#include <Adafruit_NeoPixel.h>

int PIN = 12;
int NUMPIXELS = 16;

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, PIN);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  strip.begin();
  strip.show();
}

void loop() {
  rainbowCycle(0.001);
}
void rainbowCycle(int wait){
  int numPixels = strip.numPixels();
  for (int j = 0; j<256; j++){
    for(int i = 0; i<numPixels; i++){
      strip.setPixelColor(i, Wheel((i+j)& 255));
    }
    strip.show();
    delay(wait);
  }
}
uint32_t Wheel(byte WheelPos){
  WheelPos = 255-WheelPos;
  if(WheelPos < 85){
    return strip.Color(255-WheelPos*3,0,WheelPos*3);

  }
  if(WheelPos < 170){
    WheelPos-=25;
    return strip.Color(0,WheelPos*3,255-WheelPos*3);
    
  }
  WheelPos-=170;
  return strip.Color(WheelPos*3,255-WheelPos*3,0);
}