// for: https://forum.arduino.cc/t/fastled-project-running-at-half-speed-it-seems/1021155

#include <FastLED.h>

// How many leds in your strip?
#define NUM_LEDS 144

// For led chips like WS2812, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
// Clock pin only needed for SPI based chipsets when not using hardware SPI
#define DATA_PIN 9


// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() {

  FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);  // GRB ordering is typical
  FastLED.setMaxPowerInVoltsAndMilliamps(5, 500);

  pinMode (8, OUTPUT);
  digitalWrite (8, HIGH);
  pinMode (10, OUTPUT);
  digitalWrite (10, LOW);

  //FastLED.setMaxRefreshRate(0);
}

void loop() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CHSV(i, 255, 255);
    leds[i - 1] = CRGB::Black;
    FastLED.show();
    //FastLED.clear();
  }

  for (int i = NUM_LEDS; i > 0; i--) {
    leds[i] = CHSV(i, 255, 255);
    FastLED.show();
    FastLED.clear();
  }
}