Controlling Addressable LED's

or more information on Pixels (with a colour chart at the bottom of the page), see:

• https://github.com/FastLED/FastLED/wiki/Pixel-reference#predefined-colors-list

#include "FastLED.h"                                          // FastLED library.

#if FASTLED_VERSION < 3001000                                 // This guarantees the person will have to use FastLED 3.1
#error "Requires FastLED 3.1 or later; check github for latest code.".
#endif
 
// Fixed definitions cannot change on the fly.
#define LED_DT 12                                             // Data pin to connect to the strip.
#define LED_CK 11                                             // Clock pin used by WS2801 or APA102.
#define COLOR_ORDER BGR                                       // Use BGR for APA102 and GRB for WS2812.
#define LED_TYPE APA102                                       // Or WS2812. Don't forget to change the FastLED.addLeds line as well.
#define NUM_LEDS 20                                           // Number of LED's.

// Initialize changeable global variables.
uint8_t max_bright = 64;                                      // Overall brightness definition. It can be changed on the fly, i.e. with a potentiometer.

struct CRGB leds[NUM_LEDS];                                   // Initialize our LED array.


void setup () {
  delay(3000);                                                // If things go bad, you can shutdown before the LED's start drawing power.
  Serial.begin(57600);                                        // Get the serial port running for debugging.

//  FastLED.addLeds<LED_TYPE, LED_DT, COLOR_ORDER>(leds, NUM_LEDS);        // Use this for WS2812B
  FastLED.addLeds<LED_TYPE, LED_DT, LED_CK, COLOR_ORDER>(leds, NUM_LEDS);  // Use this for WS2801 or APA102

  FastLED.setBrightness(max_bright);
} // setup()


void loop() {
  leds[0] = CRGB::Red;
  FastLED.show();
} // loop()

Alternate Assignments

  leds[0] = CRGB(50,0,200);                          // OR
  leds[i].setRGB(50,0,200);

  leds[i] = 0x3F048E;

  leds[i] = leds[j];

  leds[i] += CHSV(mythue, mysat, mybright);           // Add to an existing colour with CHSV value.

  leds[i].r = 128;

  leds[i] = random();                                // Returns a 'long' value. Do not use 'int' values for RGB.