FastLED_Fade_Test2.ino

#include <FastLED.h>

#include <Adafruit_NeoPixel.h>

#define NUM_LEDS 16
#define DATA_PIN 3

CRGB leds[NUM_LEDS];

int
  currentColor = 0,
  lastColor = 0,
  currentSaturation = 0,
  lastSaturation = 0,
  currentBrightness = 50,
  lastBrightness = 0,
  ledPosition = 0,
  lastPosition = 0,
  offPosition = 0;



void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);

}

void loop() {


  //start with Blue as Starting LED at position 2
  
  //set LEDs to their positions and increment
  for (int i = 0; i<NUM_LEDS; i++){
    leds[i] = offPosition;
    leds[i+1] = lastPosition;
    leds[i+2] = ledPosition;
    updateWheel(); //call update wheel function
    currentColor++; //advance color each pass through the loop
    if(currentColor==255){currentColor=0;}
  }

}

void updateWheel() {
  leds[offPosition] = CHSV(0,0,0);
  leds[lastPosition] = CHSV(currentColor,currentSaturation,currentBrightness%50);
  leds[ledPosition] = CHSV(currentColor,currentSaturation,currentBrightness);
  FastLED.show();
  offPosition = lastPosition;
  lastPosition = ledPosition;
  ledPosition = (ledPosition + 1) % 256;
 
}

there are errors but i'm not sure where to start with this.

not really sure about the relationship between the wheel update function and the for loop. i guess you would eventually code a millis() check in the main loop for the wheelUpdate? i was hoping to figure out how to advance the dot around the ring while cycling through the hue/color range, but do i need to organize it as a mode?