The design of breeding district soil information wireless acquisition system

Transcription

1 4th International Conference on Sensors, Measurement and Intelligent Materials (ICSMIM 015) The design of breeding district soil information wireless acquisition system Bai Haoran*1,a,Sun Yang1,b Bai Yumeng,c,Li Fengmei1,d 1 College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao China College of Commerce,Dalian University Technology Pajin, Panjin China a baihaoran111@16.com, b @qq.com, c @qq.com,dlifm1114@16.com Key words: Breeding district; soil environment; LPC1769; ZIGBEE wireless network; sensor Abstract: In order to solve backwardness information acquisition technology and cable transmission way, a breeding district soil information acquisition wireless system based on GSM/GPRS and ZIGBEE network was proposed on request of intelligent sense modern precision agriculture. The system composed of two parts which were data collection module and handheld device; data collection module consisted of End-device CC430 and SHT11 sensor which obtained the temperature data and humidity data of the breeding district soil information. The handheld device used LPC1769 processor as core of main CPU which composed of LPC1769 core microprocessor, CC430 coordinator, TFT_PQ.4 touch screen, SD card as well as peripheral circuits. The main CPU (LPC1769) was the ARM Cortex-M3 core processor of NXP, the handheld device instituted by LPC1769 could collect and monitor breeding district soil environmental information using the touch screen through ZIGBEE wireless network communication way. The collected data might store in the SD card which could be searched through GSM by remote people. The hardware configuration and software implementation were detailed description in this paper. The introduction Food production is indispensable to mankind, China's big population base, however, due to soil degradation, arable land is shrinking. In order to improve the food production, to improve food production equipment, through the high-tech equipment for crop to get the environment information (such as soil, temperature, humidity, etc.)[1], to improve the quality of breeding. Through the information collected, breeders to find reasons to plot yield difference, take reasonable control measures, according to the needs of the crop irrigation fertilization measures. Agricultural environment mainly include soil information, atmospheric conditions, atmospheric temperature and humidity, the soil is the basis of crop development and growth, soil condition directly affects the growth of crops. Soil moisture test mainly contains the following categories[-6]: (1) drying weighing. This method is the highest accuracy of soil moisture detection method. Use twice the weight difference before and after drying to detect soil moisture content. The method is simple in principle and high precision. But time-consuming, laborious detection speed is slow. () the electrical measuring method. Principle is the use of water and some parameters of electronic components the relationship between the indirect determination of soil water content. This system USES this approach. (3) the method of nuclear technology. The X-ray attenuation law, for example, high measuring precision, but due to the rays, radioactive, impossible job. The system saves manpower and material resources and financial resources, but also greatly save the time of access to information The authors - Published by Atlantis Press 438

2 overall system architecture Wireless acquisition system includes: main CPU LPC1769 and peripheral circuit, TFT_PQ.4 color LCD screen, ZIGBEE coordinator module, ZIGBEE wireless acquisition module. This system uses the ARM CPU LPC1769, as the core of the system control chip. Using sensors for data acquisition [7], with the data transmission on the GPRS connection by LPC1769 and dial the telephone, and information feedback in the form of short messages [8-9].Compared to the [10-11] cable transmission system, this system through the UART mode and CC430 coordinator to communicate, CC430 router by ZIGBEE network transmit collected data to the coordinator, finally transferred to the LPC179, soil in all parts of the community information will be stored in the SD card in the TXT file. Main chip LPC1769 will return to command, and process information by the coordinator will command back to the terminal node control pump irrigation. LPC1976 and ZIGBEE wireless acquisition ZIGBEE wireless network and LPC1769 through UART connection, LPC1769 by receiving ZIGBEE coordinator sent data, by the ZIGBEE network transmission [1] command control sensors to collect information. ZIGBEE wireless network and LPC1769 through UART connection, LPC1769 by receiving ZIGBEE coordinator sent data, by the ZIGBEE network transmission [1] command control sensors to collect information. wireless network design coordinator ZIGBEE coordinator is responsible for establishing and start in the network, the establishment of network flow chart. First system initialization, configuration ZIGBEE devices as the coordinator, chosen by the software channel, distribution, PANID, short address, set up network, receiving other nodes access request, to apply for the net node distribution in short address, send a response. Waiting for the receiving node to send data. the design of the wireless network terminal nodes Terminal node part is the lowest layer of the network, it is a sensor acquisition node. Soil temperature and humidity, light intensity will be collected by the terminal nodes and sent to the coordinator, again by the coordinator to LPC1769, displayed in TFT_PQ. 4 color LCD screen. Main collection of soil temperature and humidity parameters in this system, sensor SHT11 soil parameters, the sensor's internal structure as shown in figure 1, the typical circuit is shown in figure. 439

3 P1.7/RX/MI VCC 4 Cp 1 100nF VDD_3.3V_CC4 C14 C15 _CC4 C17 C16 0nF 0.1nF.uF _CC4 U1 _CC4 0 AVDD_SOC C18 _CC4 _CC4 41 AVDD_DREG 1uF 7 47 DVDD DVDD 4 DCOUPL P0 48 P.0 P1 46 R5 P.1/DD P 45 P./DC 4.7K _CC4 P10 9 P1.0/LED P11 8 P1.1/LED P1 6 VDD_3.3V P P13 5 P1. VCC P1.3 P P P1.4/CT/SS SHT11 Rp P1 P15 3 nreset 3 4 P1.5/RT/C 4.7K P0 P16 VDD 5 6 P1.6/TX/MO P00 P17 P17 1 DATA P01 P16 SCK 9 10 P0 P15 P00 11 P P14 P01 1 P0.0/A P0.1/A1 P04 P13 P P0./A/RX/MI P05 P1 P P0.3/A3/TX/MO P06 P11 P04 15 P P10 P05 16 P0.4/A4/CT/SS 1 P0.5/A5/RT/C P06 17 P0.6/A6 Header 11X P07 18 P0.7/A7 VDD_3.3V_CC4 R4 nreset 10 RESET 49 43K cc430 芯片 _CC4 L4 VDD_3.3V L5 VDD_3.3V_CC4 VDD_3.3V FBead D1 R6 FBead C19 C0 470 LED Red _CC4 AVD_DGUARD 40 DVDD_ADC 39 AVDD_ADC AVDDIF 36 AVDD_RF AVDD_SW AVDDRF1 30 AVDD_PRE AVDD_VCO 9 VCO_GUARD 8 7 AVDD_CHP 5 AVDD_IF1 3 RF_P TXRX_SWICH 33 RF_N 34 P..4/XOSC_Q P..3/XOSC_Q1 XOSC_Q1 XOSC_Q RBIAS1 RBIAS VDD 1.8V RREG_OUT AVDD_RREG 3 _CC4 VDD_3.3V_CC4 _CC4 C1 0nF C9 C10 10nF C11 C1 _CC4 _CC4 _CC4 _CC4 _CC4 RF TX RX SW RF R1 43K L1 nh AVDD 1.8V R3 L nh R 56K C X1 1 C3 33pF 0nF _CC4 3MHz 1.8nH X kHz C13 _CC4 _CC4 _CC4 _CC4 _CC4 _CC4 L3 C4 33pF C5 15pF C7 5.6pF 1 P1 C6 15pF RF-SMA _CC4 Figure 1 SHT11 internal structure Figure data acquisition principle diagram System initialization, manual configuration for the terminal nodes, send access request, received a request to confirm the coordinator to send, sensor nodes to join the network success, will be sent to the data collected the coordinator. ZIGBEE terminal nodes only responsible for sending and receiving data, so the terminal nodes can enter a dormant state, awakened by vibration internal crystal oscillator. LPC1769 with GPRS SIM300 communication Method using UART communication with SIM300 LPC1769, three-wire system, two signal lines and a common ground. SIM300 integrates the complete rf circuit and baseband processor of GSM, to provide users with a fully functional system interface. This system can be through hand-held devices to make calls, send a short message to breeders, convenient community breeding base of the selection and comparison. It s communication mainly by the AT command. The application of TFT_PQ. 4 and SD card TFT module for LCD display control adopts ILI935 chips. There are four ILI935 bus interface: i80 MPU interface system, VSYNC interface, SPI interface, RGB interface. This system adopts i80 MPU interface, it is parallel transmission mode. ILI935 LCD controller supports up to 56 k color, 18 or value. By adopting the working style of 8 bits of data transmission color value for each time, three times slower. In order to speed up the show, with 65 k color mode, as shown in figure 3. Figure 3 65 k transmission mode 440

4 Touch screen adopt XPT046 chip. LPC1769 processor through direct I/O port operation to interact with touch screen, read the touch screen information and UART serial port information. Infinite loop structure is used in the system the main function of six event query: waiting for touch screen buttons, accept UART interrupt, to process the information received, the update time, alarm information detection and data logging.liquid crystal display is given priority to with LPC1769 control chip. the system of information task feedback on the LCD screen, the screen has nine modules function of its execution steps are shown in figure 4. Figure 4 touchscreen program flow chart system experimental results LPC1769 handheld devices for breeding soil environment for on-site inspection, Sensor nodes will be collected by soil temperature, soil humidity wireless sending to handheld devices for display. Then such as time, temperature and humidity data records in the SD card. Table 1 for ZIGBEE values, this system can be used for breeding work. the conclusion This paper implements the plot breeding soil information wireless acquisition system design, this system has a large network capacity, self-organization, self-healing capability, characteristics of plug and play, all-weather and stable operation, without human intervention.and this system development is simple, high maneuverability, low power consumption, simple and stable, etc. Acknowledgement This paper was supported by the Nature Science Foundation of Shandong Province of China and QingDao science and technology plan projects under funds of ZR013CL01 and nsh respectively. Also this paper was Supported by National Natural Science Foundation of China ( , ), Natural Science Foundation of Shandong Province (ZR013FM01). Reference [1] mao-hua wang. "precision agriculture" development and engineering technology innovation [J]. Journal of agricultural engineering, 1999, 1 (1) 1-8. [] yue-ming zuo, WeiYong hai-chang wang, etc. The design of an intelligent electrical conductivity meter and study [J]. Journal of agricultural engineering, 001 ()

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