说明：  本课题要求在研究PC机键盘通信协议的基础上，设计一个89C51单片机为核心的包含常用键的标准PC小键盘，并且带有液晶显示屏LCD，使得键盘除能用于各类PC机外，还能进行一些相关字符或参数显示，并且具有体积小巧、便于布放、灵活多用等特点。这样可以形成一个标准实用的应用产品，使系统既能做PC键盘，又能直接进行一些现场操作控制及相关显示，同时还能做其它功能扩充，如现场温度监测、语音播报等。
(Requirements of this subject in the study PC-keyboard communication protocol based on the design of a single-chip microcomputer 89C51 as the core contains the commonly used standard PC key keypad and a LCD screen LCD, make the keyboard can be used in addition to all types of PC- , but also a number of related characters or parameter display, and has small, easy deployment, flexible multi-purpose and so on. This will form a standard of practical applications, the system can make PC keyboard, while a number of direct operational control of the scene and show, while other functions to do the expansion, such as the scene temperature monitoring, voice broadcast, etc..)