电子测速仪_毕业设计.doc

摘 要 随着居民生活水平的不断提高，自行车不再仅仅是普通的运输、代步的工具，而是成为人们娱乐、休闲、锻炼的首选。自行车能够满足人们最基本的需求，让人们能清楚地知道当前的速度、里程、、等物理量。本论文主要阐述一种基于霍尔元件的自行车的设计。以 AT89C52 单片机为核心，A44E 霍尔传感器测转数，实现对自行车里程、速度、、的测量统计，采用 24C02 实现在系统掉电的时候保存里程信息，并能将自行车的里程数及速度用LED实时显示。文章详细介绍了自行车的硬件电路和软件设计。硬件部分利用霍尔元件将自行车每转一圈的脉冲数传入单片机系统，然后单片机系统将信号经过处理送显示。软件部分用汇编语言进行编程，采用模块化设计思想。该系统硬件电路简单，子程序具有通用性，完全符合设计要求。 关键词：里程/速度；霍尔元件；单片机；LED显示ABSTRACT With the developing of people’s life, the bicycle is not only the universal tool of transportation and substitute for walking, but becomes the first choice of entertainment and exercising. The bicycle speedometer can fulfill the basic need of people’s life, so that they can learn the speed、 the mileage 、Time、temperature of the bicycle. In this paper, the bicycle speedometer design based on the Hall element is elaborated. By AT89C52 as kernel, using A44E Hall element to measure revolution, the measure and statistic are achieved. The range information is saved by 24C02 when the power is off, the bicycle speed can be displayed on LED. In this article, the hardware circuit and software design of bicycle speedometer instrument are introduced in detail. About the hardware, the pulse number is transmitted of one cycle of the bicycle into Single Chip Microcomputer system. Then the signal processed by Single Chip Microcomputer system is sent to display scream. About the software, in assemble language; the program is designed in the mode of modules. The system has simple hardware, common sub-program, and meets the demand of design. KEY WORDS: Mileage / speed; Time；temperature；Hall element; Single chip microcomputer; LED 目录 一、产品设计背景 2 二、产品功能简介 2 三、系统硬件设计 3 3.1系统框图 3 3.2单片机AT89C52 4 3.3 时钟芯片DS12887 5 3.4 温度传感器DS1820 6 3.5 EE-SX671型光电传感器 7 3.6 液晶显示 8 3.7 电源 9 3.8 与微机通信 9 四、MCU软件设计 10 五、上位机软件bike V1.0设计 10 5.1 开机画面 10 5.2 车型选择 11 5.3 采样频率设定 11 5.4 主测量界面 11 5.5?数据传输菜单 11 5.6 ?时间设定画面 12 5.7???结束画面 12 六、结语 12 七、附录 13 附录1 电路 13 附录2 源程序 14 ? ? 多功能自行车测速仪 ?一、产品设计背景 随着人们生活水平的逐渐提高，人们对于生活质量的要求也日益增加，尤其是对健身的要求。自行车在中国普遍作为