const int correct_rgb_pin = 38;

void setup() {
  Serial.begin(115200);
  Serial.print("Neopixel-GPIO is ");
  Serial.println(correct_rgb_pin);
}

void loop() {
    neopixelWrite(correct_rgb_pin, 255,0,0);
    delay(500);
    neopixelWrite(correct_rgb_pin, 0,255,0);
    delay(500);
    neopixelWrite(correct_rgb_pin, 0,0,255);
    delay(500);
}