#include <Arduino.h>
#include <FastLED.h>

#define MAX_MILLIWATTS 0
#define LED_PIN        2
#define NUM_LEDS       20
#define CHIPSET        WS2812B
#define COLOR_ORDER    GRB



CRGB leds[NUM_LEDS];

int i = 0;

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

  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setCorrection(UncorrectedColor);
  FastLED.setTemperature(UncorrectedTemperature);
  FastLED.setDither(DISABLE_DITHER);
  // FastLED.setMaxRefreshRate(400);

  if (MAX_MILLIWATTS > 0) FastLED.setMaxPowerInMilliWatts(MAX_MILLIWATTS);

  leds[0] = CRGB::Red; 

  FastLED.show();

  
}


void loop() {
  leds[i] = CRGB::Black;

  i++;

  if (i >= NUM_LEDS) {
    i = 0;
  }

  leds[i] = CRGB::Red;

  FastLED.show();

  delay(100);


}