#include <FastLED.h>

#define NUM_LEDS 14
#define BRIGHTNESS 255
#define DATA_PIN 4
CRGB led[NUM_LEDS];
byte color;
byte direction = 1;

void setup() {
  Serial.begin(115200);
  FastLED.addLeds<WS2812, DATA_PIN, GRB>(led, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  if (color > 256 || color < 127)
    direction = -direction;
  color += direction;
  for (byte i = 0; i < NUM_LEDS; i++)
    led[i] = CRGB(color * .9, 0, 0); // iris
  led[0] = CRGB(255, 0, 0); // right pupil
  led[7] = CRGB(0, map(color, 127, 255, 191, 127), 0); // left pupil
  FastLED.show();
  delay(10);
}

sketch.ino

diagram.json

# Wokwi Library List
# See https://docs.wokwi.com/guides/libraries

# Automatically added based on includes:
FastLED



libraries.txt

capacitor1000uf

capacitor1000uf.chip.json

// Wokwi Custom Chip - For docs and examples see:
// https://docs.wokwi.com/chips-api/getting-started
//
// SPDX-License-Identifier: MIT
// Copyright 2023 

// #include "wokwi-api.h"
// #include <stdio.h>
// #include <stdlib.h>

typedef struct {
  // TODO: Put your chip variables here
} chip_state_t;

void chip_init() {
  // chip_state_t *chip = malloc(sizeof(chip_state_t));

  // TODO: Initialize the chip, set up IO pins, create timers, etc.

  // printf("Hello from custom chip!\n");
}
