查看彩色LED模块 - 24位的源代码


[[Image:彩色LED_24.jpg|400px|thumb|彩色LED_24]]



=== 产品简介 ===
<br>
彩色LED模块采用24颗 WS2812（RGB全彩高亮LED）设计制作完成。WS2812是一个集控制电路与发光电路于一体的智能外控LED光源，内置信号整形电路，任何一个像素点收到信号后经过波形整形再输出，保证线路波形畸变不会累加，且每个像素点的三基色颜色可实现256级亮度显示，完成16777216种颜色的全真色彩显示，扫描频率不低于400Hz/s，内置上电复位和掉电复位电路。串行级联接口，能通过一根信号线完成数据的接收与解码。可以用于彩色提示灯等。



=== 规格参数 ===
<br>
*供电电压：DC3.3 - 5V
*色彩显示：16777216种颜色的全真色彩显示
*亮度调节：256级亮度调节
*扫描频率：>=400Hz/s
*数据传输速率：800Kbps
*串行级联：<5M时，不需要外接电路 / 刷新速率30帧/秒时，低速模式下 >=512个，高速模式下  >=1024个




=== 引脚说明 ===
<br>
*1. G  --  Gnd(地)
*2. V  --  Vcc(电源+5V)
*3. S  --  Sign(信号)



=== 应用示例 ===
<br>
:'''电路连接示意图'''
<br>
::'''LED模块'''的 G、V、S分别连接 '''Arduino UNO'''的GND、VCC(+5V)、D5引脚。


<img src="http://image.yfrobot.com/Neopixel/neopixel_24_750.jpg-yf" alt="neopixel_24_750" />



:'''示例代码'''
<pre >
#include <Adafruit_NeoPixel.h>

#define Red Color(255,0,0)
#define Green Color(0,255,0)
#define Blue Color(0,0,255)

#define PIN            5
#define NUMPIXELS      24

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 500; // delay for half a second

void setup() {
  // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
#if defined (__AVR_ATtiny85__)
  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif
  // End of trinket special code

  pixels.begin(); // This initializes the NeoPixel library.
  pixels.show();
}

void loop() {
  lightLED(pixels.Red);          //Order lit the red light
  lightLED(pixels.Green);        //Order lit the green light
  lightLED(pixels.Blue);         //Order lit the blue light
}

void lightLED(uint32_t c) {
  // For a set of NeoPixels the first NeoPixel is 0, second is 1, all the way up to the count of pixels minus one.
  for (int i = 0; i < NUMPIXELS; i++) {
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, c); // Moderately bright green color.
    pixels.show(); // This sends the updated pixel color to the hardware.
    delay(delayval); // Delay for a period of time (in milliseconds).
  }
}
</pre>



===参考资料===
<br>
* [http://www.yfrobot.com/wiki/images/5/53/WS2812_Specification_sheet.pdf WS2812说明书-英文] [https://eyun.baidu.com/s/3jHZxjam 备用地址]
* [http://www.yfrobot.com/wiki/images/a/aa/WS2812%E8%A7%84%E6%A0%BC%E4%B9%A6.pdf WS2812说明书-中文] [https://eyun.baidu.com/s/3mi3LlqS 备用地址]
* 规格表合集 - 5050LED/WS2801/WS2811/WS2812 下载：[https://eyun.baidu.com/s/3nv5e97b LED_Specification_sheets]
* [https://eyun.baidu.com/s/3c1HXUm8 Arduino-WS2812库-FastLED]
* [https://eyun.baidu.com/s/3o8jxLs2 Arduino-WS2812库-Adafruit_NeoPixel]


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