FastLED RGBW

rgbw_to_rgb.ino

/*
  THIS SKETCH TRANSPORMS 4-COLOR RGBW LEDS INTO 2 3-COLOR RGB LEDS,
  SO YOU CAN USE FASTLED (WHICH AS OF NOW, HAS NO RGBW SUPPORT), TO 
  CONTROL RGBW LEDS

*/

#include <FastLED.h>

#define NUM_LEDS 16

/*
   for every 3 rgbw leds, we need 4 rgb leds.
   to get rgbw count from rgb, do (count/4)*3, and roud it down
   to get rgb count from rgbw, do (count/3)*4, and round it up
*/

#define NUM_LEDS_RGBW 10


#define LED_PIN 12
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<NEOPIXEL, LED_PIN>(leds, NUM_LEDS);
  Serial.begin(115200);
}
void loop() {

  for (int i = 0; i < NUM_LEDS_RGBW; i++) {
    setRGBW(i, 1, 0, 0, 0);
    //leds[i][0] = 5;
    //leds[i] = CRGB(5,0,0);
    FastLED.show();
    delay(100);
  }
  delay(3000);
  //while (1);
  for (int i = 0; i < NUM_LEDS_RGBW; i++) {
    setRGBW(i, 0, 9, 0, 0);
    FastLED.show();
    delay(100);
  }
  delay(3000);
  for (int i = 0; i < NUM_LEDS_RGBW; i++) {
    setRGBW(i, 0, 0, 9, 0);
    FastLED.show();
    delay(100);
  }

  delay(3000);
  for (int i = 0; i < NUM_LEDS_RGBW; i++) {
    setRGBW(i, 0, 0, 0, 9);
    FastLED.show();
    delay(100);
  }


}


void setRGBW(int led, byte r, byte g, byte b, byte w) {
  //takes r,g,b,w for 4-color LEDs and transfers them into 3-color array
  //to use with fastled
  int segment = int((led / 3.0) * 4.0);



  switch ( led % 3) {
    case 0:  //first
      leds[segment][0] = r;
      leds[segment][1] = g;
      leds[segment][2] = b;
      leds[segment + 1][1] = w;

      break;
    case 1: //second
      leds[segment][0] = g;
      leds[segment][2] = r;
      leds[segment + 1][0] = w;
      leds[segment + 1][1] = b;

      break;
    case 2: //third
      leds[segment][2] = g;
      leds[segment + 1][0] = b;
      leds[segment + 1][1] = r;
      leds[segment + 1][2] = w;

      break;
  }


}