摘要
设计了一种自动拨号报警电路系统。该系统通过MT8888芯片收发DTMF信号。用AT89C51单片机控制整个电路系统,通过电话线实现自动拨号报警。
An auto-dial alarm circuit,which can receive and transmit DTMF signal through MT8888,is designed.It can control the whole circuit system by using AT89C51 single chip microcomputer,and the function of auto-dial alarm via line is realized.
出处
《电子元器件应用》
2004年第9期22-24,30,共4页
Electronic Component & Device Applications
关键词
单片机
双音多频
MT8888
single-chip microcomputer
double tone multiple frequency
MT8888
