Arduino RGB LED串接控制 全彩LED WS2812 5050

本章要跟大家介紹WS2812這顆RGB控制IC結合LED的使用，目前在生活中，有很多環境，包含餐廳的環境燈控制、廣告招牌、娃娃機機台的彩色LED，很多都是由WS2812這種LED串接而成，簡單地透過一根訊號線就可以控制非常多顆LED的顏色變化，對於做專題來說，節省MCU的腳位，一根IO就可以控制，而且又可以控制變化不一樣的顏色，隨時透過程式調整，十分方便。

LED的外觀如下，那個黑點就是控制晶片，其他金線拉過去的點就是RGB LED



我手邊有的模組是像下面照片中的，另外市面上常見的還有單顆跟圓形



實際實驗環境

參考資料

函式庫網址如下

https://github.com/adafruit/Adafruit_NeoPixel

請將網址資料打包放至如下資料夾
"C:\Users\___XXXX___\Documents\Arduino\libraries"

接線方式

今天採用的是Arduino NANO + WS2812 RGB LED燈條

燈條上的DOUT是用來串接後面的燈條用的
******************接線方式******************
NANO                   WS2812燈條

+5V------------------VCC
D6------------------DIN
GND------------------GND
********************************************

範例程式

這個測試程式是根據裡面的範例simple修改的，可以快速簡單地確認LED是否正常工作
如果想要更多的顏色變化，可以自行修改
由於我實驗的LED燈條有兩顆燒壞了，所以有修改過LED的總數

// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// released under the GPLv3 license to match the rest of the AdaFruit NeoPixel library

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

// Which pin on the Arduino is connected to the NeoPixels?
// On a Trinket or Gemma we suggest changing this to 1
#define PIN            6

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS      6

// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
// example for more information on possible values.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 1000; // 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.
}

void loop() {
   delay(2000);
  // 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, pixels.Color(0,20,0)); // 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).
  }
  for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,0,0)); // 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).
  }

    for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(20,0,0)); // 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).
  }

    for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,0,0)); // 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).
  }

    for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,0,20)); // 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).
  }
      for(int i=0;i<NUMPIXELS;i++){
    // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
    pixels.setPixelColor(i, pixels.Color(0,0,0)); // 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).
  }

}

實際測試影片

未來可行的應用

• 居家的氣氛燈設計
• 汽車、機車的可動車尾燈
• 環境中各種可以透過LED變化的應用
• 生活裝置藝術