1、摘要 I 摘 要 随着信息科技的日益发展，智能家居逐渐得到普及，而远程家电控制系统则是智能 家居的一个重要组成部分。 本系统设计的是由用户通过拨打家里的电话来实现远程控制家用电器。本系统是以 AT89S52 为控制核心，通过振铃检测来实现模拟摘挂机；通过音芯片 ISD4004 完成语音 的录制和播放，用来提示用户进行密码输入等一系列的操作；通过解码芯片 MT8870 对 DTMF 信号进行解码，用按键操作来实现密码输入及对控制对象的选择；通过 ZigBee 模块组网来实现对具体家用电的控制。并结合具体的软件程序实现了远程家电控制系统。 振铃检测及模拟摘挂机部分则是本文的重点。 系统通过设计了一
2、个具有整流、 滤波、 稳压等一系列功能的模拟电路以及相应的软件程序来实现对电话线路中铃流信号的检 测和模拟摘挂机。并通过实际测试，最终实现了振铃信号检测及模拟摘挂机的功能。 关键词：远程家电控制；模拟摘挂机；MT8870；ISD4004；ZigBee Abstract II Abstract With the increasing development of information technology, smart home gradually gained popularity, and the remote appliance control system is the smart h
3、ome is an important component. This system is designed by the user by calling your home phone to remote control home appliances. The system is based AT89S52 as the control center via the ring detection to achieve analog hook; through a complete voice chip ISD4004 voice recording and playback, used t
4、o prompt the user for the password input and a series of operations; through the decoder chip MT8870 DTMF signals on decode the password with the key operation to achieve the object of the control input and choice; through networking ZigBee module to achieve the specific household electric control.
5、Combined with specific software programs to achieve the remote appliance control system. Ring detection and analogue hook part is the focus of this article. By designing a system with a rectifier, filter, regulator and a series of functional analog circuits and the software program to achieve the ri
6、nging signal on the telephone line and the analog detection hook. Through the actual test, and finally realize the ringing signal detection and simulation pick hang up function. Keywords: remote control of home appliances; analog hook and hang up; MT8870; ISD4004; ZigBee 目录 目 录 摘 要 .I Abstract . II 1 绪 论 1 1.1 设计背景 1 1.2 发展现状 2 1.3 功能及特点 3 2 总体设计 4 2.1 硬件设计 4 2.1.1 主要芯片 4 2.1.2 振铃检测及模拟摘挂机模块 9 2.1.3 DTMF 信号解码模块 . 9 2.1.4 语音提示模块 11 2.1.5 控制模块 12 2.2 软件设计 12 2.2.1 振铃计数部分 14 2.2.2 语音提示部分 14 2.2.3
