#include <Adafruit_NeoPixel.h>

#define PIN 4       // GPIO4, change this to your desired pin
#define NUM_LEDS 16  // Number of NeoPixel LEDs in the strip

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

void setup() {
    strip.begin();
    strip.show();  // Initialize all pixels to 'off'
}

void loop() {
    colorWipe(strip.Color(255, 0, 0), 50);  // Red
    colorWipe(strip.Color(0, 255, 0), 50);  // Green
    colorWipe(strip.Color(0, 0, 255), 50);  // Blue
    rainbow(10);  // Rainbow effect
}

// Fill LEDs one by one with a color
void colorWipe(uint32_t color, int wait) {
    for (int i = 0; i < strip.numPixels(); i++) {
        strip.setPixelColor(i, color);
        strip.show();
        delay(wait);
    }
}

// Rainbow animation
void rainbow(int wait) {
    for (long firstPixelHue = 0; firstPixelHue < 65536; firstPixelHue += 256) {
        for (int i = 0; i < strip.numPixels(); i++) {
            int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels());
            strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
        }
        strip.show();
        delay(wait);
    }
}