6、ct:As the bell has a wonderful blend of electronic music, low price and low power consumption advantages of modern household more and more popular.With electronic music doorbell, where guests visit, the hearing will no longer be monotonous tone, but the extr
7、aordinary pop melodies.Sound effects such as personalized electronic music.Here a single chip design with electronic music doorbell, just AT89C51 microcomputer system, together with a small LM386 audio amplifier to do the output to the speaker.Visitor, click
8、 the button, doorbell will play the beautiful electronic music.第一章设计原理及组成1.1设计原理音乐门铃的设计方案,掌握了汇编语言的编程方法,并熟练的运用AT89C51单片机定时器产生固定频率的方波信号。推动喇叭发出旋律,音乐是由音符组成的,不同的音符是由相应的频率的震动产生,产生不同的音频要有不同固定周期的脉冲信号。要产