LED color fade

maybe_color_transition

//***************************************************************
// Example of blending from one color to a target color.
// Once the target color is reached a new random target color
// is picked to blend toward.
//
// leds[0] always displays the target color.
//
// Marc Miller, Feb 2017
//***************************************************************

#include "FastLED.h"
#define DATA_PIN    11
#define LED_TYPE    WS2811_400
#define COLOR_ORDER GRB
#define NUM_LEDS    240
#define BRIGHTNESS  100
CRGB leds[NUM_LEDS];


uint8_t blendRate = 5;  // How fast to blend.  Higher is slower.  [milliseconds]

CHSV colorStart = CHSV(); // starting color

CHSV colorStart2 = CHSV(); // starting color
CHSV colorTarget = CHSV(); // target color
CHSV colorCurrent = colorStart;      //defines colorCurrent


//---------------------------------------------------------------
void setup() {
  Serial.begin(115200);  // Allows serial monitor output (check baud rate)
  delay(3000); // 3 second delay for recovery

  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  FastLED.setBrightness(BRIGHTNESS);

}


//---------------------------------------------------------------
void loop()
{
  EVERY_N_MILLISECONDS(blendRate) {
    static uint8_t k;
     colorStart = CHSV(5, 255, 255); //red

    if ( colorCurrent == colorTarget ) {  // Check if target has been reached
      colorTarget = CHSV(85, 255, 255); //green
      colorStart = colorCurrent;
      k = 0;  // reset k value
      Serial.print("New colorTarget:\t\t\t"); Serial.println(colorTarget.h);

   }

      colorStart =CHSV(5, 254, 255); //green

  if ( colorCurrent == colorTarget ) {  // Check if target has been reached
      colorTarget = CHSV(85, 255, 255); //red
      colorStart = colorCurrent;
      
      k = 0;  // reset k value
  }

    colorCurrent = blend(colorStart, colorTarget, k, SHORTEST_HUES);
    fill_solid( leds, NUM_LEDS, colorCurrent );
    leds[0] = colorTarget;  // set first pixel to always show target color
    Serial.print("colorCurrent:\t"); Serial.print(colorCurrent.h); Serial.print("\t");
    Serial.print("colorTarget:\t"); Serial.print(colorTarget.h);
    Serial.print("\tk: "); Serial.println(k);
    k++;
  }

  FastLED.show();  // update the display
}

//---------------------------------------------------------------