Hack Arduino Leonardo RX/TX LED

Use all LED on the Arduino Leonardo

int led = 13;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(led, OUTPUT);       
  }

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
  RXLED1;
  TXLED1;
  delay(300);               // wait for a second
  
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  RXLED0;
  TXLED0;
  delay(300);               // wait for a second
}