Matrix - Water Sensor

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Revision as of 14:17, 28 June 2016 by Yftan (Talk | contribs) (Applications)

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1 介绍

水位检测模块
  • 模块Matrix-Water_Sensor是一个简易、性价比较高的水位/水滴识别检测传感器模块,适用于对液位高度的检测,可轻松完成水量到模拟信号的转换。
  • 灵敏度可通过电位器调节。

2 特性

  • 使用标准的3 PIN接口
  • 尺寸为 16x60mm
  • PCB尺寸(mm):16x60

Water Sensor.PCB

  • Pin Description
Pin Description
S GPIO
V Supply Voltage 5V
G Ground

3 工作原理

  • 模块通过一系列暴露的平行导线线迹,利用线迹电极间的电阻与液位高度成比例,测量水量大小从而判断水位。

利用线迹电极间的电阻与雨滴量成比例,测量是否下雨。

4 Applications

The Matrix-Water_Sensor module outputs analog signals which can be converted to digital signals through an ADC converter e.g. the Matrix-Analog_to_Digital_Converter module.
For more details about the Matrix-Analog_to_Digital_Converter module refer to wiki:Matrix_-_Analog_to_Digital_Converter

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-Water_Sensor_nanopi_m1

Connection Details:

Matrix-Water_Sensor
GND NanoPi M1 Pin9
5V NanoPi M1 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-Water_Sensor_nanopi_2

Connection Details:

Matrix-Water_Sensor
GND NanoPi 2 Pin9
5V NanoPi 2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.3 Connect to NanoPi M2 / NanoPi 2 Fire

Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:
Matrix-Water_Sensor_nanopi_m2

Connection Details:

Matrix-Water_Sensor
GND NanoPi M2 Pin9
5V NanoPi M2 Pin2
S Matrix-Analog_to_Digital_Converter A0

4.4 Connect to NanoPC-T2

Refer to the following connection diagram to connect the module to the NanoPC-T2:
Matrix-Water_Sensor_NanoPC-T2

Connection Details:

Matrix-Potentiometer
GND NanoPC-T2 USB Host GND
5V NanoPC-T2 USB Host 5V
S Matrix-Analog_to_Digital_Converter A0

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-adc

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:

The channel0 value is 2460

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-analog_to_digital_converter,内容如下:

int main(int argc, char ** argv)
{
    int i = 0;
    int value = 0;
    int channel = 0;
 
    if (boardInit() < 0) {
        printf("Fail to init board\n");
        return -1;
    }
 
    if (argc == 2)
        channel = atoi(argv[1]);
    system("modprobe "DRIVER_MODULE);
    signal(SIGINT, intHandler);
    for (i=0; i<ADC_READ_TIMES; i++) {
        if (pcf8591Read(channel, &value) != -1) {
            printf("The channel%d value is %d\n", channel, value);
        } else {
            printf("Fail to get channel%d value\n", channel);
        }
    }
    system("rmmod "DRIVER_MODULE);
 
    return 0;
}

API说明参考维基:Matrix API reference manual

7 相关资料