由单片机来控制锁的打开与闭合，由HD7279来管理器键盘及显示；密码从键盘输入，用单片机控制7279显示当前锁的状态信息及报警。密码由4-6位数字组成，当输入密码时，有相应按键提示，正确时，单片机发出开锁信号，通过光耦控制，打开密码锁。为了避免密码锁被多次试探而解密，输入三次不符报警，此时单片机发出报警信号，经过放大发出报警声音。同时密码输入正确时可以修改密码，此时指示灯亮-Password is composed of 4 to 6 digits, when the input password, have corresponding button prompt, correct, MCU signal lock, by decoupling control of light, open a combination lock.In order to avoid the combination lock was tempted many times and decryption, input three discrepancy report to the police, the single chip microcomputer signal alarm, amplified alarm sounds.Password can modify the correct password at the same time, the indicator