 static const byte sDecrPin = 21; // A3
 static const byte sIncrPin = 22; // A4
 static const byte sGndPin  = 23; // A5
+static const byte sLedPin  = 13; // LED
 
 ToggleButton<sModePin> sModeButton;
 ToggleButton<sIncrPin> sIncrButton;


// -----------------------------------------------------------------------------
// Hardware Mapping - Arduino Leonardo

template<int Pin>
class ToggleButton : public Bounce

    {
        pinMode(sOutputPins[i], OUTPUT);
    }
#if ENABLE_SERIAL
    Serial.begin(115200);
    while (!Serial);
    Serial.print("Ready. Running mode: ");
    Serial.println(sRunningMode ? "manual" : "automatic");
#else
    pinMode(sLedPin, OUTPUT);
#endif
}

void loop()
