基于单片机自动校时打铃控制系统设计

Design of Automatic Time Correction Bell Control System Based on Single Chip Microcomputer

针对校园传统打铃控制器精度不高,存在走时误差、打铃时间不同步等问题,提出了以单片机为核心,以DS1302为实时时钟的打铃控制系统设计,采用NE567音频解码电路获取中央人民广播电台的整点报时信号,对打铃控制系统时间进行校时,消除时间累积误差,使整个校园打铃系统准确同步,无需人工校时。打铃控制器设有自动和手动打铃模式,设置信息存入单片机内部EEPROM中,掉电后信息不丢失。

In order to solve the problems such as imprecision, time error, non-synchronous belling in the traditional campus bell controller, a design which uses DS1302 as the real time clock is proposed. This design adopts the NE567 audio decoding circuit to get the whole point of time signal from People＇s Central Broadcasting Station. It then corrects time to eliminate errors so that the entire campus bell system achieves accurate synchronization, which needs no artificial time correction. The bell controller is designed in two modes： automatic and manual. The setting information is stored in the internal EEPROM of the microcomputer and the loss of information is eliminated even when power failure occurs.