摘要
文中所设计自动打铃系统由两部分组成:主控制中心和响铃终端。主控制中心是整个系统的中心模块,该模块以单片机AT89C51为核心,包括控制电路、显示电路。响铃终端由蜂鸣器、三极管、限流电阻、电压源和接地线构成。对该设备输入一定频率的高低电平便能产生铃声。
The automatic bell system consists of two parts： the main control center and the bell terminal. The main control center is the center modules of the entire system. This module take SCM AT89C51 as the core, including the con- trol circuit , display circuit. The bell terminal is consisted of the buzzer, transistor, current limiting resistors, voltage sources, and grounding lines. The device input of a certain frequency high and low level will be able to produce ringtones.
出处
《通信电源技术》
2014年第5期19-21,共3页
Telecom Power Technology
关键词
单片机
主控中心
响铃终端
SCM
main control center
bell terminal
