LED環形流水燈

文章參考自：ESP32 AND WS2812 RGB LED RING EXAMPLE

接線：

接腳定義：

環形LED是WS2812晶片，上面就三支接腳：

DI:Data Input

5v: 接單晶片主板上的Vout (3.3V或5v)

GND: 接地 ground

DO: Data Output (WS2812燈條串接下一個組燈條用)

程式碼：

#include <Adafruit_NeoPixel.h>

#define PIN            15

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS      45 //45顆LED

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 50; // delay for half a second

void setup() 
{
  pixels.begin(); // This initializes the NeoPixel library.
}

void loop() 
{
  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(255,0,0)); // 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(0,255,0)); // 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(0,0,255)); // 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).
  }
}

研究這個主題，請下關鍵字：

1. LED Ring/LED環形燈
2. WS2812
3. NeoPixel程式庫

用 Google搜尋後，再用圖片的方式來找出需要的資訊。