Difference between revisions of "Matrix - Sound Sensor"
From FriendlyELEC WiKi
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===连接=== | ===连接=== | ||
*连接到Tiny4412 SDK (1506) | *连接到Tiny4412 SDK (1506) | ||
| − | :: | + | ::G针脚: 接地 |
| − | :: | + | ::V: 接5V |
::S: GPIO PIN1 | ::S: GPIO PIN1 | ||
Revision as of 09:35, 27 July 2015
Contents
1 介绍
配件在默认状态下输出高电平，当检测到有声音的时候输出低电平，声音消失后恢复高电平，没有延时。配件上面的可调电阻可以调整检测的阈值，也即音量。顺时针旋转可调电阻增大阈值，可检测到的声音音量越大，反之越小。
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针脚: 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。
