Fire RGB LED

#include <M5Unified.h>
#include <Adafruit_NeoPixel.h>

#define LED_PIN 15
#define NUM_LEDS 10

Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  auto cfg = M5.config();
  M5.begin(cfg);
  M5.Display.setTextDatum(middle_center);
  M5.Display.setTextFont(&fonts::Orbitron_Light_24);
  M5.Display.setTextSize(1);
  M5.Display.drawString("RGB LED Test", M5.Display.width() / 2, M5.Display.height() / 2);
  strip.begin();
  strip.show();
}

void loop() {
  // Red
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(255, 0, 0)); }
  strip.show();
  delay(500);

  // Green
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(0, 255, 0)); }
  strip.show();
  delay(500);

  // Blue
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(0, 0, 255)); }
  strip.show();
  delay(500);

  // Yellow
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(255, 255, 0)); }
  strip.show();
  delay(500);

  // Magenta
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(255, 0, 255)); }
  strip.show();
  delay(500);

  // Cyan
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(0, 255, 255)); }
  strip.show();
  delay(500);

  // White (all on)
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(255, 255, 255)); }
  strip.show();
  delay(500);

  // Black (all off)
  for (char i = 0; i <= NUM_LEDS; i++) { strip.setPixelColor(i, strip.Color(0, 0, 0)); }
  strip.show();
  delay(500);
}