基于单片机的出租车计费器设计和实现

Design and Implement of Taximeter System Based on SCM

本文设计的出租车计费系统是一个智能化仪表,它的应用系统硬件配置包括主机80C51、MAX7219、DS1302、4位LED显示管,霍尔开关传感器测速装置。其人机对话、每公里单价、总里程价格、显示时间等功能完全可由单片机应用系统实现。它的工作原理是经由霍尔传感器检测的脉冲信号送入80C51单片机P3口的P3.2引脚,引起中断,根据脉冲个数计算出总里程和价格,送入显示器显示。另外,利用键盘输入里程,模拟计算里程费用,另外可设定或更改起步价,每公里单价等。

The taximeter system is an intelligent instrument and its systematic application hardware includes MAX7219、DS1302、80C51、and LED and sensor.Its function which contains such as man-machine dialogue、 setting price for each mile、total fare、displaying the time etc can be achieved by Single Chip Microcomputer（SCM）.Its working principle is achieved by the 80C51 SCM by means of pulse signal detected by sensor.Pulse signal is put into the 80C51 P3.2 port of pin P3,causing interruption.According to the number of the pulse signal and the procedures which was set value,80C51 SCM figure out the total mileage and price,then display it.In addition,we can use the keyboard inputting mileage;simulate figuring out the fare,another changing other value such as initial price and unit price per mile etc.