In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of no...In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of nodes; the lowenergy consumed and cost effective MSP430 chip is used as the main control chip of the processor unit; the transmission frequency of the wireless transmission unit is 433 MHz, which has the characteristics of low power consumption, high signal strength, long transmission distance and small signal attenuation during the transmission; the power supply system unit is composed of monocrystalline silicon solar panel and high performance rechargeable lithium ion battery. The selection basis of each unit is clarified in detail, and optimization is performed by hardware circuit and software program to further reduce power consumption. The power consumption of the node is calculated by the experiment, and the charging conditions of the solar panel used in the node is tested. The results show that the system can achieve the setting target through the selection and design.展开更多
养殖环境水质参数采集的智能化与信息化是保障养殖安全、提高养殖质量的关键技术之一,本文设计了一款适于水质参数监测的无线传感器网络节点及其网络系统。节点以MSP430F149为处理器,n RF905射频芯片及其外围电路为无线通信模块,BQ2057...养殖环境水质参数采集的智能化与信息化是保障养殖安全、提高养殖质量的关键技术之一,本文设计了一款适于水质参数监测的无线传感器网络节点及其网络系统。节点以MSP430F149为处理器,n RF905射频芯片及其外围电路为无线通信模块,BQ2057W充电管理芯片及其外围电路为太阳能充电模块,DOG-96DS溶解氧电极和PHG-96FS p H电极及其信号调理电路为传感器模块,并以该节点为硬件平台编写了通信协议、应用程序和数据监控中心软件,测试了节点功耗、通信距离以及锂电池充电时间。实验结果表明,该系统可实现水质参数的实时监测、实时显示和数据预警,具有远程数据管理功能。展开更多
This paper proposes a methodology for calculating the energy consumed by a Wireless Sensor Network as well as its throughput under the effect of a jamming node modelling interference to account for collisions and retr...This paper proposes a methodology for calculating the energy consumed by a Wireless Sensor Network as well as its throughput under the effect of a jamming node modelling interference to account for collisions and retransmissions. Accordingly, the proposed methodology takes into consideration retransmissions and data dropped due to interference and collisions simultaneously. Simulations are conducted using OPNET to model various scenarios utilizing off-the-shelf wireless communication standards, namely ZigBee, Wi-Fi and Low Power Wi-Fi. A figure of merit is developed to offer more representative results for applications with different requirements. In achieving different requirements for a given application, there is a clear trade-off between energy consumption and throughput.展开更多
A test pattern generator （TPG） which can highly reduce the peak power consumption during built-in self-test （BIST） application is proposed. The proposed TPG, called LPpe-TPG, consists of a linear feedback shift re...A test pattern generator （TPG） which can highly reduce the peak power consumption during built-in self-test （BIST） application is proposed. The proposed TPG, called LPpe-TPG, consists of a linear feedback shift register （LFSR） and some control circuits. A procedure is presented firstly to make compare vectors between pseudorandom test patterns by adding some circuits to the original LFSR and secondly to insert some vectors between two successive pseudorandom test patterns according to the ordinal selection of every two bits of the compare vector. Then the changes between any successive test patterns of the test set generated by the LPpe-TPG are not more than twice. This leads to a decrease of the weighted switching activity （WSA） of the circuit under test （CUT） and therefore a reduction of the power consumption. Experimental results based on some ISCAS＇ 85 benchmark circuits show that the peak power consumption has been reduced by 25.25% to 64.46%. Also, the effectiveness of our approach to reduce the total and average power consumption is kept, without losing stuck-at fault coverage.展开更多
基金Supported by the Special Foundation Program of President(14007)the Science and Technology Support Program of Tianjin(14ZCZDNC00005)+3 种基金the Modern Agricultural Industry System for Vegetables of Tianjin(ITTVRS2017018)the Commercialization and Promotion of Agricultural Research Findings of Tianjin(201601220)China Spark Program(2015GA610013)the Special Foundation of President(16005)~~
文摘In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of nodes; the lowenergy consumed and cost effective MSP430 chip is used as the main control chip of the processor unit; the transmission frequency of the wireless transmission unit is 433 MHz, which has the characteristics of low power consumption, high signal strength, long transmission distance and small signal attenuation during the transmission; the power supply system unit is composed of monocrystalline silicon solar panel and high performance rechargeable lithium ion battery. The selection basis of each unit is clarified in detail, and optimization is performed by hardware circuit and software program to further reduce power consumption. The power consumption of the node is calculated by the experiment, and the charging conditions of the solar panel used in the node is tested. The results show that the system can achieve the setting target through the selection and design.
文摘养殖环境水质参数采集的智能化与信息化是保障养殖安全、提高养殖质量的关键技术之一,本文设计了一款适于水质参数监测的无线传感器网络节点及其网络系统。节点以MSP430F149为处理器,n RF905射频芯片及其外围电路为无线通信模块,BQ2057W充电管理芯片及其外围电路为太阳能充电模块,DOG-96DS溶解氧电极和PHG-96FS p H电极及其信号调理电路为传感器模块,并以该节点为硬件平台编写了通信协议、应用程序和数据监控中心软件,测试了节点功耗、通信距离以及锂电池充电时间。实验结果表明,该系统可实现水质参数的实时监测、实时显示和数据预警,具有远程数据管理功能。
文摘This paper proposes a methodology for calculating the energy consumed by a Wireless Sensor Network as well as its throughput under the effect of a jamming node modelling interference to account for collisions and retransmissions. Accordingly, the proposed methodology takes into consideration retransmissions and data dropped due to interference and collisions simultaneously. Simulations are conducted using OPNET to model various scenarios utilizing off-the-shelf wireless communication standards, namely ZigBee, Wi-Fi and Low Power Wi-Fi. A figure of merit is developed to offer more representative results for applications with different requirements. In achieving different requirements for a given application, there is a clear trade-off between energy consumption and throughput.
文摘A test pattern generator （TPG） which can highly reduce the peak power consumption during built-in self-test （BIST） application is proposed. The proposed TPG, called LPpe-TPG, consists of a linear feedback shift register （LFSR） and some control circuits. A procedure is presented firstly to make compare vectors between pseudorandom test patterns by adding some circuits to the original LFSR and secondly to insert some vectors between two successive pseudorandom test patterns according to the ordinal selection of every two bits of the compare vector. Then the changes between any successive test patterns of the test set generated by the LPpe-TPG are not more than twice. This leads to a decrease of the weighted switching activity （WSA） of the circuit under test （CUT） and therefore a reduction of the power consumption. Experimental results based on some ISCAS＇ 85 benchmark circuits show that the peak power consumption has been reduced by 25.25% to 64.46%. Also, the effectiveness of our approach to reduce the total and average power consumption is kept, without losing stuck-at fault coverage.
