Difference between revisions of "Matrix - Sound Sensor/zh"
From FriendlyELEC WiKi
Line 117: | Line 117: | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
Waiting event... | Waiting event... | ||
− | + | Device[0] value is 1 | |
</syntaxhighlight> | </syntaxhighlight> | ||
==代码说明== | ==代码说明== | ||
− | + | 所有的开发板都共用一套Matrix代码,本模块的测试示例代码为matrix-gpio_int,内容如下: | |
<syntaxhighlight lang="c"> | <syntaxhighlight lang="c"> | ||
int main(int argc, char ** argv) | int main(int argc, char ** argv) | ||
Line 129: | Line 129: | ||
char value[ARRAY_SIZE(dev)]; | char value[ARRAY_SIZE(dev)]; | ||
− | if ((board = boardInit()) < 0) | + | if ((board = boardInit()) < 0) { |
printf("Fail to init board\n"); | printf("Fail to init board\n"); | ||
+ | return -1; | ||
+ | } | ||
− | if (argc == 2) | + | if (argc == 2) |
dev[0].pin = atoi(argv[1]); | dev[0].pin = atoi(argv[1]); | ||
− | |||
− | |||
system("modprobe "DRIVER_MODULE); | system("modprobe "DRIVER_MODULE); | ||
signal(SIGINT, intHandler); | signal(SIGINT, intHandler); | ||
if (board == BOARD_NANOPI_T2) | if (board == BOARD_NANOPI_T2) | ||
dev[0].pin = GPIO_PIN(15); | dev[0].pin = GPIO_PIN(15); | ||
+ | printf("Use GPIO_PIN(%d)\n", dev[0].pin); | ||
if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) { | if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) { | ||
printf("Fail to init sensor\n"); | printf("Fail to init sensor\n"); | ||
− | + | goto err; | |
} | } | ||
printf("Waiting event...\n"); | printf("Waiting event...\n"); | ||
Line 151: | Line 152: | ||
i = 0; | i = 0; | ||
for (i=0; i<retSize; i++) { | for (i=0; i<retSize; i++) { | ||
− | printf(" | + | printf("Device[%d] value is %d\n", i, value[i]); |
} | } | ||
} | } | ||
sensorDeinit(devFD); | sensorDeinit(devFD); | ||
+ | err: | ||
system("rmmod "DRIVER_MODULE); | system("rmmod "DRIVER_MODULE); | ||
return 0; | return 0; |
Revision as of 06:32, 3 June 2016
Contents
1 介绍
- 模块Matrix-Sound_Sensor用于检测声音。
- 模块上的可调电阻可以调整响应的阀值,顺时针旋转可调电阻增大阀值,即音量较大时才被检测到。
- 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。
2 特性
- 阀值可调,即时响应
- 2.54mm排针接口,接线方便,通用性强
- PCB尺寸(mm):16x24
- 引脚说明:
名称 | 描述 |
S | GPIO |
V | 电源5V |
G | 地 |
3 工作原理
- 该传感器内置一个对声音敏感的电容式驻极体话筒。声波使话筒内的驻极体薄膜振动,导致电容的变化,而产生与之对应变化的微小电压。
- 声音传感器的作用相当于一个话筒(麦克风)。它用来接收声波,显示声音的振动图象。当接收当声音时会输出1,但不能对噪声的强度进行测量。
4 硬件连接
4.1 连接NanoPi M1
连接说明:
Matrix-Sound_Sensor | NanoPi M1 |
S | Pin7 |
V | Pin4 |
G | Pin6 |
4.2 连接NanoPi 2
连接说明:
Matrix-Sound_Sensor | NanoPi 2 |
S | Pin7 |
V | Pin4 |
G | Pin6 |
4.3 连接NanoPi M2 / NanoPi 2 Fire
NanoPi M2和NanoPi 2 Fire的40 Pin引脚定义是一模一样的,所以它们操作Matrix配件的步骤是一样的,这里仅以NanoPi M2为例。
参考下图连接模块:
连接说明:
Matrix-Sound_Sensor | NanoPi M2 |
S | Pin7 |
V | Pin4 |
G | Pin6 |
4.4 连接NanoPC-T2
参考下图连接模块:
Matrix-Sound_Sensor_NanoPC-T2
连接说明:
Matrix-Sound_Sensor | NanoPC-T2 |
S | Pin15 |
V | Pin29 |
G | Pin30 |
5 编译运行测试程序
启动开发板并运行Debian系统,进入系统后克隆Matrix代码仓库:
$ apt-get update && apt-get install git $ git clone https://github.com/friendlyarm/matrix.git
克隆完成后会得到一个名为matrix的目录。
编译并安装Matrix:
$ cd matrix $ make && make install
运行测试程序:
$ matrix-gpio_int
注意:此模块并不支持热插拔,启动系统前需要确保硬件连接正确。
运行效果如下:
Waiting event... Device[0] value is 1
6 代码说明
所有的开发板都共用一套Matrix代码,本模块的测试示例代码为matrix-gpio_int,内容如下:
int main(int argc, char ** argv) { int i, board; int retSize = -1; char value[ARRAY_SIZE(dev)]; if ((board = boardInit()) < 0) { printf("Fail to init board\n"); return -1; } if (argc == 2) dev[0].pin = atoi(argv[1]); system("modprobe "DRIVER_MODULE); signal(SIGINT, intHandler); if (board == BOARD_NANOPI_T2) dev[0].pin = GPIO_PIN(15); printf("Use GPIO_PIN(%d)\n", dev[0].pin); if ((devFD =sensorInit(dev, ARRAY_SIZE(dev))) == -1) { printf("Fail to init sensor\n"); goto err; } printf("Waiting event...\n"); if ((retSize = sensorRead(devFD, value, ARRAY_SIZE(dev))) == -1) { printf("Fail to read sensors\n"); } if (retSize > 0) { i = 0; for (i=0; i<retSize; i++) { printf("Device[%d] value is %d\n", i, value[i]); } } sensorDeinit(devFD); err: system("rmmod "DRIVER_MODULE); return 0; }
API说明参考维基:Matrix API reference manual