光带型可变信息标志

发布时间：2018-04-18 08:44

本文选题：LED光带 + 串口调试助手　；参考：《天津大学》2014年硕士论文

【摘要】：随着城市车辆数量的增加,交通拥堵现象越来越严重。本文阐述的光带型可变信息标志是为应对现在的交通现象,提供司机前方路面情况信息而设计的智能交通诱导标志。它是由光带部分和文字部分组成,用图形显示道路整体轮廓走向,用文字提示信息。光带部分显示的颜色是红、绿、黄三色,与之对应的是路段堵塞、畅通和拥挤三种路面信息。光带控制部分由工控机和光带显示控制器构成,采用串口传递数据,按自订通信协议通讯。工控机使用串口调试助手发送数据,采用串行方式。光带显示控制器主要由单片机和CPLD构成。单片机采用STC89C52,其主要作用是通信处理并生成显示数据。因为单片机工作频率低,数据传输需要快速移位,本文采用型号为EPM7128的CPLD来实现数据快速移位。驱动芯片选择74HC595,其功能是实现串行数据转换成并行数据输出,驱动LED显示不同颜色。文字部分同样由单片机控制,行驱动器为74LS138,八个列驱动器为74HC595,驱动显示屏显示。该电子显示屏用来显示文字提示路况信息,全屏设计显示四个汉字,采用十六块八乘八点阵显示模块来组成四个十六乘十六点阵显示模式。文字显示采用动态显示,显示方式为左移入显示方式。
[Abstract]:With the increase of the number of urban vehicles, traffic congestion is becoming more and more serious.The light band variable information sign described in this paper is an intelligent traffic guidance sign designed to deal with the current traffic phenomenon and provide information on the road conditions in front of the driver.It is composed of light band part and text part.The color of the ribbon is red, green and yellow, corresponding to three kinds of road information: road jam, smooth flow and congestion.The optical tape control part is composed of industrial control computer and optical tape display controller. Serial port is used to transmit data and communicate according to custom communication protocol.IPC uses serial debugging assistant to send data, using serial mode.The optical tape display controller is mainly composed of single chip and CPLD.Single-chip computer uses STC 89 C 52, its main function is communication processing and generating display data.Because of the low working frequency of single chip computer, the data transfer needs to be shifted quickly. In this paper, the CPLD of EPM7128 is used to realize the fast shift of data.The driver chip selects 74HC595. its function is to transform serial data into parallel data output and drive LED to display different colors.The text part is also controlled by single chip computer, the line driver is 74LS138. the eight column driver is 74HC595. the display screen is driven.The electronic display screen is used to display the information of road condition, the full-screen design displays four Chinese characters, and the display module of 16 blocks, 8 times 8 points array is used to form the display mode of four 16 times 16:00 array.Text display uses dynamic display, display mode is left-in display mode.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN873

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