#include <Adafruit_NeoPixel.h>

#define DIN_PIN   19    // ESP32 connected to WS2812B_Din
#define LED_CNT 2  // 8個燈
//變數名稱為leds的Adafruit_NeoPixel 類別
Adafruit_NeoPixel leds = Adafruit_NeoPixel(LED_CNT, DIN_PIN, NEO_GRB + NEO_KHZ800);
int led=33;

void setup() {
  pinMode (DIN_PIN, OUTPUT);    //串列輸出腳
pinMode(led, OUTPUT);
  leds.begin();             //初始化
}

void loop() {
  //leds.clear();             //清除 
  for (int i = 0; i < 8; i++) {         
    leds.setPixelColor(i, leds.Color(255, i, 255-16*i));  //紅
    leds.show();     
    digitalWrite(led, HIGH);                                  
    delay(100); 
    digitalWrite(led, 0);                                  
    delay(100); 
  }
  delay(100);
}