analog LED strip blend

#include "FastLED.h"

#define REDPIN   5
#define GREENPIN 6
#define BLUEPIN  3

// blend() below can take two CRGB or CHSV colors
// CRGB color1 = CRGB(255, 0, 0);
// CRGB color2 = CRGB(0, 0, 255);

// the output of blend() needs to be CRGB to pass to
// showAnalogRGB() below
CRGB color_current;

CHSV color1 = CHSV(0, 255, 255);
CHSV color2 = CHSV(180, 255, 255);

void showAnalogRGB( const CRGB& rgb)
{
  analogWrite(REDPIN,   rgb.r );
  analogWrite(GREENPIN, rgb.g );
  analogWrite(BLUEPIN,  rgb.b );
}
 
 
void setup()
{

  Serial.begin(9600);
  pinMode(REDPIN, OUTPUT);
  pinMode(BLUEPIN, OUTPUT);
  pinMode(GREENPIN, OUTPUT);
  
  // prints a first "header" for easy .csv copy/paste from serial monitor
  // to Excel/LibreOffice
  Serial.println("r,g,b");
}

void loop()
{

  // looks like the third parameter of blend is an int between 0-255 for 
  // what % of color2 to use (corresponding to 0-100%). To fiddle with steps/speed
  // you could change what i stops at (< 255 or not all the way), the increment
  // (use i = i+n instead of i++), or just play with the delay() at the end.
  // You could also wrap in EVERY_N_MILLISECONDS(n){} if you need to multitask
  for(int i = 0; i < 255; i++) {

    color_current = blend(color1, color2, i);
    showAnalogRGB(color_current);

    // uncomment to capture the raw RGB values
    /*  
    Serial.print(color_current.r);
    Serial.print(",");
    Serial.print(color_current.g);
    Serial.print(",");
    Serial.print(color_current.b);
    Serial.println(",");
    */

    // change to set the blend time
    delay(20);

  }

}