ZigBee Intelligent Water Saving irrigation system

0 Introduction

at present, the use of agricultural water-saving irrigation system imported from abroad has played a positive role in the improvement of irrigation level and water resource utilization rate, but due to the high system cost, incomplete parameter calibration, lack of relative high-level decision-making function, It is difficult to ensure the maintenance and updating of the system, and many problems restrict the use of agricultural water-saving irrigation system and large-scale popularization. According to the present situation , the intelligent water-saving irrigation system based on ZigBee Wireless Module is developed to improve the high-tech content of water-saving irrigation agriculture technology, and to establish a water-saving irrigation agricultural technology system suitable for our country.

This article takes ZigBee Wireless Module Technology, GPRS technology as the core, real-time acquisition of field soil temperature, humidity and other data ZigBee data collection, complete the application of intelligent water-saving irrigation system, monitor soil moisture and crop growth, realize the design idea of intelligent water-saving irrigation management.

1 ZigBee Introduction

ZigBeeThe predecessor of the technology is "Homerflite"Technology, whose core protocols are -years AMonth-EstablishedIEEE 802.15.4High-level applications, interoperability testing, and marketing, developed by2002years8month of the formation ofZigBeeThe Alliance is responsible. ZigBeeemphasis is placed on the features of low cost, power consumption, bidirectional transmission, and inductive network functions. IEEEWill eventuallyZigBeeaccepted asIEEE 802.15.4the Standard andZigBeeThe Alliance is working togetherWPANStandard-setting. ZigBeeas a wireless connection, you can work in2.14GH (Global Prevalence),868MHz (Popular in Europe)and the915MHz (American Popular) 3bands, each with a maximum ofkbit/,kbit/s,kbit/sTransmission rate, the transmission distance of the10~ 75m , but it can continue to increase in scope. Depending on the size of the transmitting power and the mode of application,1DeskZigBeedevices can connect up to254a similar device.

2 Overall scheme design of intelligent water-saving irrigation system

The intelligent water-saving irrigation systemZigBeeWireless sensor technology as the core, comprehensive utilization of wireless network technology,GPRSTechnology,InternetTechnology , water-saving irrigation technology and application automation control technology for accurate farmland information (field soil moisture, temperature and humidity, rainfall, evaporation, etc.) collected, throughInternetNetwork platform, network platform irrigation Management system, real-time remote monitoring of crop water demand and growth status, intelligent decision-making and realization of water-saving irrigation system solenoid valve to achieve automatic control, so that the traditional irrigation system from static to dynamic "artificial intelligence" transformation. Overall scheme structure of intelligent water-saving irrigation system1is shown.

Figure 1 ZigBee structure diagram of intelligent Water saving irrigation system

3 system function Module design

3.1 Irrigation Real-time Data acquisition module

system Irrigation Real-time ZigBee Data Acquisition The system consists of field soil moisture monitoring sensor system, temperature and humidity monitoring sensor system and rainfall evaporation monitoring sensor system. The function of this system is to collect the data of each sensor in the irrigation area in real time, and transmit to the data receiving system through ZIGBEE Digital transmission module network.

system by temperature, humidity ZigBee Data The collection and the data sends the end and the data receives the end two parts, sends the driven by temperature measurement cable, the collector, the detection extension composition, receives the driven by microcomputer, the test host composition. Each collector can be connected to multiple sensors, and a single detection extension can drive up to a maximum of one collector. The microcomputer of the receiving end mainly carries on the temperature data storage, the analysis, the management, the test host according to the computer to give the detection command to each detection extension in order to issue various orders, simultaneously receives each extension sends the sensor data transmits to the computer. The communication adopts time division multiplexing technology, which detects both the peer-to-peer communication between the host and the sender by means of scanning.

3.2 Data Communication Module system

ZigBeeWireless monitoring is mainly composed of various water level gauges, rainfall gauges and gate gauges distributed in the monitoring area, each unit of measurement is equipped with low-costZigBee Wireless ModuleThe remote node is used for uploading data in the wireless network, and the monitoring area is also distributed according to the distance.ZigBeeWireless Modulethe routing nodes make up the wirelessZigBeeDigital TransmissionNetwork, all hydrological data can be uploaded through this networkZigBeeA central node with almost unlimited coverage, no distance constraints, no network planning, and minimal maintenance; the builtZigBeeThe network can be either a star topology or a mesh network topology, regardless of the topologyZigBeeNetwork, according to the actual needs of the network, the design of a reasonable net structure. Receive fromZigBeeThe wireless sensor collects data, or transmits data from the network, transmits it to a remote computer system via data conversion, or accepts remote monitoring commands. The data of rainfall evaporation value, temperature and humidity collected by the data receiving system and the embedded computer system are numerically analyzed and calculated according to the irrigation parameters of the soil or irrigation objects of different crops, and the decision whether to irrigate and output the judgment result to the data transmitting system. The function of numerical calculation and processing system of data acquisition is to convert the result of computer judgment and result output into the wireless control instruction and send it to the control system.

3.3 GPRS Data Terminal module system

the system data collection mainly byGPRSdata transmission terminal, monitoring terminal,GPRSNetwork and Ground Monitoring center, and other parts of the collaboration completed. Among them, the irrigation system monitoring terminal to complete the data collection and processing work, the data collected throughZigBeeWireless sensor modules andGPRSthe data transmission terminal is connected andGPRSdata transmission terminal built-in embedded processor for processing and protocol encapsulation, and then sent toGPRSNetwork,GPRSThe network communicates with the ground Monitoring center through serial communication, and the monitoring center receives the data, analyzes and processes the data, and saves the valid data to the Monitoring Center database. GPRSthe module mainly includes data processing module, communication module, analog-Digital conversion module and display module four parts. The data processing module containsCPUChip,CPUIt is used for data transmission between communication module, analog-Digital conversion module and display module, in order to ensure that it is not lost due to power loss, usingFlashThe device stores the data.

4 Software Design of wireless temperature measurement system

The system software design is more complex, the whole software system process 2 , the key functions are as follows: Ds18b20 initialization and temperature acquisition function, transmit (receive) function, data display function, serial communication function, etc.

Figure 2 software flow of wireless temperature measurement system

5 Conclusion

This paper presents a method based onZigBee Wireless ModuleThe software design and implementation method of the water-saving irrigation system based on the sensor network technology, toZigBee Digital Transmission Moduleas the core, combined with embedded technology and water-saving irrigation technology, the field of soil moisture, temperature and humidity, rainfall, evaporation and other data in real-timeZigBeeDatacollection, byZigBeeWireless sensor network transmission data, through the development of water-saving irrigation decision-making system software calculation, output instructions, automatic control irrigation intelligent water-saving irrigation system.

ZigBee Intelligent Water Saving irrigation system