程序功能为通过4*4矩阵键盘输入6位密码，单片机定时扫描键盘获得输入的6位密码，通过比较用户输入的密码和程序预置密码，如果两个密码相同，绿色发光管点亮；如果两个密码不相同，红色发光管点亮；

-Program features input by 4* 4 matrix keyboard password, SCM regularly scan the keyboard to get six password is entered, the preset password by comparing the user-entered password and procedures, if two passwords are identical, the green LEDs light　if two the password is not the same, red LED lights