【摘要】 说明了车流量检测系统的硬件设计原理图,阐述了当车辆通过时红外传感器感受到信号经过检测电路实现脉冲检测的原理,叙述了车辆计数的设计思路和软件程序的设计与实现。软件设计利用外部中断和定时器等多个中断。文中对单片机接收检测电路的脉冲序列进行了分析。系统以AT89C51作为系统核心控制单元,由8列×4行的RT12864液晶显示器显示结果。系统还配备了存储器24C256来实现对数据的存储,配备RS-232串行接口与上位机通信。文中对实时显示车流量数进行了程序设计。该方案应用于车辆检测系统中,经过验证是有效、实用的方法。更多还原

【Abstract】 Illustrated hardware circuit of flow rates of vehicles.The principle of pulse detecting was expounded when vehicles passed through infrared sensor.The design thought of vehicles counts and software program were described.External interrupt and timer interrupt were used.Analyzed pulse series of detecting circuit based on MCU.The core control unit of the whole system is AT89C51 from ATMEL Corporation.Displays the result by 8 rows 4 lines of RT12864 LCD.The system is also able to achieve the data memorizing by providing 24C256 storage,at the same time,is capable of communicating with the personal computer through the RS-232 serial interface.The program of displaying flow rates of vehicle real time was designed.This method can be used in monitoring and measuring system of vehicles.It is effective and applied method through the validation.更多还原