mainly used for portable detection, while the latter makes the application of data acquisition node more extensive and flexible, and can be further applied to large range of online water quality monitoring. The solar power supply part of the power module part is mainly divided into solar panels, voltage stabilizing capacitors, power control modules, DC/DC conversion circuits, and power storage units composed of batteries and charging circuits. Among them, the power control module is the core part of the entire solar power supply system. It can convert the volatile direct current converted by the solar panel into stable direct current or alternating current, and realize the switch control and protection detection of the power supply system. The control and transfer of solar panel energy ensures the reliable and continuous operation of the power supply system. The power control module mainly includes two parts: the power detection circuit module and the power switching circuit module. The voltage detection mainly detects the output voltage of the solar panel and the voltage state of the battery. The current detection circuit mainly detects the charging current of the battery, and the temperature detection is used to detect the power supply. For the internal temperature of the system, the collected temperature data is sent to the single-chip microcomputer, and the single-chip microcomputer realizes the processing of temperature data and the control of temperature compensation, and the power switching circuit mainly refers to various switching circuits (photovoltaic panel power supply circuit, battery charging switch circuit, battery power supply circuit, etc.) switch circuit) and the peripheral circuit of the single chip microcomputer (temperature detection circuit, voltage detection circuit, current detection circuit, battery voltage detection circuit).

See attached drawing 4,

Referring to Figure 5, the hardware of the handheld terminal is an industrial-grade handheld terminal equipped with a 3.5-inch touch screen, GPS, GPRS, a large-capacity battery, and a module access interface. The handheld terminal and the Zigbee coordinator use serial port communication. By connecting to the Zigbee module, the handheld terminal powers on the module through level control to make the module supply power and work normally, and send data to the handheld terminal. The handheld device receives the data and processes it through analysis. , displayed on the handheld terminal in real time, and stored in the local database, and then the handheld terminal processes and encapsulates the data, and transmits the data to the server at the remote monitoring end through the TCP/IP protocol and GPRS, and stores and archives the data. The handheld terminal system adopts the WinCE development platform, and the monitoring terminal program is written in C#, which mainly includes the following functional modules: system setting module, data processing module, data analysis module, and GIS geographic information module. The system setting module mainly includes adding, deleting and modifying users, management of rights, and setting of some system parameters, such as data storage interval time, alarm threshold of water quality parameters, etc. The data processing module is mainly responsible for processing the data sent by the data acquisition node, analyzing the detection data according to the specified protocol, and displaying it through the chart. The data analysis module retrieves the required historical data through the database, performs statistical processing on the historical data, obtains reference data such as average value, maximum value, and minimum value, and exports weekly, monthly, and annual water quality information statistical tables, using charts Indicate the change trend of water quality, and make a water quality analysis through a certain reference quality grade of treated effluent quality. The GIS geographic information module uses an electronic map. The GPS module of the handheld terminal collects geographic information and marks its location directly on the map, and the water quality information of the detection point can also be directly displayed on the electronic map. Display the distribution of water quality in the area, and display the water quality in various thematic map forms, such as water temperature thematic maps, dissolved oxygen thematic maps, etc. The handheld terminal adopts Windows Mobile operating system, which is like a small computer, equipped with modules such as file system and application program. In the application program of water quality detection, a good man-machine interface is designed, and it adopts touch operation, which can not only view the collected Water quality parameter values can also be stored in the local database of the handheld terminal or transmitted to the water quality monitoring center through the GPRS module. In addition, the GIS electronic map system in the handheld terminal application program can mark the specific location of each data collection node, making the detection more intuitive and bringing great convenience to users.

Referring to Figure 6, first place the data acquisition node at the detection point according to the requirements, collect water quality data through the sensor connected by the user, and then process the collected data by the microprocessor of the node, and package it into a custom data format, through Zigbee module sends to the handheld terminal. The Zigbee coordinator of the handheld terminal receives the water quality data from the nodes. On the one hand, it processes all kinds of data through the data processing middleware of the handheld terminal, and then stores them in the database of the handheld terminal. Real-time values of parameters, operations on databases, viewing electronic maps, etc. For example, the user can click the remote transmission button on the interface to transmit the data to the remote monitoring terminal through GPRS for the use of relevant departments; open the GIS geographic information system, the position of the detection point can be directly marked on the electronic map, and by clicking the mark The water quality parameter value of the node can be viewed, and the user can also set parameters to export a specific water quality parameter thematic map; after entering the data analysis section, click Data Query, and query the detailed data information of a certain parameter in a certain period of time through conditional query , and displayed through the chart, when the required parameters are input, click the statistical analysis, the system can automatically calculate the required statistical information, and can also be displayed intuitively through tables or charts.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be considered Be the protection scope of the present invention.

Claims (12)

1. a portable water quality detector, it is characterized in that: comprise data acquisition node and handheld terminal, described acquisition node comprises water quality sensor, data acquisition interface, MCU microprocessor and Zigbee module, described handheld terminal comprises Zigbee telegon and data processing module, described MCU microprocessor reads by described data acquisition interface the water quality data that described sensor gathers, by described Zigbee module, collection water quality data is transferred to described Zigbee telegon, the water quality data that described data processing module receives described Zigbee telegon is analyzed, preserve and show.

2. portable water quality detector according to claim 1, it is characterized in that: described data acquisition node is a plurality of, each data acquisition node Zigbee telegon that all the Zigbee module by separately forms Zigbee network and described handheld terminal carries out data transmission.

3. portable water quality detector according to claim 1 and 2, is characterized in that: the MCU microprocessor of described data acquisition node is STM32F107 chip.

4. portable water quality detector according to claim 1 and 2, is characterized in that: described handheld terminal also comprises GPRS module, and the data processing module of described handheld terminal is sent to remote service end by described GPRS module by water quality data.

5. portable water quality detector according to claim 1 and 2, is characterized in that: described handheld terminal also comprises GIS module, and described GIS module gathers current geography information and current geography information is added in described water quality data.

6. portable water quality detector according to claim 5, it is characterized in that: described handheld terminal adopts Windows Mobile operating system, be furnished with 3.5 cun of touch screens, the Zigbee telegon of described handheld terminal adopts the Zigbee module communication of serial communication and described data acquisition node.

7. portable water quality detector according to claim 1 and 2, it is characterized in that: described portable water quality detector also comprises power module, described power module provides electric energy for described portable water quality detector, and described power module comprises sun power electroplax, power control unit and accumulator.

8. based on a water quality detection method for portable water quality detector as claimed in claim 1, it is characterized in that: comprise the steps:

(1) the described MCU microprocessor of described data acquisition node reads by described data acquisition interface the water quality data that described sensor gathers;

(2) the Zigbee module of described data acquisition node is sent to described water quality data the Zigbee telegon of described handheld terminal;

(3) water quality data that the data processing module of described handheld terminal receives described Zigbee telegon is analyzed, and is stored in the water quality data storehouse of described handheld terminal.

9. water quality detection method according to claim 8, is characterized in that: described water quality data comprises one or more in dissolved oxygen DO, turbidity, KMnO4 index, conductivity.

10. water quality detection method according to claim 8, is characterized in that: described handheld terminal comprises GPS module, and described GPS adds in described water quality data after gathering current geodata.

Water quality detection method in 11. according to Claim 8 to 10 described in any one, is characterized in that: also comprise the steps:

(4) described handheld terminal is analyzed and is presented in real time in the display device of described handheld terminal described water quality data.

12. water quality detection methods according to claim 11, is characterized in that: described handheld terminal comprises GPRS module, described water quality detection method also comprises the steps:

(5) described GPRS module is sent to described water quality data in remote server by ICP/IP protocol.

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