自行车里程速度计设计.doc

郑州航空工业管理学院毕业论文(设计) 201 1届电气工程及其自动化专业 10111186 班级题目自行车里程速度计设计姓名蓝楚楚学号 10111186 指导教师职称副教授二О一一年五月十七日内容摘要本论文基于自行车智能设备的种类,结合当前发展趋势,设计一个以单片机为核心, 霍尔传感器测量转数, LED 显示数据的自行车里程速度计的硬件设计,实现人们可以随时掌控自行车当前里程和速度。整个系统主要是利用霍尔元件实时的检测发出脉冲信号,然后将其传入到单片机中,经单片机的测量计算将所得数据保存到存储器中。本设计采用 AT24C02 存储器, 可以实现系统在断电的情况下保存里程数据。单片机得出的数据再由 1602 液晶显示器进行显示,同时为了让设计更加智能,本设计还将采用 HC-SR04 超声波测距模块进行实时测量,每隔一段时间发出超声波脉冲,超声波遇到前方障碍物将返回,从而可以计算超声波从发射到接收的来回时间,经过计算便可得到测量距离。一旦测得距离小于设定的安全距离系统将会产生声光报警信号提醒用户。本设计硬件电路主要包括 AT89C51 单片机最小系统电路、 A44E 霍尔传感器检测电路、 HC-SR04 超声波测距电路、电源电路以及 LCD1602 液晶显示电路等。软件部分采用汇编语言进行编程,由于本设计侧重于硬件电路的设计,软件部分稍加提到,不作重点分析。关键词单片机;里程速度;霍尔传感器;超声波测距; 1602 液晶显示 The design of the bicycle mileage speedometer By:Dong Dongdong Supervisor:Professor,Cui Jianfeng Abstract The kinds of intelligent device based on bicycle, this bined with the current development trend, design a single-chip puter as the core, hall sensor revolution, LED display data of bicycle mileage speedometer hardware design, to realize people can control current bicycle mileage and speed at any time. The whole system is mainly the use of hall element real-time detection signal pulse, then passed to the single chip puter, the single chip puter measuring calculation to save the data in the memory. This design adopts the AT24C02 memory, can realize system under the condition of the power save mileage data. Single chip puter the data again by 1602 LCD display, at the same time in order to make a design more intelligent, this design will also be the HC - SR04 ultrasonic ranging module for real-time measurement, ultrasonic pulse every once ina while, ultrasonic encounter obstacles ahead will return, in order to calculate ultrasonic from transmitting to receiving time back and forth, calculate the measured distance can be got. Once the measured distance is less than the safe distance of setting system will alert users to produce sound and light alarm signal. The design of hardware circuit is mainly including AT89C51 single chip puter minimum system circuit, A