#include <FastLED.h>

#define LED_PIN     7
#define NUM_LEDS    50
#define LED_TYPE    WS2811


CRGB leds[NUM_LEDS];
uint8_t paletteIndex = 0;
uint8_t ColorIndex[NUM_LEDS];
uint8_t colorIndex[NUM_LEDS];

CRGBPalette16 GreenFade= CRGBPalette16{
    CRGB::Blue
};

CRGBPalette16 GreenLink = GreenFade;

void setup() {     
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS); 
  FastLED.setBrightness(100);
}

void loop()
{
  TurnOnFadeLinkGreen();      
}

void TurnOnFadeLinkGreen() {
  uint8_t sinBeat = beatsin8( 40, 50, 255, 0, 0 );
    for ( int i = 0; i< NUM_LEDS ; i++ ) {
      leds[i] = ColorFromPalette(GreenLink, ColorIndex[i], sinBeat);
    }
    for( int i = 0; i< NUM_LEDS ; i++) {
      colorIndex[i] = random8();
    }
    FastLED.show();    
 }