FastLED RGB Dials - Example project showing how to use Red, Green, and Blue to create color.

FastLED-RGB-Dials.ino

#include "FastLED.h"

// How many leds in your strip?
#define NUM_LEDS 8

#define DATA_PIN 0

#define RED_PIN   A7
#define GREEN_PIN A8
#define BLUE_PIN  A9

// Define the array of leds
CRGB leds[NUM_LEDS];

byte hue = 0;

void setup() {
  FastLED.addLeds<WS2811, DATA_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(64);
}

void loop() {
  int value = analogRead(RED_PIN); // read the value from the potentiometer
  byte red = value / 4;            // scale value from 0-1024 to 0-255

  value = analogRead(GREEN_PIN);   // read the value from the potentiometer
  byte green = value / 4;          // scale value from 0-1024 to 0-255

  value = analogRead(BLUE_PIN);    // read the value from the potentiometer
  byte blue = value / 4;           // scale value from 0-1024 to 0-255

  CRGB color = CRGB(red, green, blue);
  
  fill_solid(leds, NUM_LEDS, color);
  
  FastLED.show();
}