文档介绍：序号:
电子实训
题目新型车速监控装置
学生 xxxxxxxx
学院 xxxxx 专业班级 xxxxx
校内指导教师 xxxxxxx 专业技术职务 xxxxxx
校外指导老师专业技术职务
二○一三年六月
新型车速监控装置的设计
摘要:本文设计一款用于实时监控车辆行驶过程中速度变化的装置。系统以STC89C51单片机为控制核心,ADC0809芯片将检测到的模拟信号转化成数字信号,74LS138是为了将三个端口转为八位输出,74HC245增强负载输出,OP07构成的反相器用来将采集到的负值转为正值,拨码开关作为系统输入设备用来选择对应的程序,NOKIA5110液晶显示器用于系统参数显示。
该车速监控装置是根据预先设置的速度(电压值)范围,对给定的电压值进行检测。实现以下功能:①实时动态超速报警:系统运行时,能实时监测限速范围,一旦车辆超出该范围,即发出声光报警。②实时动态限速:系统运行时,能实时监测限速范围(LCD显示),并自动根据限速范围限制车行速度(通过控制电压实现)。③动感显示:用8只发光管排成圆形,依次点亮,以显示车辆前进、倒退和行驶速度。点亮时间与行驶速度成反比。前进时,发光管顺时针点亮;倒退时,发光管逆时针点亮。④实时监测并数字显示车辆行驶速度和限速范围(LCD显示)。⑤三档功能转换:0挡-关闭功能①和②;1档-开启功能①;2档-开启功能②。
实验结果表明,该设计具有成本低、可靠性高、测量精度高、安装调试方便等特征,非常适用于厂家提高车辆速度智能化控制程度,提高市场竞争力,具有较好的应用前景。
关键字:车速;实时监控;STC89C51;LCD显示;声光报警
The Design of the New Speed Monitoring Device
Abstract: In this paper, the software of real-time monitoring speed changes of vehicle was designed. This control system takes the STC12C89C51 puter as its core. We use the ADC0809 chip to detect the analog signals into digital signals, use 74LS138 to turn the three outputs to eight, use 74HC245 to enhance the output of the load. Meanwhile, the inverter made up of OP07 is able to turn negative to positive. We also use dial-code switch as the input device to select the corresponding program system, and NOKIA5110 LCD display for system parameters.
The device is designed for a given voltage for testing, according to a preset speed range (voltage). Function as follows: ①Real-time dynamic overspeed alarm:When the system is running, it can real-time monitor the speed limit. Once the vehicle is beyond the scope, it will send out sound and light alarm. ②Real-time dynamic speed limit:When the system is running, it can real-time monitor the speed limit range (LCD display), and automatically limit the car speed range (by controlling the voltage), according to the speed limit.③Light show:We use eight light-emitting tube arranged in round, light in order, to display the vehicle forward, backward and moving Speed. Light time