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ID:16191764
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时间:2018-08-08
《《基于pstn的家用电器远程控制系统设计方案》》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、基于PSTN的家用电器远程控制系统设计方案 1系统工作原理 当需要遥控家用电器时,拨打相应的座机电话号码,振铃检测电路检测铃流信号。如果有人接听电话或振铃次数少于5次,对程控电话的使用不造成影响;当振铃次数达到5次后(次数可以通过软件任意设定),单片机启动语音提示电路并发出提示音,询问是否进入家电控制模式。按“O”键否,挂机退出,按“1”键是,摘挂机电路自动摘机进入控制状态并将摘机信号输入到单片机中。单片机接收到摘机信号后,启动语音提示电路发出提示音,提示操作者输入密码(系统支持在线修改密码)。输入的密码经DTMF接收,转换
2、成二进制数并与事先存储在单片机中的密码比较。如果不相符,则语音提示密码错误,可再次重新输入,若三次密码错误则发提示音并自动挂机;如果密码相符,则语音提示选择控制通道(按键l、2分别表示1、2号通道)。通道选择后,按下“1”键表示开启该路电器,并有语音提示“该路电器已经开启”;按下“O”键表示关断该路电器,有提示音“该路电器已经关闭”;再按“O”键则可挂机退出。若超时则自动挂机(超时时间由软件设定)。 2系统组成本系统由5部分组成,即振铃检测电路、模拟摘机电路、DTMF解码电路、通道控制电路和语音提示电路。其中振铃检测和解码均
3、采用外部中断来实现,系统组成原理框图如图1所示。3.3.2电路设计 由MT8870组成的解码电路如图4所示。Opinionsandsuggestionsontheparty'smasslineeducationalpracticeAccordingtothecentralandprovincial,municipalunifieddeployment,accordingtomunicipalPartycommittee"aboutcarryingouttheparty'smasslineeducationalpractice
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