用STC单片机，实现4个数字4位密码锁的功能，并显示在数码管上。具体如下K1,K2,K3,K4,键分别代表数字1，2，3，4，K5为确认键，如果输入用户存放的正确密码，则单片机上的LED实行循环亮灭功能，如输错了3次,LED等则全亮。-

Use of STC to achieve four digits 4 lock function, and displayed on a digital pipe. Follows K1, K2, K3, K4, representing key figures 1,2,3,4, K5 is OK button, if you enter the correct password for the user is stored, the LED on the implementation of SCM light off circulation features, such as mistyped 3, LED, etc. are all bright.