基于有线电话网的家电控制器设计

摘要

本文介绍的是一种基于AT89C2051单片机的远程电话控制系统。本系统主要包括以下几个软硬件功能模块：铃流检测电路、摘挂机控制电路、家电控制电路、双音多频解码电路以及用汇编语言编写的信号音计数和密码校验模块。该系统是以AT89C2051为核心，利用现有的个人通信终端，实现基于PLMN（路基移动通信网）和PSTN（公用电话交换网）的电话远程控制系统。电话远程控制系统（ITRCS），CCITT（国际电报电话咨询委员会）以及我国标准共同规定的部分标准程控交换信令（DTMF双音多频信号，振铃信号，回铃音信号等）作为系统控制命令，以PLMN与PSTN通信网作为传输介质，使用者可以在远端利用固定电话或移动电话发送DTMF双音多频信号，实现对近端电器设备的实时远程控制。该电话远程控制不需进行专门布线，不占用无线电频率资源，从而避免电磁污染；且通过嵌入式的智能语音提示，突出的语音提示功能和密码控制系统，可使操作者根据各种提示音及时了解受控对象的有关信息。用户还可以查询其状态，提供密码处理功能，只有输入正确密码才能控制家电，从而提高了安全性。该系统设计使用，功能灵活多样，可靠性高，操作方便，可以广泛的应用于家庭或者其他场所的智能控制。

关键词：AT89C2051；远程电话控制；DTMF；智能控制

Abstract

The article designed the remote telephone control system which based on microcontroller AT89C2051.This system mainly includes the following several hardware and software function modules：Ringing detection circuit、Pick hang machine control circuit、Household appliances control circuit、DTMF circuit and Signal counting、Password validation program. Basing on the PLMN and PSTN, the system which uses the controller Single-chip microcomputer AT89C2051 realizes long-distance control household appliances. The telephone control system (ITRCS) which uses the telephone net convert and voice information receives DTMF code from the telephone net, and interpret the code, the core controller controls the state of household appliances responded to the interpretation. Long distance control of telephone do not require special wires distribution and does not take up wireless frequency resources. Electro magnetic pollution can thus be avoided. The designing of a system of long-distance control based on sound processing technology and DTMF decoding technology, this system realizes its control of household electrical appliances through telephone networks and so realizes the intelligently control of them in residence. The embedded and intelligent sound indication, its outstanding sound function of prompt and its code control system enable the operators to timely obtain the relative information of the controlled objects through indicated sounds. The system can use telephone to control many household electrical appliances in long distances through uttering sound commands and provides the code safeguard function. Only through inputting the correct password to control them, the user can control the condition of household electrical equipment, so the system security can be improved. This system is practical, and the function is flexible, and the operation is convenient with high reliability, which can be used extensive in carious kinds of control equipment to home and other field.

Key words: AT89C2051;Telephone remot control; DTMF; Intelligent control