Difference between revisions of "Matrix - LED"

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The module has three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.  
 
The module has three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.  
  
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==硬件连接==
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==Applications==
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===连接NanoPi M1===
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===Connect to NanoPi M1===
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参考下图连接模块：<br>
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Refer to the following connection diagram to connect the module to the NanoPi M1:<br>
 
[[File:Matrix-LED_nanopi_m1.jpg|frameless|600px|Matrix-LED_nanopi_m1]]
 
[[File:Matrix-LED_nanopi_m1.jpg|frameless|600px|Matrix-LED_nanopi_m1]]
  
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连接说明：
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Connection Details:
 
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===连接NanoPi 2===
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===Connect to NanoPi 2===
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参考下图连接模块：<br>
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Refer to the following connection diagram to connect the module to the NanoPi 2:<br>
 
[[File:Matrix-LED_nanopi_2.jpg|frameless|600px|Matrix-LED_nanopi_2]]
 
[[File:Matrix-LED_nanopi_2.jpg|frameless|600px|Matrix-LED_nanopi_2]]
  
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连接说明：
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Connection Details:
 
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===连接NanoPi M2 / NanoPi 2 Fire===
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===Connect to NanoPi M2 / NanoPi 2 Fire===
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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。<br>
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Refer to the following connection diagram to connect the module to the NanoPi M2/ NanoPi 2 Fire:<br>
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参考下图连接模块：<br>
+
 
[[File:Matrix-LED_nanopi_m2.jpg|frameless|600px|Matrix-LED_nanopi_m2]]
 
[[File:Matrix-LED_nanopi_m2.jpg|frameless|600px|Matrix-LED_nanopi_m2]]
  
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连接说明：
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Connection Details:
 
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===连接NanoPC-T2===
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===Connect to NanoPC-T2===
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参考下图连接模块：<br>
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Refer to the following connection diagram to connect the module to the NanoPC-T2:<br>
 
[[File:Matrix-LED_NanoPC-T2.jpg|frameless|600px|Matrix-LED_NanoPC-T2]]
 
[[File:Matrix-LED_NanoPC-T2.jpg|frameless|600px|Matrix-LED_NanoPC-T2]]
  
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连接说明：
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Connection Details:
 
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Revision as of 14:31, 21 June 2016

查看中文

1 Introduction

LED
LED
LED

The Matrix-LED is an LED module with three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.

2 Features

  • GPIO/PWM interface, 3.3/5V, PWM brightness control
  • Small, easy to be used in various situations
  • 2.54 mm spacing pin
  • PCB Dimension(mm): 8 x 24

LED-01.PCB

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

3 Basic Device Operation

The module has three 2.54 mm spacing pins: V(supply voltage),G(ground) and S(signal) which is connected to a triode to turn the LED on or off. You can write high or low, or PWN signals(3.3V or 5V) to S. When you write high to S the LED will turn on and become brightest. When you write low to S the LED will turn off. If you write PWM signals to S the LED's brightness will vary depending on the PWM's signal variances.

4 Applications

4.1 Connect to NanoPi M1

Refer to the following connection diagram to connect the module to the NanoPi M1:
Matrix-LED_nanopi_m1

Connection Details:

Matrix-LED NanoPi M1
S Pin7
V Pin4
G Pin6

4.2 Connect to NanoPi 2

Refer to the following connection diagram to connect the module to the NanoPi 2:
Matrix-LED_nanopi_2

Connection Details:

Matrix-LED NanoPi 2
S Pin7
V Pin4
G Pin6

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-LED_nanopi_m2

Connection Details:

Matrix-LED NanoPi M2
S Pin7
V Pin4
G Pin6

4.4 Connect to NanoPC-T2

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

Connection Details:

Matrix-LED 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

可以看到LED在不停地闪烁。

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

8 Update Log

8.1 Feb-18-2016

  • Added the description for "NanoPi 2 branch" in Section 4
  • Added Section 5: Connect to NanoPi 2


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