#include "FastLED.h"
#define leds1PIN 8
#define leds2PIN 9
#define LED_TYPE WS2811
#define COLOR_ORDER GRB
#define NUM_LEDS 50
#define BRIGHTNESS 96
#define FRAMES_PER_SECOND 120
#define START_SPEED 1
#define BLOCK_SIZE 6

CRGB leds [NUM_LEDS + BLOCK_SIZE ];  // space on the end to continue pattern
CRGB base[BLOCK_SIZE ];

CRGB  mycyan2 = {0, 255, 127};
CHSV  mycyan = {145,255,20};

#define RATE 10 //how fast block patern moves (smaller number is faster)
#define RATE_WAIT 3000 // between pulses

uint8_t pos = 0;  // position along strip
uint8_t start_block_element=0;  // position along block

void turnon()
{
  for ( int y=0; y <NUM_LEDS;y++ )
  {
   leds[y] = mycyan  ;
   FastLED.delay(START_SPEED); 
  }
}


void initial_pattern()
{
while  (pos < NUM_LEDS + BLOCK_SIZE )
  {
  EVERY_N_MILLISECONDS(RATE) 
    {
    start_block_element=0;
   // if starting not all block is shown
   if ( pos < BLOCK_SIZE )
    {
      start_block_element =BLOCK_SIZE-(pos); 
    }
    for ( uint8_t t= start_block_element; t < BLOCK_SIZE; t++)
      {
         leds[pos +(t-BLOCK_SIZE)] = base[t];
      }
     pos++;  
  }
   FastLED.show();  // Display the pixels.
   }
}

void setup() {
  Serial.begin(9600);

    Serial.print(" h="); Serial.print(mycyan.h);
    Serial.print(" s="); Serial.print(mycyan.s);
    Serial.print(" v="); Serial.println(mycyan.v);

FastLED.addLeds<WS2812,leds1PIN,COLOR_ORDER >(leds,NUM_LEDS);
FastLED.addLeds<WS2812,leds2PIN,COLOR_ORDER >(leds,NUM_LEDS);
// set master brightness contro]
FastLED.setBrightness(BRIGHTNESS);

  // change BLOCK_SIZE to suit
  base[0]  = mycyan;  // end of pattern - 
  base[1] =  CRGB::Yellow;
  base[2] =  CRGB::Yellow;
  base[3] =  CRGB::White;
  base[4] =  CRGB::Yellow;
  base[5] =  CRGB::Yellow;

turnon();
initial_pattern();

}

void loop() {
 EVERY_N_MILLISECONDS(RATE_WAIT) 
 {
  pos=0;
  initial_pattern();
 }
  
}