fill_gradient_examples.ino

// There are multiple examples below showing the use of
//   fill_gradient, and fill_gradient_RGB
//
// Un-comment examples one at a time to experiment.
//
// Note1:
//   When filling all the way to the end always use NUM_LEDS-1.
//   (If you don't subtract 1 then it will break things.)
//
// Note2:
//   When using fill_gradient_RGB, do NOT include gradient direction
//   info (FORWARD_HUES, BACKWARD_HUES, SHORTEST_HUES, LONGEST_HUES)
//
// Marc Miller,  Nov 2016
//---------------------------------------------------------------

#include "FastLED.h"
#define LED_TYPE WS2812B
#define DATA_PIN 11
//#define CLOCK_PIN 13
#define NUM_LEDS 12
#define COLOR_ORDER GRB
#define MASTER_BRIGHTNESS 180
CRGB leds[NUM_LEDS];

CHSV gsHSV(0,255,255);  // grad start color in HSV format
CHSV geHSV(128,255,255);  // grad end color in HSV format

CRGB gsRGB(255,0,0);  // grad start color in RGB format
CRGB geRGB(0,255,0);  // grad end color in RGB format

uint8_t num = 0;  // stores a number when animating grad

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

//---------------------------------------------------------------
void loop() {
  EVERY_N_MILLISECONDS(250) {
    num = num + 4;
    Serial.print(" num = "); Serial.println(num);
  
    /* ---------------Fill gradient using HSV format---------------
    * All three of these display the same output.
    *   The first inputs the color directly in HSV values.
    *   The second uses the HSV colors defined up above.
    *   The third uses the HSV colors defined up above and shows how to break out the h,s,v parts.
    * These gradients are static.
    */
    
    fill_gradient(leds, 0, CHSV(0,255,255), NUM_LEDS-1, CHSV(128,255,255), SHORTEST_HUES);
    //fill_gradient(leds, 0, gsHSV, NUM_LEDS-1, geHSV, SHORTEST_HUES);
    //fill_gradient(leds, 0, CHSV(gsHSV.h,gsHSV.s,gsHSV.v), NUM_LEDS-1, CHSV(geHSV.h,geHSV.s,geHSV.v), SHORTEST_HUES);


    
    /*----------- 
    * This shows how you could operate on the r,g,b parts of a previously defined
    *   HSV color, or only use some combination of the h, s, or v components.
    * This gradient is animated.
    */

    //fill_gradient(leds, 0, CHSV(gsHSV.h+num, random8(100,256), gsHSV.v), NUM_LEDS-1, CHSV(geHSV.h+num, geHSV.s, random8(180,256)), SHORTEST_HUES);




    /* ---------------Fill gradient using RGB format---------------
    * All three of these display the same output.
    *   The first inputs the color directly in RGB values.
    *   The second uses the RGB colors defined up above.
    *   The third uses the RGB colors defined up above and shows how to break out the h,s,v parts.
    * These gradients are static.
    * *Note* Do NOT use SHORTEST_HUES on the end.
    */
    
    //fill_gradient_RGB(leds, 0, CRGB(255,0,0), NUM_LEDS-1, CRGB(0,255,0));
    //fill_gradient_RGB(leds, 0, gsRGB, NUM_LEDS-1, geRGB);
    //fill_gradient_RGB(leds, 0, CRGB(gsRGB.r, gsRGB.g, gsRGB.b), NUM_LEDS-1, CRGB(geRGB.r, geRGB.g, geRGB.b));


    /*---------- 
    * This shows how you could operate on the r,g,b parts of a previously defined
    *   RGB color, or only use some combination of the r, g, or b components.
    * This gradient is animated.
    */

    //fill_gradient_RGB( leds, 0, CRGB(gsRGB.r+num, gsRGB.g, 255), NUM_LEDS-1, CRGB(0, geRGB.g+num, random8(0,64)) );



    FastLED.show();  //display the pixels
  }
  
}//end main loop