单片机实现的密码锁，功能如下：1:用4×4矩阵键盘组成0－9数字键及确认键和删除键。

2:可以自行设定或删除8位密码，能够掉电保存。

3:用5位数码管组成显示电路提示信息，当输入密码时，只显示“8.”，当密码位数输入完毕按下确认键时，对输入的密码与设定的密码进行比较，若密码正确，则门开，此处用绿色led发光二极管亮一秒钟做为提示，若密码不正确，禁止按键输入3秒，同时用红色led发光二极管亮三秒钟做为提示；若在3秒之内仍有按键按下，则禁止按键输入3秒被重新禁止。

-MCU password lock function is as follows: 1: 44 matrix keyboard 0-9 keys and the Enter key and the delete key. 2: You can set or delete the password of 8 can power down to save. 3: five digital tube display circuit message, enter a password, only 8 when the password-digit input is complete press the Enter key, enter the password and the password to compare, if password is correct, then the door opened here with a green led light-emitting diode bright for a second as a prompt if the password is incorrect, the Prohibition of the key input for 3 seconds, the red led LED lights for three seconds as the prompt　in 3 seconds there are still button is pressed, no key input to three seconds to re-ban.