嵌入式无线楼宇对讲系统的应用研究
摘要
楼宇对讲系统是住宅建设中不可缺少的组成部分,本论文围绕研制一种满足现代楼宇建设需要的无线对讲系统而开展应用研究。
嵌入式无线楼宇对讲系统是嵌入式技术和无线通信技术的有机结合,该系统由单元门主机和用户分机两大部分组成。单元门主机为楼下单元门对讲系统,主要功能是呼叫正确的用户分机,接收、发送无线通信数据,开启电控门锁等。硬件组成上包括开关电源电路、微控制器电路、无线通信电路、振铃电路、键盘扫描电路、语音输入电路、语音输出电路和继电器控制电路。用户分机为楼上用户终端,主要功能是识别主机呼叫地址,建立或切断无线通信,启动继电器等。硬件组成上包括微控制器电路、无线通信电路、振铃电路、语音输入电路、语音输出电路、摘机控制电路和继电器按键电路。本论文所采用的核心控制微处理器芯片为AVRmega8,用其控制nRF2401无线通信模块及其外围电路,实现了楼宇无线对讲功能。
嵌入式无线楼宇对讲系统的软件开发采用AVRGCCIDE开发平台,应用C语言为开发工具,编写了完整的系统代码。尽管nRF2401无线通信模块对用户是透明的,但仍需建立一定的软件通信协议。论文中提出软件方式实现半双工通信模拟双工通信的方法,将其应用到实际系统当中实现了一点对多点的无线通信。
在论文的最后对软件与硬件统调的过程进行了阐述,对论文开始提出的各项指标都给出了相应的测试方案和实现过程。通过测试表明:本系统软硬件工作正常,能够实现无线对讲功能,通话质量较好,通信距离约为65m。
Building conversational system is the essential part in housing construction, and the theme of this paper is a research,which satisfies the demands of building construction.
Embedded wireless building conversational system is the combination of embedded technology and wireless communication technology, and it consists of the master and the slave. The master located downstairs carries out the calling of correct user, receives and transmits wireless data, opens unit lock and so on. There are many circuits in hardware, including switch power circuit, microcontroller circuit, wireless communication circuit, ringing circuit, keyboard scanning circuit, audio input/output circuit and relay controlling circuit. The slave is a user terminal which carries out address identification of the master calling, builds or cuts the communication between the master and the slave, and starts the relay. It is similar with the master in composition. In this paper Atmega8 is used as a core to control nRF2401 wireless communication module and other components to actualize the wireless talkback function.
AVRGCCIDE is used as the software development platform in this paper, and all of the codes are programmed by C language. Though communication module of nRF2401 is transparent for users, some software communication protocols are still required. This paper puts forward a method about using half-duplex communication to simulate duplex communication with software, which is used in communication based on one point to multi-points.
In the end of this paper debugging indexes and methods are proposed, and the testing results are explained. It shows that the system works normally, and can carry out wireless talkback function; quality of conversation is good, the communication distance is about 65m.
嵌入式无线楼宇对讲系统是嵌入式技术和无线通信技术的有机结合,该系统由单元门主机和用户分机两大部分组成。单元门主机为楼下单元门对讲系统,主要功能是呼叫正确的用户分机,接收、发送无线通信数据,开启电控门锁等。硬件组成上包括开关电源电路、微控制器电路、无线通信电路、振铃电路、键盘扫描电路、语音输入电路、语音输出电路和继电器控制电路。用户分机为楼上用户终端,主要功能是识别主机呼叫地址,建立或切断无线通信,启动继电器等。硬件组成上包括微控制器电路、无线通信电路、振铃电路、语音输入电路、语音输出电路、摘机控制电路和继电器按键电路。本论文所采用的核心控制微处理器芯片为AVRmega8,用其控制nRF2401无线通信模块及其外围电路,实现了楼宇无线对讲功能。
嵌入式无线楼宇对讲系统的软件开发采用AVRGCCIDE开发平台,应用C语言为开发工具,编写了完整的系统代码。尽管nRF2401无线通信模块对用户是透明的,但仍需建立一定的软件通信协议。论文中提出软件方式实现半双工通信模拟双工通信的方法,将其应用到实际系统当中实现了一点对多点的无线通信。
在论文的最后对软件与硬件统调的过程进行了阐述,对论文开始提出的各项指标都给出了相应的测试方案和实现过程。通过测试表明:本系统软硬件工作正常,能够实现无线对讲功能,通话质量较好,通信距离约为65m。
Building conversational system is the essential part in housing construction, and the theme of this paper is a research,which satisfies the demands of building construction.
Embedded wireless building conversational system is the combination of embedded technology and wireless communication technology, and it consists of the master and the slave. The master located downstairs carries out the calling of correct user, receives and transmits wireless data, opens unit lock and so on. There are many circuits in hardware, including switch power circuit, microcontroller circuit, wireless communication circuit, ringing circuit, keyboard scanning circuit, audio input/output circuit and relay controlling circuit. The slave is a user terminal which carries out address identification of the master calling, builds or cuts the communication between the master and the slave, and starts the relay. It is similar with the master in composition. In this paper Atmega8 is used as a core to control nRF2401 wireless communication module and other components to actualize the wireless talkback function.
AVRGCCIDE is used as the software development platform in this paper, and all of the codes are programmed by C language. Though communication module of nRF2401 is transparent for users, some software communication protocols are still required. This paper puts forward a method about using half-duplex communication to simulate duplex communication with software, which is used in communication based on one point to multi-points.
In the end of this paper debugging indexes and methods are proposed, and the testing results are explained. It shows that the system works normally, and can carry out wireless talkback function; quality of conversation is good, the communication distance is about 65m.
引文
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[25]张克满,史仪凯.基于DSP和nRF2401芯片的数字无线视频采集系统设计[J].微电子学与计算机,2005,22(3):93-95.
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[27]刘立新,李国辉,郝云芳.基于nRF2401的无线自动抄表系统[J].微计算机信息,2006,(25):158-160.
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