文档介绍：摘要
车速里程表广泛应用于各种机车,传统的机械式车速里程表虽然稳定可靠,但功能单一,易受磨损。随着电子技术的迅猛发展,电子式车速里程表得以广泛应用,现在很多轿车仪表已经开始使用电子车速里程表。本设计介绍一种基于单片机的智能车速里程表,该表是一种数字式仪表,不仅可以实时显示汽车的车速及行驶的总里程,也可以显示一段时间的阶段里程,还可以显示温度,以及实现超速报警功能。它的实现方式是:在车轮上安装一个很小的强力磁钢,在其侧正对面安装霍尔传感器A44e,在车辆行驶过程中,车轮每转一圈,霍尔传感器便相应产生一次高低电平变化,通过单片机记录处理这种电平变化的量,便知道一定时间车轮的转数,通过设定车轮的周长,再由单片机处理这些数据便可知道汽车的车速及里程了,并由LED显示器显示出来。由于单片机每一秒钟处理一次信号量,并将相关的里程信息存储在非易失性EEPROM中,所以车速及里程信息是实时更新的。
关键词:STC89C52RE单片机;A44E霍尔传感器;DS18B20温度传感器;AT24C02存储器;LED
Abstract
The speedometer is widely used in a variety of otives,the traditional mechanical speedometer stable and reliable ,but function of a single ,vulnerable to the rapid development of electronic technology ,electronic design introduces a micro-controller-based smart speedometer,the table is a digital meter,the total mileage of the vehicle speed and driving can not only real-time display can also display the speed alarm function .Its implementation is:install a small strong on the wheels,installed in the side opposite the Hall sensor A44E,each turn in process of vehicle ,Hall sensor will produce a level of power corresponding level chang ,by micro-controller record deal with this level the amount of change ,we will know the number of revolutions of the wheel of a certain period of time ,and then processed by the micro-controller by setting the wheel circumference ,these data will know the’s speed and mileage by LED display .Micro-controller every minute of processing time semaphores and related mileage information is stored in nonvolatile EEPROM,so the speed and mileage information is updated in real time.
Keywords:STC89C52RE micro-controller;the A44E hall sensor;DS18B20 temperature sensor;AT24C02;LED
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Abstract II
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