名称：门禁模拟

模拟现实中门禁系统，可以输入密码进入也可以呼叫住户，再由住户按下开门按键

实现改密码功能，密码保存在24c02中能保证掉电不丢失密码。八个LED灯分别代表

8家住户，其中开门按键为共用，还带有忘记密码恢复按钮，模拟恢复出厂设置，

显示部分为LCD1602。程序共分为3种模式，分别为 等待输入 密码修改 呼叫住户

3种模式，其中等待输入是主要状态，所以在进入密码修改 呼叫住户模式后如果

长时间没有操作能自己切换到等待输入模式。



等待输入模式：当密码长度不为6位，显示长度错，当密码长度为6位但不正确则提示密码输入错误，错误提示信息将显示大概2S后消失，密码正确则开门灯点亮，关门灯熄灭，液晶屏显示门打开。并自动计时10S左右自动关门，也可以手动按关门键。



密码修改模式：进入密码修改模式提示输入旧密码，密码正确后输入新密码，这时会将新密码写入24c02保存。如果使用者长时间未做操作将切换回等

待输入模式。

呼叫住户模式：提示输入住户门牌，如果输入门牌存在，则点亮相应的灯，如果用户按开门键，熄灭灯，显示提示门打开，门在10S时间左右关闭，如果使用者长时间未做操作将切换回等待输入模式。-Name: Access Analog

Simulating real access control system, you can also enter a password to enter the call households, again by pressing the open button households

Implement change password function, the password stored in the 24c02 can guarantee non-volatile password. Eight LED lights represent

8 households, which opened the door keys are shared, but also with forgotten password recovery button, analog restore factory settings,

Display part LCD1602. Program is divided into three modes, namely, waiting for a password to modify call households

3 modes, which is the main input wait state, so call households entering the password change mode if

Their long time operation can be switched to the standby input mode.



Waiting for input mode: When the password length is not 6, showing the wrong length, when the password length is 6 but is incorrect then prompt enter the wrong password, an error message will be displayed 2S probably disappear after a correct password to open the door lig