目录摘要.....................................................................................1、前言..................................................................................12、正文..................................................................................22.1设计方案论证....................................................................22.1.1方案一....................................................................32.1.2方案二....................................................................32.1.3方案选择..................................................................42.2计算部分.........................................................................42.3设计部分.........................................................................52.3.1硬件设计..................................................................52.3.1.1总体设计图....................................................52.3.1.251单片机介绍...................................................52.3.1.3双电压比较集成器LM393..............................................................................................72.3.2软件设计..................................................................82.3.2.1protues软件介绍..................................................82.3.2.2主程序.......................................................92.3.2.3系统工作原理..................................................102.3.3元件清单..................................................................112.4样件或试件的各种实验及测试情况................................................112.5方案的校验......................................................................133、结论.................................................................................144、致谢.................................................................................145、参考文献............................................................................15附录....................................................................................16附A源程序...................................................................