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 functions through the 4* 4 matrix keyboard 6 passwords, regularly scan the keyboard microcontroller access to the password input 6, by comparing the user input password and the program preset password, if the two passwords the same, the green LED light　if two passwords are different, the red LED light