本文介绍了一种以单片机AT89C51为主控制器和双音多频解码电路芯片MT8880为核心,通过电话线路实现对家用电器的远程多路智能控制系统。该系统实用、功能灵活多样,可以对被遥控对象的状态进行查询以及控制,可以广泛地应用于家用电器或者其他场所的各种控制设备。 This article introduces a remote control system of multi-home appliances based on AT89C51 microcontroller and dual-tone multi-frequency decoding circuit chip MT8880 as the core, through the telephone line. The system is practical, versatile and flexible. It can query and control the status of remote objects and can be widely applied to various control devices in home appliances or other places.