基于AVR单片机的LED显示屏的灰度设计与实现

Design of Gray Scale LED Screen Display System Based on AVR Microcontroller

设计了一种基于AVR单片机的LED灰度显示屏系统,该系统采用PC机—主控单元—显示子模块3级模式,其中PC机用于更新信息数据,显示子模块用于灰度显示控制,主控单元是PC机与显示子模块的桥梁。利用AVR单片机自身的内部数据存储能力,结合其软件扫描控制能力及高速运算能力,通过调节驱动LED的脉冲电流的占空比的方式解决了LED显示屏的灰度显示控制。给出了系统的软、硬件实现方案。

This paper introduces design of gray scale LED screen display system based on AVR microcontroller. The system is composed of PC, main control unit and display module. The communication data is renovated by PC,gray display is controlled by display module,PC and display module are joined by main control unit. With the RAM and ROM of AVR microcontroller,with AVR＇s high speed operation performance, through adjusting pulse duration ratio of I.ED＇s electric current, this system solved the display control of the gray scale LED screen. The designs of hardware and software are presented.