#include <Adafruit_NeoPixel.h>

int possiblePins[] = {48, 38, 21, 18, 8, 3};
int totalPins = sizeof(possiblePins) / sizeof(possiblePins[0]);

Adafruit_NeoPixel rgbLED(1, 0, NEO_GRB + NEO_KHZ800);

void setup() {
  Serial.begin(115200);
  delay(2000);

  Serial.println("Scanning GPIO pins for RGB LED...");
}

void loop() {
  for (int i = 0; i < totalPins; i++) {
    int pin = possiblePins[i];
    Serial.print("Testing pin: ");
    Serial.println(pin);

    rgbLED.setPin(pin);
    rgbLED.begin();
    rgbLED.setBrightness(20);
    rgbLED.setPixelColor(0, rgbLED.Color(255, 0, 0));  // RED
    rgbLED.show();

    delay(500);

    rgbLED.clear();
    rgbLED.show();
    delay(200);

    // If you visually see the LED blink, print success:
    Serial.print("👉 If LED blinked, RGB LED pin is: ");
    Serial.println(pin);
  }

  Serial.println("Scan Complete. Restarting...");
  delay(2000);
}