Difference between revisions of "Matrix - LED"
From FriendlyELEC WiKi
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[[Matrix - LED/zh|查看中文]] | [[Matrix - LED/zh|查看中文]] | ||
| − | == | + | ==Introduction== |
[[File:led01.png|thumb|LED]] | [[File:led01.png|thumb|LED]] | ||
[[File:led02.png|thumb|LED]] | [[File:led02.png|thumb|LED]] | ||
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* 2.54mm排针接口，接线方便，通用性强 | * 2.54mm排针接口，接线方便，通用性强 | ||
| − | == | + | ==How To== |
| − | === | + | ===Connection=== |
| − | * | + | *Connect to Tiny4412 SDK (1506) |
| − | :: | + | ::Connect the module's pin S to GPIO PIN1, V to 5V and G grounded |
| − | === | + | ===Code Sample in C Under Linux=== |
<syntaxhighlight lang="c"> | <syntaxhighlight lang="c"> | ||
#include <stdio.h> | #include <stdio.h> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | === | + | ===Compile and Run=== |
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
git clone http://github.com/friendlyarm/fa-hardware.git | git clone http://github.com/friendlyarm/fa-hardware.git | ||
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make | make | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | + | Copy your compiled bin to your board and you are ready to go. | |
| − | == | + | ==Resources== |
Revision as of 07:11, 7 August 2015
Contents
1 Introduction
一个直径为5mm的LED，3-Pin 2.54mm排针，V接电源，G接地，S信号通过一个三极管放大控制LED的导通或关闭。您可以向S输出静态的高低电平信号，也可以输出变化的PWM信号，信号电平可以是3.3V或5V。当您向S输出高电平时LED以最大亮度发光，低电平就完全熄灭，可变占空比的PWM信号可以调节发光的亮度。我们提供红、绿、白三种颜色的配件供您购买。
2 特性
- GPIO或PWM控制，3.3/5V电平，亮度通过PWM可调
- 体积小巧， 带固定孔，方便嵌入到外壳
- 2.54mm排针接口，接线方便，通用性强
3 How To
3.1 Connection
- Connect to Tiny4412 SDK (1506)
- Connect the module's pin S to GPIO PIN1, V to 5V and G grounded
3.2 Code Sample in C Under Linux
#include <stdio.h> #include <unistd.h> #include "libfahw.h" #define LED_BLINK_TIMES 10 int main(int argc, char ** argv) { int ledPin = TINY4412_GPIO_PIN1; int i = 0; int ret = -1; if ((ret = exportGPIOPin(ledPin)) == -1) { printf("exportGPIOPin(%d) failed\n", ledPin); } if ((ret = setGPIODirection(ledPin, GPIO_OUT)) == -1) { printf("setGPIODirection(%d) failed\n", ledPin); } for (i = 0; i < LED_BLINK_TIMES; i++) { if (i % 2) { ret = setGPIOValue(ledPin, GPIO_HIGH); } else { ret = setGPIOValue(ledPin, GPIO_LOW); } if (ret == -1) { printf("setGPIOValue(%d) failed\n", ledPin); } printf("LED blinking times %d\n", i); sleep(1); } unexportGPIOPin(ledPin); return 0; }
3.3 Compile and Run
git clone http://github.com/friendlyarm/fa-hardware.git cd fa-hardware cd demo cd matrix-led make
Copy your compiled bin to your board and you are ready to go.
