精选优质文档-倾情为你奉上二线制楼宇对讲系统硬件部分摘 要本文介绍了二线制楼宇对讲系统的设计,整个系统分为三大部分:室外主机、楼层译码器、室内分机。本设计中采用AT89S51为控制中心并模拟编码芯片HT12E的编码方式对房间号码进行编码,再通过楼层译码器HT12D解码获得相应的楼层地址和分机地址,选通该分机实现主机与分机的对话功能,方便室主通过对话识别来客的身份。同时室主可以通过分机为来访客人打开门锁。关键字 楼宇对讲;二线制;单片机模拟HT12E编码;HT12D译码;对话系统Two-wire Building Talkback SystemHardwarePartAbstractThe design of two-wire talkback system in the building is introducted in this paperThe overall system is divided into three major parts:outdoor main telephon,floor decoder