Matrix - Relay

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1 Introduction

Relay

• The Matrix-Relay module is a SPDT relay which is an electrically operated switch. Relays are used where it is necessary to control a circuit by a low-power signal. In a electric system it is used to protect electrical circuits from overload or faults.

2 Features

• 1 Form C
• 5V supply voltage, GPIO signal: 3.3/5V
• Current on-contact up to 10A
• LED indicator
• 2.54 mm spacing pin
• PCB dimension (mm): 24 x 48

• Pin Description:

Pin	Description
S	GPIO
V	Supply Voltage 5V
G	Ground

3 Basic Device Operation

This is an SPDT relay. Its supply voltage is 5V and current on-contact is up to 10A. It can drive AC or DC high power loads. NO is Normally Open. NC is Normally Closed. COM is Common. When writing high to pin S NO will be open and NC will be closed.

4 硬件连接

4.1 连接NanoPi M1

参考下图连接模块：

连接说明：

Matrix-Relay	NanoPi M1
S	Pin7
V	Pin4
G	Pin6

4.2 连接NanoPi 2

参考下图连接模块：

连接说明：

Matrix-Relay	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-Relay	NanoPi M2
S	Pin7
V	Pin4
G	Pin6

4.4 连接NanoPC-T2

参考下图连接模块：
Matrix-Relay_NanoPC-T2

连接说明：

Matrix-Relay	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_out

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：

1: gpio status change
2: gpio status change
3: gpio status change
4: gpio status change
5: gpio status change

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_out，内容如下:

int main(int argc, char ** argv) 
{
    int pin = GPIO_PIN(7); 
    int i, value, board;
    int ret = -1;
 
    if ((board = boardInit()) < 0) {
        printf("Fail to init board\n");
        return -1;
    }
    if (board == BOARD_NANOPI_T2)
        pin = GPIO_PIN(15);
 
    if (argc == 2)
        pin = GPIO_PIN(atoi(argv[1]));
    if ((ret = exportGPIOPin(pin)) == -1) {   
        printf("exportGPIOPin(%d) failed\n", pin);
    }
    if ((ret = setGPIODirection(pin, GPIO_OUT)) == -1) {
        printf("setGPIODirection(%d) failed\n", pin);
    }
    for (i = 0; i < STATUS_CHANGE_TIMES; i++) {
        if (i % 2) {
            value = GPIO_HIGH;
        } else {
            value = GPIO_LOW;
        }
        if ((ret = setGPIOValue(pin, value)) > 0) {
            printf("%d: GPIO_PIN(%d) value is %d\n", i+1, pin, value);
        } else {
            printf("setGPIOValue(%d) failed\n", pin);
        }
        sleep(1);
    }
    unexportGPIOPin(pin);
    return 0;
}

API说明参考维基：Matrix API reference manual

7 Resources

DHT11.pdf

8 Update Log

8.1 Feb-19-2016

• Added Section 5