1．开门输入密码功能，键盘输入密码（4~6位密码），格式为：#n位密码# 。

2．当有住户进入时，需要输入密码。密码输入正确显示6位字母C提示密码正确，同时打开门；密码输入错误显示6位字母E提示密码输入错误；连续输入密码错误3次，键盘锁定1分钟，此时不能输入。

3. 访客呼叫住户，输入住户房号，格式为：*3位房号*，该住户门铃鸣响。

1．设计基本要求

（1）设计密码数字显示、键盘输入及单片机最小系统。

（2）住户输入正确密码，电动机运转开门。

（3）输入密码错误达到三次，锁定1分钟。

（4）呼叫住户。

-1. Open the door to enter the password function, the keyboard to enter the password (4 to 6 password), the format is:# n-bit password#. 2. When residents enter, you need to enter a password. Enter the correct password displayed six letters C prompt the password is correct, and opened the door　enter the wrong password displays six letters E prompt for password input error　continuous input the wrong password three times, the keypad is locked one minute, then you can not enter. 3 visitors call households, households enter the room number, the format is:* 3* room number, the household doorbell ringing. 1. The basic design requirements (1) design code number display, keyboard input and smallest single-chip systems. (2) Households enter the correct password, the door motor running. (3) enter the wrong password three times, locking one minute. (4) call households.