8x8 RGB 64 LED Matrix 5V WS2812b

#include <Adafruit_NeoPixel.h>

#define LED_PIN 6
#define LED_COUNT 64

Adafruit_NeoPixel matrix(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

uint32_t colorFromXY(uint8_t x, uint8_t y) {
  // Simple rainbow-style gradient across the 8x8 matrix.
  uint8_t r = x * 32;
  uint8_t g = y * 32;
  uint8_t b = 255 - (x + y) * 16;
  return matrix.Color(r, g, b);
}

uint16_t xyToIndex(uint8_t x, uint8_t y) {
  // Common serpentine wiring for many 8x8 WS2812 matrices.
  // If your specific module uses a different layout, adjust this mapping.
  if (y % 2 == 0) {
    return y * 8 + x;
  } else {
    return y * 8 + (7 - x);
  }
}

void showDemoPattern() {
  matrix.clear();

  for (uint8_t y = 0; y < 8; y++) {
    for (uint8_t x = 0; x < 8; x++) {
      matrix.setPixelColor(xyToIndex(x, y), colorFromXY(x, y));
    }
  }

  matrix.show();
}

void setup() {
  Serial.begin(115200);
  matrix.begin();
  matrix.setBrightness(40);
  matrix.show(); // Initialize all pixels to off

  Serial.println("8x8 WS2812B matrix demo starting...");
}

void loop() {
  showDemoPattern();
  Serial.println("Showing color gradient on the 8x8 matrix.");
  delay(1000);

  matrix.clear();
  matrix.show();
  Serial.println("Cleared matrix.");
  delay(500);
}