共查询到20条相似文献，搜索用时 62 毫秒
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给出了一种风光互补发电系统蓄电池动态数据采集和无线通信的方法.针对蓄电池充放电的电压、电流及温度等参数,设计了硬件电路并编写了上位机软件,用NRF2401芯片进行实时数据采集与无线传输,分析了NRF2401芯片的无线通信工作程序和信号调制解调办法,完成了风光互补发电系统蓄电池动态参数的监测和存储. 相似文献
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针对路灯监控技术的发展现状,提出了一种基于CAN总线的LED路灯集群监控系统。系统由CAN通信主控机和若干个CAN路灯节点构成,给出了软硬件设计方案,对CAN通用应用层协议的开发、报文收发等关键技术进行了重点研究。系统经测试,达到了设计要求,工作稳定可靠,可移植到其他分布式集群控制系统中,具有实际应用价值。 相似文献
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结合技术发展和应用趋势,梳理了物联网的基本概念,讨论了物联网的体系结构和相关技术.基于nRF2401芯片的功能完成了物联网小系统硬件以及软件设计,提出在无线局域网通信技术上建立一个小型的物联网系统的基本方法,并展望了物联网技术的前景. 相似文献
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nRF2401是Nordic公司推出的单片2.4GHz无线收发一体芯片,只需少量外围元件便可组成射频收发电路,可以方便地使用在无线控制系统中。文章主要介绍在PIC单片机中使用nRF2401收发数据的硬件电路及其PICC语言的详细实现。 相似文献
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针对数据采集系统中有线的数据采集方式存在的可移动性差、电缆铺设受现场环境限制的缺陷．采用短距离无线通信技术和USB（Universal Serial Bus）接口技术相结合的方法．设计并实现了一个基于nRF905、PDIUSBD12和AT89S52的无线数据采集系统。 相似文献
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分布式无线农业信息采集系统的设计与实现 总被引：2，自引：1，他引：1
提出了一种基于nRF905的前端分布式无线传感器采集系统,将农业信息采集后无线传输至中心节点,由其经GSM网络转发至数据中心的决策支持系统进行数据处理和图形化显示,以辅助决策.介绍了无线采集终端的硬件设计,分析了基于nRF905的无线通信协议栈的设计思路与方法. 相似文献
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刘燎原 《商丘职业技术学院学报》2011,(5):58-61
温度检测是智能建筑中必不可少的一部分．本设计利用无线通信技术,采用单片机AT89S51作为主控制器,结合DALLAS公司的一线总线通信协议的数字温度传感器DS18820,利用具有多频段控制的单片收发芯片nRF905作为无线通信模块,设计了智能建筑中的无线温度检测系统．各个房间温度无线传输到主控室,主控室通过软件实时检测房间温度,并具有报警功能．该系统可以减少布线带来的各种干扰,提高系统可靠性,为智能建筑节约成本． 相似文献
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以无线通信收发芯片nRF24E1为核心,开发了一种无线通信系统,实现了光纤陀螺到计算机之间无线数据传输,降低了光纤陀螺性能测试中环境引起的误差,完善了光纤陀螺性能测试系统。系统体积小,装置简单,误码率低,运行稳定。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献