智能无线防盗报警器的设计

介绍一款功能丰富、易于扩展的家居智能电子系统，由AT89C51单片机控制电路、无线收发电路、DTMF（双音多频）电路、语音录放电路、电话接口电路等部分组成。系统核心功能是防盗报警，由无线门磁探测盗情，通过带编码、解码芯片的无线射频模块收发信号，进行现场报警，同时通过固定电话线以DTMF方式自动拨号，电话接通后向对方播放预先录制的报警信息。系统还可自动接通户主打回的电话，利用DTMF解码远程电话按键信号，传送到单片机，对室内开关电路进行控制。

Design of Intelligent Wireless Burglarproof Alarm System

This paper presents a home intelligent electronic system, which has rich functions and can be strengthened easily. It is composed of AT89C51 control circuit, wireless transmit and receive circuit, DTMF （Dual Tone Multi Frequency） circuit, voice record and play circuit, telephone interface circuit. Its primary function is burglarproof alarm. When the sensor gets a housebreaking, the system can give a locale alarm, and dial the alarm phone number automatically in terms of DTMF using phone line. Furthermore, the system can pick up the telephone from the host and receive long-distance phone key-press signals which can control home switches.