【摘要】 本设计的基本原理为:对方来电振铃后,电话自动接通,然后译码电路将对方所拨双音频号码译为:BCD码,再经AT89C51单片机解码,从而控制家用电器。本设计分为硬件和软件两大部分。硬件部分主要由电话机线路、译码电路、解码电路、控制电路等几部分组成。软件部分主要通过汇编语言编程,控制单片机AT89C51的P0、P1、P2口的高低电位从而控制家用电器。本设计集成化程度高,性能优越,便于调试使用。更多还原

【Abstract】 The design is based on the following basic principles: when the call from the other side rings the phone, it will put on automat- ically; then the decoding circuit deciphers the DTMF into BCD code which is afterwards decoded by single- chip microcomputer AT89C51, Thus it remote controls the household appliances. The design is divided into two parts: hardware and software. The hardware is made up of the telephone circuit, decoding circuit and controlling circuit. The software remote the household appliances by applying assembly language to program and then control PO,P1,P2 interface of AT89C51. The level of integration and performance are so superior that it is very convenient to debug and use.更多还原