说明：  no intro
((1) the functional connectivity by 8279 4* 4 keyboard and 8-bit LED digital display tubes, to achieve password keyboard input, digital output, and have a simple function keys. (2) open the door using the stepper motor simulation process starts when the password is entered correctly, the external interrupt is received when to stop. (3) has the voice function button. (4) password error with alert and warning lights, and three errors to achieve lock function. (5) the overall system is realized through INTR0 hard reset. (6) LCD realized by controlling the information RT12864HZ tips. (7) by modifying the assembler subroutine itself in password to change your password purposes.)