文档介绍：长春光华学院毕业设计(论文) 出租车计价器系统应用姓名教学院电子信息学院专业电气工程及其自动化班级电气 11404 指导教师序号(学号): 041140431 2014 年 07 月 08 日毕业设计(论文) [摘要]随着社会的发展,人们的物质生活有了很大的提高,在日常的出行中, 出租车这种代步工具由于它停靠方便,并且价格适中,越来越受到广大民众的青睐。而计价器是连接出租车的经营者和乘坐出租车的消费者之间的纽带,它不可或缺。随着出租车事业的蓬勃发展,对计价器的要求也越来越高,从改革开放初期的全部采用机械齿轮结构,只能完成简单的计程功能,可以说早起的计价器就是一个里程表。再到第二代计价器,它采用了手摇计算机与机械结构相结合的方式,实现了半机械半电子化,此时它在计程的同时还可以完成计价的工作。而大规模的集成电路的发展又产生了第三代计价器,也是全电子化的计价器,它的功能也在不断的完善。当单片机的出现并应用于计价器后,现代出租车计价器的模型也就基本具备了。它可以完成计程,计价,显示等基本工作。单片机以及外围芯片的不断发展促进了计价器的发展,使得计价器已经具有打票发音提示和按时间自助变单价的功能。本电路以 89S51 单片机为中心,附加 A44E 霍尔传感器测距,实现对出租车计价统计,采用 AT24C02 实现在系统掉电的时候保存单价和系统时间等信息,输出采用 8段数码显示管。本电路设计的计价器不但能实现基本的计价,而且还能根据白天、黑夜、中途等待来调节单价,同时在不计价的时候还能作为时钟为司机同志提供方便。[关键词]89S51 单片机 A44E 霍尔传感器断电保存 8段数码显示管[Abstract] With the development ofsociety, people's material life has been greatly improved, inthe daily travel, taxi transport because it stops this convenient, and affordable, more and more bythe vast number ofpeople ofall ages. While the meter isthe link between the operator connected taxi and the taxi consumers, itisindispensable. With the rapid development ofthe taxi industry, the taximeter requirements are increasingly high, from the use ofmechanical gear structure atthe beginning ofthe reform and open, plete asimple log function, can besaid that the early meter isaspeedometer. And then tothe second generation ofthe meter, which uses acombination puter and mechanical way, the half ofthe mechanical electronic, itinthe taxi can plete the valuation work. Large scale integrated circuit development and production ofthe third generation ofthe meter, but also the whole electronic meter, its functions are continuous improvement. When the emergence ofSCM and its application tothe meter, modern Taximeter model isbasically. plete ataxi, valuation, display the basic work. Development ofsingle chip puter and peripheral chip has promoted development ofthe meter, the meter has aticket pronunciation tips and according tothe time variable cost functions of self. 89S51 SCM tothe circuit asthe c