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

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