First, the system initialization, the display circuit work shows Your Password ..., prompts the user to enter a password, the program calls the keyboard scanning procedures, confirm whether a key is pressed, if a key is pressed, the input numbers into the AT89C51 microcontroller and storage compared to the value, and also refresh the LCD output data, if at this time press the E key, the system will perform cleanup last numeric keys to enter password if six is ​ ​ completed, and press the A key, the program will enter the six password stored value comparison, determine whether the correct password if the password is correct, unlock successful if the wrong password, the LCD will display ERROR!. Output per input a number or a result, the beeper will sound once.

程序
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