设计本课题时构思了两种方案：一种是用以AT89C2051为核心的单片机控制方案；另一种是用以74LS112双JK触发器构成的数字逻辑电路控制方案。考虑到单片机方案原理复杂，而且调试较为繁琐，所以本文采用后一种方案。-When the subject of the design concept of the two programs: one is for the AT89C2051 MCU as the core control program　the other is for the 74LS112 dual JK flip-flop circuit composed of digital logic control program. Taking into account the principles of complex single-chip program, and debug more cumbersome, so this paper, the latter program.