摘 要:伴随着科技的进步,LED点阵显示屏作为一种新兴的显示器件走进我们的视野,它是由多个独立的LED发光二极管封装而成。通过LED点阵显示屏可以显示数字、符号以及文字,通常用在广告牌,指示牌,公告牌上。本设计是一种基于STC89C51单片机的16*16点阵显示屏,STC89C51单片机是整个电路的核心控制器件,设计中使用4块8*8单红色点阵屏来组成16*16点阵屏,通过74HC154译码器来控制点阵的行方向的控制,而列方向采用两片八位串行输入并行输出的74HC595级联来控制,通过快速的动态刷新来显示用户需要的内容,以达到动态显示的目的。本文重点介绍了LED点阵屏硬件设计的思路、硬件电路各个部分的功能及原理、以及相关软件的程序设计。78715
毕业论文关键词:点阵,单片机,译码器,动态扫描
Abstract:With advances in technology, LED dot matrix display as a display device into our new vision, it is more independent of the LED light emitting diode packages。 LED dot matrix display can show by numbers, symbols and text, often used in advertising, signs, bulletin boards。The design is based on STC89C51 Lee microcontroller 16 * 16 dot matrix display design, which is responsible for the entire chip STC89C51 overall control system design using four 8 * 8 to form a single red dot-matrix screen 16 * 16 points front panel, through the 74HC154 decoder to control the direction of the control line dot matrix, and the column direction is controlled by two serial input parallel output of the 74HC595 eight cascaded to control, through a fast dynamic refresh to show that we need content, has reached the dynamic display purposes。Which focuses on the LED dot matrix display hardware design ideas, the hardware circuit functions of various parts and principles corresponding software program design, and detailed workflow and instructions for use。
Keywords: dot matrix, single-chip, decoder, dynamic scan
目 录
1 引言 3
1。1 设计背景 3
1。2 设计要求 4
2 总体设计方案 4
2。1 电路组成 4
2。2 显示原理 5
2。3 设计框图 5
3 系统硬件电路设计 5
3。1 主控电路 5
3。2 LED显示驱动电路 12
3。3 LED点阵显示电路 13
3。4设计电路原理图 17
4 系统软件设计 18
4。1 软件介绍 18
4。2 系统程序流程图 18
4。3 程序设计方案 19
5 系统仿真与测试 25
5。1 单元模块电路测试 25
5。2 系统整体功能测试 25
6 系统组装与调试 26
6。2 调试 26
6。2 实物图 27
总结 28
参考文献 29
致谢 30
附录A 31
附录B 37
1 引言
1。1 设计背景