#include <FastLED.h>

#define COLOR_ORDER GRB
#define LED_TYPE WS2812
#define NUM_LEDS 30
 
uint8_t max_bright = 255;
 
struct CRGB box[NUM_LEDS];
 
void setup() {
  Serial.begin(115200);
 
  LEDS.addLeds<LED_TYPE, 6, COLOR_ORDER>(box, NUM_LEDS);

  FastLED.setBrightness(max_bright);
  FastLED.setMaxPowerInVoltsAndMilliamps(5, 1000);
} // setup
 
void loop () {
  rainbow_wave(10, 10);
  FastLED.show();
} // loop
 
void rainbow_wave(uint8_t thisSpeed, uint8_t deltaHue) {
  uint8_t thisHue = beatsin8(thisSpeed,0,255);                // A simple rainbow wave.
  //uint8_t thisHue = beat8(thisSpeed,255);                     // A simple rainbow march.  
  fill_rainbow(box, NUM_LEDS, thisHue, deltaHue);            // Use FastLED's fill_rainbow routine. 
} // rainbow_wave