单片机有源蜂鸣器试验程序（带电路图）

ID:321301 · 发表于 2019-2-23 00:26

今天给大家带来的是入门教程：利用stc89c52驱动有源蜂鸣器不同频率发声

蜂鸣器是一种一体化结构的电子讯响器，采用直流电压供电，广泛应用于计算机、打印机、复印机、报警器、电子玩具、汽车电子设备、电话机、定时器等电子产品中作发声器件。蜂鸣器主要分为压电式蜂鸣器和电磁式蜂鸣器两种类型。蜂鸣器在电路中用字母“H”或“HA”（旧标准用“FM”、“ZZG”、“LB”、“JD”等）表示。结构原理蜂鸣器
1．电压式蜂鸣器压电式蜂鸣器主要由多谐振荡器、压电蜂鸣片、阻抗匹配器及共鸣箱、外壳等组成。有的压电式蜂鸣器外壳上还装有发光二极管。
多谐振荡器由晶体管或集成电路构成。当接通电源后（1.5~15V直流工作电压）,多谐振荡器起振,输出1.5~2.5kHZ的音频信号，阻抗匹配器推动压电蜂鸣片发声

压电蜂鸣片 [1] 由锆钛酸铅或铌镁酸铅压电陶瓷材料制成。在陶瓷片的两面镀上银电极，经极化和老化处理后，再与黄铜片或不锈钢片粘在一起。
2．电磁式蜂鸣器电磁式蜂鸣器由振荡器、电磁线圈、磁铁、振动膜片及外壳等组成。
接通电源后，振荡器产生的音频信号电流通过电磁线圈，使电磁线圈产生磁场。振动膜片在电磁线圈和磁铁的相互作用下，周期性地振动发声

电路原理图如下：

单片机源程序如下:

#include<reg52.h>
#define on 0
#define off 1
sbit fm = P2^3;
void delay(unsigned int xms)
{
unsigned int i,j;
for(i=xms;i>0;i--) //i=xms????xms??
for(j=112;j>0;j--);
}
void main()
{
while(1)
{
//第一段渐变式鸣笛 20毫秒→200毫秒→500毫秒→1秒→500毫秒→200毫秒→20毫秒→
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = on;
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = on;
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(1000);
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(1000);
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(1000);
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(1000);
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(1000);
fm = on;
delay(1000);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(500);
fm = on;
delay(500);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(200);
fm = on;
delay(200);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
fm = off;
delay(20);
fm = on;
delay(20);
}
}

复制代码

所有资料51hei提供下载:

不同频率的蜂鸣器实验.zip (65.63 KB, 下载次数: 27)

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单片机有源蜂鸣器试验程序（带电路图）

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