用C语言编写的主控芯片控制程序与EEPROM AT24C02读写程序相结合，并用Keil软件进行编译，设计了一款可以多次更改密码，具有报警功能的电子密码控制系统。-Using the C language of the master control program and EEPROM AT24C02 chip to read and write procedures are combined and compiled using Keil software, designed a password can be changed several times, with alarm function electronic code control system.