【正文】 基于單片機的自動音樂播放器的設(shè)計 摘 要 為方便人們的日常生活，優(yōu)化學(xué)校、機關(guān)等單位的計時系統(tǒng)，采用以單片機為基礎(chǔ)設(shè)計了一種 的 自動音樂播放器。本設(shè)計利用單片機 89C58RD+的定時和計數(shù)功能，來完成時間的顯示和定時功能。并且，通過對定時器初值的設(shè)定來產(chǎn)生不同頻率的聲音，利用定時器中斷來完成對音樂節(jié)拍長度的控制。通過 LM386N1音頻功率放大器，將單片機輸出的信號放大，再通過喇叭播放樂曲。通過 MAX232型芯片，可以轉(zhuǎn)換 PC 機上的電壓和單片機的電源電壓，再通過串口接入 PC 機，這樣就能從 PC 機上將用 C 語言編寫的程序下載到單片機上。最后可在數(shù)碼管上顯示時間，當(dāng)定時時間到后，喇叭自動播放一段連續(xù)的音樂。此設(shè)計擺脫了傳統(tǒng)鬧鐘的刺耳聲音，取而代之的是美妙的音樂，能為人們的日常生活提供準(zhǔn)確的計時，且成本低廉，值得推廣。 關(guān)鍵詞 :單片機；自動音樂播放；音頻轉(zhuǎn)換；時間顯示； LM386N1音頻功率放大器 The design of automatic music player based on monolithic integrated circuit Abstract In order to facilitate people39。s daily life, optimizes schools’, institutions’ timing system, used has designed one kind of automatic music player which based on monolithic integrated circuit. This design fixed time and counts the function using monolithic integrated circuit 89C58RD+, pletes the time the demonstration and fixed time the function. And, Through hypothesis starting value of timer, product the different frequency sound. Severs using the timer pletesthe control of music metre LM386N1 audio power amplifier, enlarges signal which the monolithic integrated circuit outputs,then broadcast music from loudspeaker. Through MAX232 chip,can transform PC machine on the voltage and the monolithic integrated circuit supply then,turns on the puter though String mouth,then it can download procedure which piles with the C language to monolithic integrated circuit from last,it can demonstrates the time on the digital time to after fixed time, the loudspeaker automatically broadcasts section of continual musics. This design get rid of the traditional alarm clock’ s grating sound, displaces is the wonderful music,can provides the accurate time for people39。s daily design cost very inexpensive,it is worth promoting. Key word： Monolithic integrated circuit。 Automatic music broadcast。 Audio frequency transformation。 Time demonstration。 LM386N1 audio power amplifier 目 錄 論文總頁數(shù)：頁 引 言 .......................................................................1 1 設(shè)計任務(wù) ................................................................2 2 軟件 設(shè)計 音樂編程原理及流程圖 ............................................... 聲音的產(chǎn)生 ...................................................... 音頻轉(zhuǎn)換原理 .................................................... 音頻轉(zhuǎn)換流程圖 .............................................. 時間顯示程序設(shè)計 .............................................. 時間顯示模塊 .............................................. 時鐘流程圖 .............................................. 3 硬件電路的 設(shè)計 ..............................................................2 硬件流程模塊 （此節(jié)作為第 1節(jié) 后面幾節(jié)就圍繞它來寫，并且要寫“連貫”） 主要 模塊電路的設(shè)計 .......................... 89C58RD+型 單片機介紹 ......................................... LM386N及外圍電路的 設(shè)計 ............. ............... 串行通信和 MAX232芯片 ........................................... 4 AT89C52 的定時 /計數(shù)器概述 ......................................... 5 LED 顯示原理 ...................................................... 4 KEIL 仿真軟件及 Protel 99 SE 的應(yīng)用 ...................................... KEIL51 的應(yīng)用 .......................................................... Protel 99 SE 的應(yīng)用 ..................................................... PCB 板制作 ............................................................. 5 仿真及調(diào)試過程 .......................................................... 硬件調(diào)試過程 軟件仿真及調(diào)試過程 6 結(jié)果分析 ................................................................ 結(jié) 論 ..................................................................... 參考文獻 ....................................................................... 致 謝 .....................................................................29 聲 明 ...................