Two breakout boards designed in KiCad.

Both feature reverse-mounted addressable RGB LED LTST-A683CEGBW.

Both are hot-swap capable (Kailh Socket / Mill-Max 7305).

Total board dimensions: 26 x 19 mm.

#include "FastLED.h"
const int ledPin = 6;
const int buttonPin = 7;

int ledHue = 0;
const int ledSaturation = 255;
const int ledBrightness = 255;

CRGB leds[1];

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  FastLED.addLeds<WS2811, ledPin>(leds, 1);
}

void loop() {
  if(digitalRead(buttonPin) == LOW) ledHue++;

  leds[0].setHSV(ledHue, ledSaturation, ledBrightness);
  FastLED.show();
}