CN104767791A - Agricultural product storage and transportation control system based on wireless sensor network - Google Patents

Abstract

The invention relates to an agricultural product storage and transportation control system based on a wireless sensor network. The agricultural product storage and transportation control system comprises wireless sensor nodes and an embedded gateway management platform, wherein the wireless sensor network is arranged in a monitoring area and form a network in a self-organizing mode, acquired environment data are transmitted to a coordinator through a zigbee router through environment information acquisition nodes, the coordinator is responsible for receiving and processing all data information in the network and transmitting data to a local embedded gateway through an RS232 serial port, and the embedded gateway is responsible for analyzing, processing, storing, displaying and alarming the completed data and is also responsible for transmitting the acquired data information to a remote monitoring center and a user mobile phone through a 3G module.

Description

Agricultural product storage and transportation control system based on wireless sensor network

technical field

The invention relates to an agricultural product storage and transportation control system based on a wireless sensor network.

Background technique

The current agricultural product transportation system is not intelligent enough, and it cannot monitor the temperature and humidity of the environment where the agricultural products are located in real time and send them to the management personnel in time.

Contents of the invention

In order to solve the above problems, the present invention relates to an agricultural product storage and transportation control system based on a wireless sensor network. The system includes a wireless sensor node and an embedded gateway management platform; Network, the environmental information collection node transmits the collected environmental data to the coordinator through the zigbee router, and the coordinator is responsible for receiving and processing all data information in the network, and transmits the data to the local embedded gateway through the RS232 serial port. In addition to the analysis, processing, storage, display and alarm of the data, the gateway is also responsible for transmitting the collected data information to the remote monitoring center and the user's mobile phone through the 3G module.

Further, the environmental information collection node is composed of a data collection module, a processor module, a wireless communication module and a power supply module, each module is powered by the power supply module and put into operation, wherein the data collection module is responsible for data collection and data preprocessing; the processor module As the core part of the node, it is responsible for controlling the work of the entire node, while processing and storing the data of other nodes; the wireless communication module communicates with other nodes.

Further, the wireless sensor node is a CC2530-based wireless sensor node.

Further, the embedded gateway management platform takes S5PV210 as the core, and its core board resources include: 4 UARTs, 2 USB ports, data lines and liquid crystal display interfaces; the bottom board includes power circuits, interface circuits, touch screens, small Keyboard, USB storage circuit, etc.

Further, the 3G module adopts MF210 module.

Further, the system further includes a GPS module and a CMOS camera, and the GPS module and the CMOS camera are connected to the embedded gateway management platform.

Further, the wireless sensor network is divided into three types: terminal nodes, routing nodes, and coordinator nodes; the terminal nodes mainly complete the collection of environmental data; the routing nodes mainly complete the routing function; the coordinator nodes collect the data collected by the sensor network Convergence; when the system is working normally, different terminal nodes collect data and transmit it to the routing node wirelessly, the routing node performs data processing and forwards the data to the coordinator node along the dynamic route, and finally the coordinator The node sends the data summary to the embedded gateway node through the serial port.

Further, the terminal nodes include: refrigeration control nodes, temperature and humidity sensor nodes, gas concentration sensor nodes, illuminance sensor nodes and/or ventilation fan control nodes.

The system realizes the remote sending and receiving of data by adding a 3G module, and solves the problem of the distance limitation of the wireless sensor network, so that remote users can use the mobile communication network to complete the query of agricultural product storage and transportation information through computers and mobile terminals.

Description of drawings

The above and other aspects and advantages of the invention will become more readily apparent by describing in more detail exemplary embodiments of the invention with reference to the accompanying drawings, in which :

Fig . 1 is the system structural diagram of the agricultural product storage and transportation control system based on the wireless sensor network of the present invention;

Fig . 2 is a sensor node hardware structural diagram of the present invention;

Fig. 3 is the embedded gateway hardware structural diagram ;

Fig. 4 is the flow chart of the control method of embedded gateway;

Figure 5 is a diagram of the embedded gateway application program.

Detailed ways

Hereinafter, the invention will now be described more fully with reference to the accompanying drawings , in which various embodiments are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings .

The present invention combines the characteristics of the agricultural product storage and transportation control system, and the system structure of the agricultural product green storage and transportation control system based on the wireless sensor network is shown in FIG. 1 . The system is mainly composed of wireless sensor nodes based on CC2530 and embedded gateway management platform based on S5PV210 processor. Through this system, the collection, transmission, display, storage and equipment control of environmental parameters in the process of storage and transportation of agricultural products are realized. The wireless sensor network is mainly deployed in the monitoring area and forms a network in a self-organizing manner. The environmental information collection node transmits the collected environmental data to the coordinator through the zigbee router. The coordinator is responsible for receiving and processing all data information in the network, and The data is transmitted to the local embedded gateway through the RS232 serial port. The embedded gateway is not only responsible for the analysis, processing, storage, display and alarm of the data, but also responsible for transmitting the collected data information to the remote monitoring through the 3G module. Center and user mobile phones.

1 system hardware

1.1 Wireless sensor network hardware design

Wireless sensor network applications require low transmission latency and extremely low power consumption to extend battery life. ZigBee has the advantages of high communication efficiency, low complexity, low power consumption, low speed, low cost, high security, etc., making it suitable for wireless sensor networks. Zigbee is an emerging short-range, low-rate wireless network technology, mainly used for short-range wireless connections. It has its own protocol standard, which coordinates and communicates among thousands of tiny sensors.

The environmental information acquisition node is composed of a data acquisition module, a processor module, a wireless communication module and a power supply module. Each module is powered by the power supply module and put into operation. The block diagram of the working structure of the module is shown in Figure 2. The functions of each module are as follows: The main function of the module is responsible for data collection and data preprocessing; as the core part of the node, the processor module is responsible for controlling the work of the entire node, while processing and storing the data of other nodes; the main job of the wireless communication module is to communicate with other nodes. The design of wireless sensor network focuses on factors such as low cost, low power consumption, stability and reliability.

(1) The CC2530 is a true System-on-Chip (SoC) solution for 2.4-GHz IEEE 802.15.4, ZigBee and RF4CE applications. It enables building powerful network nodes with very low overall material cost. The CC2530 combines the excellent performance of a leading RF transceiver, an industry-standard enhanced 8051CPU, in-system programmable flash memory, 8-KB RAM and many other powerful features.

(2) Sensor selection The sensor nodes need to complete the collection of various environmental factor data, mainly including environmental temperature and humidity, gas concentration and infrared alarm information. These information collections are completed by sensors, requiring the sensors to have higher precision and lower power consumption.

1.2 Hardware Design of Embedded Gateway Management Platform

As a centralized information processing and localized management platform for wireless sensor networks, gateway nodes need to have fast processing speed, strong information management functions and rich hardware peripheral interface resources. It uses a 32-bit RISC microprocessor based on the ARM CortexTM-A8 core, with a maximum operating speed of 1GHz, including 32/32KB data/instruction level-1 cache and 512KB level-2 cache. S5PV210 also provides a relatively rich peripheral interface, which can greatly reduce the cost of system development. In addition, it has the characteristics of high cost performance and low power consumption, which is very suitable for the development of embedded systems.

The present invention constructs a wireless sensor network gateway hardware platform with S5PV210 as the core, and the resources of the core board include: 4 UARTs, 2 USB ports, data lines and liquid crystal display interfaces. The backplane includes power supply circuit, various interface circuits, touch screen, keypad, USB storage circuit and so on. The embedded gateway hardware structure is shown in Figure 3.

(1) The power circuit provides the required power for each part of the greenhouse controller. The voltage required by the entire greenhouse controller is: 3.3, 4.2, 5.0V. The chips selected are LT1764 and MIC29302.

(2) The serial interface is not only responsible for the data transmission between the embedded gateway and the wireless sensor network coordinator, but also responsible for the debugging terminal function of the embedded gateway. Since the core board provides TTL level, the MAX3232 chip is used to convert the voltage A voltage that complies with the RS-232 standard.

(3) The 3G module uses ZTE's MF210 module to complete the long-distance wireless communication of the embedded gateway. It is stable, can send and receive short messages, and supports GPS, which can fully meet the data transmission requirements of wireless sensor networks.

(4) Memory The system expands 256MB DDR2RAM and 1GB SLC NAND Flash.

(5) The GPS module adopts the high-sensitivity navigation chip SIRF3, has 20 receiving channels, the design receiving sensitivity is -159DB, and the default communication rate is 9600.

(6) The CMOS camera is 0V3640 with an effective pixel of 320W (2048X1536).

(7) The WIFI module uses the USR-WIF1232 low-power series, and the standby power on the network is as low as 3.3V, 12mA.

(8) The liquid crystal display and the small keyboard circuit are used as the man-machine interface circuit to facilitate the user's operation of the greenhouse controller.

2 system software

2.1 Wireless sensor network software design

The software platform of wireless sensor network is composed of ZigBee protocol stack and its application layer software development.

2.1.1 ZigBee underlying protocol stack

The ZigBee underlying protocol adapts to the requirements of low cost, low energy, and high fault tolerance of wireless sensors. The basis of the Zigbee protocol is IEEE 802.15.4, but IEEE only deals with low-level MAC layer and physical layer protocols. Therefore, the Zigbee Alliance expands IEEE. Its network layer protocol and API are standardized. The ZigBee protocol stack is composed of various software code layers, which are application layer, application security layer, network layer, MAC layer and so on.

The present invention mainly aims at the actual needs of storage and transportation of agricultural products, and adopts a tree-like network topology structure. According to different functions, wireless sensor networks are divided into three types: terminal nodes, routing nodes, and coordinator nodes. The terminal node mainly completes the collection of environmental data; the routing node mainly completes the routing function; the coordinator node aggregates the data collected by the sensor network. When the system is working normally, different terminal nodes collect data and transmit it to the routing node wirelessly, the routing node processes the data and forwards the data to the coordinator node along the dynamic route, and finally the coordinator node sends the data to the coordinator node through the serial port. Data aggregates are sent to embedded gateway nodes.

For the software design of the node, the self-organizing networking and data collection of the wireless sensor network are realized mainly by calling the API function of the ZigBee protocol stack. The present invention further reduces the power consumption of the entire wireless sensor network by adopting the method of dynamically configuring timing data collection, timing sleep and wake-up.

2.1.2 Wireless sensor network application layer software

Application layer software development is mainly the writing of various sensor drivers and the writing of automatic control programs.

(1) Temperature and humidity sensor driver design

When the CC2530 microcontroller communicates with the SHT75 temperature and humidity sensor, it must first initialize the sensor, then write commands (read/write status register, temperature measurement, humidity measurement), and finally convert the data to complete the reading of the measurement data.

(2) Light sensor driver design

This system adopts HA2003 to collect illuminance information. When the illuminance changes, the light intensity value is converted into a voltage value, and then the voltage value is converted into 0-2V or 4-20mA by the conditioning circuit, so it is necessary to use the A/D converter integrated in the CC2530 to convert the analog signal into data signal.

(3) Driver program design for gas concentration sensor

A gas concentration sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. The probe head conditions the gas sample through the gas sensor, which usually includes filtering out impurities and interfering gases, drying or refrigeration treatment, sample suction, and even chemical treatment of the sample for faster measurement by the chemical sensor.

(4) Control node driver program design

The control node mainly controls the opening and closing of the equipment by comparing the real-time temperature and humidity, illuminance, and gas concentration data collected by the sensor with the threshold set by the system, so as to ensure that the agricultural products are stored under the best environmental conditions and prolong the production of agricultural products. shelf life.

2.2 Embedded gateway software design

The embedded gateway sets up the data communication channel between the wireless sensor network and the local area network, the Internet and the mobile 3G network, and connects the Internet of Things to the Internet. Through the gateway, users can remotely access all data information collected by the wireless sensor network through a PC or mobile phone, and can also remotely set the balance parameters of the system, and send control commands to the control nodes in the wireless sensor network, thereby realizing the storage and transportation of agricultural products. System remote control and monitoring.

The gateway is the main control center of the entire system. It connects with the ZigBee coordinator through a standard serial port and collects data uploaded by the wireless sensor network. After processing, the data is provided to the user on the one hand, and on the other hand, it can be used as a tool to maintain the balance and stability of the system. The data is preserved.

The embedded system is the core part of the gateway. It is responsible for coordinating the normal and orderly work of other devices. The wireless network card and wireless router establish a stable data communication channel for the Internet of Things to access the Internet. The 3G module is a transfer station for mobile phones to access the Internet of Things. The camera is responsible for transmitting monitoring images to the embedded system in real time, so that users can see various monitoring information on the touch screen display of the embedded system, the host computer, the Internet, and the mobile terminal. The GPS module is mainly responsible for providing navigation and geographic location information for the system. Through this module, the problem of agricultural product quality traceability can be solved. The flowchart of the control method of the embedded gateway is shown in FIG. 4 .

In order to realize the functions of the Internet of Things system, the development of the embedded gateway application program is mainly divided into three parts: the development of human-computer interaction interface, the development of data communication and the development of network. For the convenience of users, this system uses QT to develop the human-computer interaction interface, the operating system is linux, the serial communication method is used to realize the data communication between the gateway and the wireless sensor network coordinator, and the TCP/IP protocol is used to realize the network development. The gateway application architecture is shown in Figure 5.

The system management software is composed of environment monitoring module, 3G module, video monitoring module, and GPS positioning module. The environmental monitoring module is mainly composed of parameter setting module, data acquisition module, data processing module and data management module. The setting module mainly realizes the setting of various system parameters, such as the working mode setting and data sampling time setting of each wireless sensor node. The data acquisition module mainly realizes synchronous acquisition of multi-channel data, and mainly displays various monitoring indicators by means of dynamic real-time graphs and tables. The data processing module mainly completes the processing of the received data information, such as digital filtering, numerical calculation, etc. The data management module is mainly responsible for managing the data information collected by the sensor nodes, including storage, query, data analysis and statistics. This system uses a light database SQLite to realize the storage and management of the collected data, and can display the historical data of each monitoring index through graphs and tables. The data information of the embedded gateway can be transmitted to the local host computer through WIFI and Ethernet interfaces, but it is not convenient for remote users to access. This system realizes the remote sending and receiving of data by adding a 3G module, which solves the problem that the wireless sensor network is limited by distance , so that remote users can use the mobile communication network to complete the query of agricultural product storage and transportation information through computers and mobile terminals.

The above descriptions are only examples of the present invention, and are not intended to limit the present invention. Various suitable modifications and variations are possible in the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. An agricultural product storage and transportation control system based on a wireless sensor network, characterized in that: The system includes a wireless sensor node and an embedded gateway management platform; The wireless sensor network is deployed in the monitoring area and forms a network in a self-organizing manner. The environmental information collection node transmits the collected environmental data to the coordinator through the zigbee router, and the coordinator is responsible for receiving and processing all data information in the network. And transmit the data to the local embedded gateway through the RS232 serial port. In addition to completing the analysis, processing, storage, display and alarm of the data, the embedded gateway is also responsible for transmitting the collected data information to the remote through the 3G module. monitoring center and user mobile phones. 2. the agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1, is characterized in that: The environmental information acquisition node is composed of a data acquisition module, a processor module, a wireless communication module and a power supply module, each module is powered by the power supply module and put into operation, wherein the data acquisition module is responsible for data acquisition and data preprocessing; the processor module is used as the node The core part is responsible for controlling the work of the entire node, while processing and storing the data of other nodes; the wireless communication module communicates with other nodes. 3. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1 or 2, characterized in that: The wireless sensor node is a wireless sensor node based on CC2530. 4. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1 or 2, characterized in that: The embedded gateway management platform takes S5PV210 as the core, and the resources of its core board include: 4 UARTs, 2 USB ports, data lines and LCD interface; the bottom board includes power circuit, interface circuit, touch screen, small keyboard, USB memory circuits, etc. 5. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1 or 2, characterized in that: The 3G module adopts MF210 module. 6. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1 or 2, characterized in that: The system further includes a GPS module and a CMOS camera connected to the embedded gateway management platform. 7. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 1 or 2, characterized in that: The wireless sensor network is divided into three types: terminal nodes, routing nodes, and coordinator nodes; the terminal nodes mainly complete the collection of environmental data; the routing nodes mainly complete the routing function; the coordinator nodes aggregate the data collected by the sensor network; When the system is working normally, different terminal nodes collect data and transmit it to the routing node wirelessly, the routing node processes the data and forwards the data to the coordinator node along the dynamic route, and finally the coordinator node sends the data to the coordinator node through the serial port Data aggregates are sent to embedded gateway nodes. 8. The agricultural product storage and transportation control system based on wireless sensor network as claimed in claim 7, characterized in that: The terminal nodes include: refrigeration control nodes, temperature and humidity sensor nodes, gas concentration sensor nodes, illuminance sensor nodes and/or ventilation fan control nodes.