marquee_with_holes.ino

//***************************************************************
// Custom marquee pattern example with "virtual holes" in the
//   strip that are kept blacked out.
//
// Marc Miller, Dec 2016
//***************************************************************

#include "FastLED.h"

#define LED_TYPE LPD8806
#define NUM_LEDS 32
#define COLOR_ORDER GRB
//#define LED_TYPE APA102
//#define NUM_LEDS 39
//#define COLOR_ORDER BGR

#define DATA_PIN 11
#define CLOCK_PIN 13
CRGB leds[NUM_LEDS];
#define BRIGHTNESS 32

uint16_t holdTime = 80;  // Milliseconds to hold position before advancing.
int16_t pos;             // Used to store pixel position.

//---------------------------------------------------------------
void setup() {
  Serial.begin(115200);  // Allows serial monitor output (check baud rate)
  delay(3000);  // Startup delay
  FastLED.addLeds<LED_TYPE, DATA_PIN, CLOCK_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}

//---------------------------------------------------------------
void loop() {

  EVERY_N_MILLISECONDS(holdTime){  // Advance pixels to next position.
    for (uint8_t i=0; i<NUM_LEDS/4; i++){
        pos = (pos + 4) % NUM_LEDS;  // Advance down strip and rollever if needed.
        leds[pos]              = CHSV(200,220,255);  // purple
        leds[pos-1 % NUM_LEDS] = CHSV(0,220,180);    // red
        leds[pos-2 % NUM_LEDS] = CHSV(96,220,200);   // green
        leds[pos-3 % NUM_LEDS] = CHSV(0,0,0);        // black
    }

    BlackHoles();  // Black out "virtual holes" before displaying all pixels.
    FastLED.show();
    pos = (pos + 1) % NUM_LEDS;  // Advance down strip
  }

}//end_main_loop


//---------------------------------------------------------------
//Function to black out specific pixels
void BlackHoles()
{
  // List of pixels to always have blacked out
  uint8_t holes[] = {
    6,8,16,17,18,19,21
  };
  
  for (uint8_t i=0; i <= sizeof(holes); i++){
    leds[holes[i]] = CHSV(0,0,0);  // black
  }
}//end_BlackHoles