【正文】 er control through the I/O ports to control LED, the level of high and low so as to realize the purpose of the different pattern of flowing water light. Key words: LED , MCU ,High and Low output leve 目錄 III 目 錄 第 1 章 引言 ...................................................................................................................1 研究背景及意義 ........................................................................................................1 國(guó)內(nèi)外研究現(xiàn)狀以及本系統(tǒng)的重點(diǎn)問題 ................................................................1 本文章節(jié)安排 ............................................................................................................2 第 2 章 系統(tǒng)設(shè)計(jì)方案論證 ...........................................................................................3 控制器模塊方案論證 ................................................................................................3 鍵盤模塊方案 ............................................................................................................4 電源模塊方案 ............................................................................................................4 第 3 章 系統(tǒng)硬件設(shè)計(jì)方案 ...........................................................................................5 系統(tǒng)設(shè)計(jì)框圖 ............................................................................................................5 硬件電路設(shè)計(jì) ............................................................................................................5 電源電路 .................................................................................................................5 單片機(jī) 89C52 最小系統(tǒng) .........................................................................................6 按鍵電路 ...............................................................................................................13 LED 燈電路 ...........................................................................................................13 第 4 章 程序設(shè)計(jì)及軟件仿真 .....................................................................................15 軟件設(shè)計(jì)框圖 ..........................................................................................................15 軟件開發(fā)平臺(tái)選擇 ..................................................................................................15 軟件系統(tǒng)功能模塊 ..................................................................................................16 初始化模塊 ...........................................................................................................16 延時(shí)函數(shù) ...............................................................................................................17 定時(shí)器控制模塊 ...................................................................................................17 鍵盤掃描模式 .......................................................................................................17 LED 燈輸出控制模塊 ...........................................................................................18 程序調(diào)試仿真 ..........................................................................................................19 仿真平臺(tái)介紹 .......................................................................................................19 仿真測(cè)試 ...............................................................................................................19 第 5 章 硬件調(diào)試 .........................................................................................................21 目錄 IV 硬件設(shè)計(jì) ..................................................................................................................21 硬件調(diào)試 ..................................................................................................................21 下載功能調(diào)試 .......................................................................................................21 LED 電路測(cè)試 .......................................................................................................21 模式選擇功能調(diào)試 ...............................................................................................22 速度加減功能調(diào)試 ...............................................................................................22 復(fù)位電路調(diào)試 .......................................................................................................22 穩(wěn)定性測(cè)試 ...........................................................................................................22 總結(jié) .................................................................................................................................23 致謝 .................................................................................................................................25 參考文獻(xiàn) .........................................................................................................................26 附錄 .................................................................................................................................27 附錄一：原理圖 .............................................................................................................27 附錄二：硬件實(shí)物 .........................................................................................................28 附錄三：程序代碼 .........................................................................................................29 第 1 章 引言 1 第 1 章 引言 研究背景及意義 現(xiàn)如今，隨著集成化芯片的飛速發(fā)展，分立元件或數(shù)字邏輯電路正逐步被集成電路所取代，而單片機(jī)作為一種集成電路，其價(jià)格低廉，且可靠性強(qiáng)、控制簡(jiǎn)單但控制方法多樣。 關(guān)鍵詞： LED，單片機(jī) ，高低電平變化ABSTRACT II ABSTRACT The rapid development of puter technology and improving, bring us to the new era, now,