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..

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