ABSTRACT摘要PAGE\*MERGEFORMAT42PAGE\*MERGEFORMATIII摘要计算机技术的飞速发展和提高，把我们带入了崭新的时代，现在，计算机的应用已经深入到千家万户。单片微型计算机是制作在一块集成电路芯片上的计算机，简称单片机。单片机在现在社会有着广泛的应用，小到人们的日常电子用品，大到航天飞机、宇宙飞船，上面都有单片机的广泛应用。单片机具有体积小、功能强大、低功耗、应用广泛等特点。以AT公司的芯片AT89C51单片机来实现流水灯的设计。本系统由单片机控制，I/O口接LED的负极，而LED的正极则直接与5V电源相连。通过I/O口输出的低电平点亮LED灯。因此可以通过控制单片机的I/O口的电平高低以达到控制LED，从而实现不同花样的流水灯的目的。关键词：LED，单片机，高低电平变化ABSTRACTABSTRACTTherapiddevelopmentofcomputertechnologyandimproving,bringustothenewera,now,theapplicationofcomputerhasbeendeepintothethousands.Singlechipmicrocomputerismadeonanintegratedcircuitchipcomputer,hereinafterreferredtoassinglechipmicrocomputer.SCMhasbeenwidelyusedinthepresentsociety,smalltoPeople'sDailyelectronicproducts,bigtoaerospaceaircraft,spacecraft,abovehasthewideapplicationofsingle-chipmicrocomputer.SCMhassmallvolume,powerfulfunction,lowpowerconsumption,wideapplication,etc.ATthecompany'schipAT89C51single-chipmicrocomputertorealizethewaterlampdesign.Thissystemcontrolledbysinglechipmicrocomputer,I/OportsconnecttheLEDthecathode,andLEDtheanodeisdirectlyconnectedto5Vpowersupply.ThroughtheI/Oportoutputlowlevellightleds.SoyoucansinglechipmicrocomputercontrolthroughtheI/OportstocontrolLED,thelevelofhighandlowsoastorealizethepurposeofthedifferentpatternofflowingwaterlight.Keywords:LED,MCU,HighandLowoutputleve目录目录目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc417808559"第1章引言PAGEREF_Toc417808559\h1HYPERLINK\l"_Toc417808560"1.1研究背景及意义PAGEREF_Toc417808560\h1HYPERLINK\l"_Toc417808561"1.2国内外研究现状以及本系统的重点问题PAGEREF_Toc417808561\h1HYPERLINK\l"_Toc417808562"1.3本文章节安排PAGEREF_Toc417808562\h2HYPERLINK\l"_Toc417808563"第2章系统设计方案论证PAGEREF_Toc417808563\h3HYPERLINK\l"_Toc417808564"2.1控制器模块方案论证PAGEREF_Toc417808564\h3HYPERLINK\l"_Toc417808565"2.2键盘模块方案PAGEREF_Toc417808565\h4HYPERLINK\l"_Toc417808566"2.3电源模块方案PAGEREF_Toc417808566\h4HYPERLINK\l"_Toc417808567"第3章系统硬件设计方案PAGEREF_Toc417808567\h5HYPERLINK\l"_Toc417808568"3.1系统设计框图PAGEREF_Toc4178085