Matrix - Sound Sensor

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1 Introduction

Sound Sensor

By default this module's output level is high. When it detects sound signals its output level will turn low. When sound signals are not detected its output will turn high again without time delay. There is a variable resistor which you can use to control the threshold value of a sound volume. Only when a sound volume's value is greater than this threshold value the module can detect it. Turning clockwise increases this threshold value. Turning anticlockwise decreases this value.

2 特性

• 阈值可调，即时响应
• 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)

G: 接地

V: 接5V

S: GPIO PIN1

3.2 Linux下的C示例

#include <stdio.h>
#include "libfahw.h"
 
static struct sensor sound[] = {
        {
                TINY4412_GPIO_PIN1,
                IRQ_TYPE_EDGE_BOTH,
        }
};
 
int main(void)
{
    int i;
    int retSize = -1;
    char value[ARRAY_SIZE(sound)];
    int devFD = -1;
    if ((devFD =sensorInit(sound, ARRAY_SIZE(sound))) == -1) {
        printf("Fail to init sensor\n");
        return -1;
    }
 
    if (( retSize = sensorRead(devFD, value, ARRAY_SIZE(sound)) ) == -1) {
        printf("Fail to read sensors\n");
    }
    if (retSize > 0) {
        i = 0;
        for(i=0; i<retSize; i++)
        {
            printf("sound[%d]:%d\n", i, value[i]);
        }
        printf("\n");
    }
    sensorDeinit(devFD);
    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-sound_sensor
make

将编译生成的sound通过ftp上传到开发板上运行即可测试。