// https://forum.arduino.cc/t/default-nano-esp32-rgb-led-sketch/1213384/

#define LED_BUILTIN 13
#define LED_RED 14
#define LED_GRN 15
#define LED_BLU 16
int vDelay = 500;

void setup() {
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GRN, OUTPUT);
  pinMode(LED_BLU, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
}

void toggleLED() {
  delay(vDelay);
  if (digitalRead(LED_BUILTIN) == LOW)
    digitalWrite(LED_BUILTIN, HIGH);
  else
    digitalWrite(LED_BUILTIN, LOW);
}

void colorLED(byte r, byte g, byte b) {
  digitalWrite(LED_RED, r);
  digitalWrite(LED_GRN, g);
  digitalWrite(LED_BLU, b);
  toggleLED();
}

void loop() {
  colorLED(LOW, LOW, LOW);
  colorLED(LOW, LOW, HIGH);
  colorLED(LOW, HIGH, LOW);
  colorLED(HIGH, LOW, LOW);
  colorLED(HIGH, HIGH, LOW);
  colorLED(HIGH, LOW, HIGH);
  colorLED(LOW, HIGH, HIGH);
  colorLED(HIGH, HIGH, HIGH);
}