Difference between revisions of "Matrix - Buzzer"
From FriendlyELEC WiKi
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cd fa-hardware | cd fa-hardware | ||
cd demo | cd demo | ||
| − | cd buzzer | + | cd matrix-buzzer |
make | make | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 02:52, 24 July 2015
Contents
1 介绍
Matrix-Buzzer主要器件是一个5V无源蜂鸣器。无源蜂鸣器内部不带震荡源，要使其鸣叫外部必须施加一个震荡信号。使用时V引脚接5V电源，G引脚接电源地，并向S引脚输出PWM信号。这个PWM信号通过一个三极管放大控制无源蜂鸣器的导通或关闭，使得蜂鸣器鸣叫。PWM信号可以是3.3V或者5V电平，蜂鸣器鸣叫的声音随着PWM频率的变化而变化。
2 特性
- 5V Power Supply
- 3.3V/5V PWM
- 体积小巧， 带固定孔，方便嵌入到外壳
- 2.54mm排针接口，接线方便，通用性强
3 使用方法
3.1 连接
- 连接到Tiny4412 SDK (1506)
- 首先，你需要去掉Tiny4412 SDK 1506底板上面的BP1_EN的跳线帽
- 然后，将配件S针脚连接到GPIO PIN1, V接5V，G接地
3.2 Linux下的C示例
#include <stdio.h> #include <unistd.h> #include <stdlib.h> #include "libfahw.h" int parseCmd(int argc, char **argv, int *pin, int *Hz, int *duty) { int num = atoi(argv[1]); int hz = atoi(argv[2]); int dt = atoi(argv[3]); if (hz<0) { return -1; } if (dt<0 || dt>1000) { return -1; } switch(num) { case 0: *pin = TINY4412_PWM0; break; case 1: *pin = TINY4412_PWM1; break; default: printf("Unsupported pin TINY4412_PWM%d\n", num); num = 0; *pin = TINY4412_PWM0; } *Hz = hz; *duty = dt; printf("Using config: pin=PWM%d freq=%dHz duty=%d\n", num, hz, dt); return 0; } int main(int argc, char ** argv) { int pin = TINY4412_PWM0; int Hz; int duty; if (argc == 4) { if (parseCmd(argc, argv, &pin, &Hz, &duty) == -1) { return -1; } } else { Hz = 1000; duty = 500; printf("Usage:%s PWM[0~1] freq duty[0~1000]\n", argv[0]); printf("Using default config: pin=PWM0 freq=%dHz duty=%d\n", Hz, duty); } if (PWMPlay(pin, Hz, duty) == -1) { printf("Fail to output PWM\n"); } printf("Press enter to stop PWM\n"); getchar(); PWMStop(pin); printf("Stopped PWM\n"); return 0; }
3.3 编译并运行示例
git clone http://github.com/friendlyarm/fa-hardware.git cd fa-hardware cd demo cd matrix-buzzer make
将编译生成的buzzer通过ftp上传到开发板上运行即可测试。
