Single Pixel Gradient Coding Hard to Find - For Diorama

Hi

I am a completely new coder and am trying to wire up single Flora NeoPixel Smart 2 into a diorama. I need the lights to go off in sequence as if it were a nuclear bomb.
I am trying to get

White

White

gradient to fade through the spectrum of orange to yellow to black.

I have the first two flashes but is this last one even possible? I have looked up so many examples of coding gradient in the last six hours and tried a lot of different ones but they’re all for a strip of NeoPixels and seem to complicate it thoroughly.
I have been tinkering with the sample simple NeoPixel coding.

If anyone could and wants to help I’d be really grateful but I understand I might have wilder ideas than I am ready to execute with my currently slim knowledge. :confused:

This is the code I have currently:

// NeoPixel Ring simple sketch (c) 2013 Shae Erisson
// Released under the GPLv3 license to match the rest of the
// Adafruit NeoPixel library

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
 #include <avr/power.h> // Required for 16 MHz Adafruit Trinket
#endif

// Which pin on the Arduino is connected to the NeoPixels?
#define PIN        5 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 1 // Popular NeoPixel ring size

// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. Note that for older NeoPixel
// strips you might need to change the third parameter -- see the
// strandtest example for more information on possible values.
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels

void setup() {
  // These lines are specifically to support the Adafruit Trinket 5V 16 MHz.
  // Any other board, you can remove this part (but no harm leaving it):
#if defined(__AVR_ATtiny85__) && (F_CPU == 16000000)
  clock_prescale_set(clock_div_1);
#endif
  // END of Trinket-specific code.

  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
}

void loop() {
  pixels.clear(); // Set all pixel colors to 'off'

  // The first NeoPixel in a strand is #0, second is 1, all the way up
  // to the count of pixels minus one.
  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...

    // pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
    // Here we're using a moderately bright green color:
    pixels.setPixelColor(i, pixels.Color(243, 255, 255));

    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop
    

    pixels.setPixelColor(i, pixels.Color(0, 0, 0));
    
    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop
    
    
    pixels.setPixelColor(i, pixels.Color(255, 255, 255));

    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop
    

    pixels.setPixelColor(i, pixels.Color(0, 0, 0));
    
    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop

    #define DELAYVAL 900 // Time (in milliseconds) to pause between pixels

    pixels.setPixelColor(i, pixels.Color(255, 68, 0));
   
    pixels.show();   // Send the updated pixel colors to the hardware.
    
    delay(DELAYVAL); // Pause before next pass through loop


    pixels.setPixelColor(i, pixels.Color(0, 0, 0));
    
    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop

    #define DELAYVAL 1500 // Time (in milliseconds) to pause between pixels

  }
}

Welcome to the forums. +1 Karma for using code tags with your first post!

As for your code, Orange = 255, 128, 0 (RGB) and Yellow = (255, 255, 0) so to fade from Orange to Yellow, you will need to increase the G channel using a for() loop. Then fade to black (0,0,0)

    // fade orange to yellow
    for(int green = 128; green < 256; ++green ) {
      pixels.setPixelColor(i, pixels.Color(255,green,0);
      pixels.show();
      delay(100);
    }
    // fade yellow to black
    for(int green = 255; green >= 0; --green ) {
      pixels.setPixelColor(i, pixels.Color(green,green,0);
      pixels.show();
      delay(100);
    }