   // unused pins
   pinMode(LED_PIN, OUTPUT);
   digitalWrite(LED_PIN, LOW);
-  pinMode(2, INPUT_PULLUP);
-  pinMode(3, INPUT_PULLUP);
   pinMode(4, INPUT_PULLUP);
   pinMode(5, INPUT_PULLUP);
   pinMode(6, INPUT_PULLUP);

  pulsePin(AUX_PIN, 20);

  // servo controller
  pwm.begin();
  pwm.setPWMFreq(50);  // servos run at ~50 Hz updates
  
  // host communication //
  Serial.begin(38400);

  else
  if (cmd == 'p') power();
  else
  if (cmd == 's') servo_maestro();
  else
  if (cmd == 'b') battery();
  else
  if (cmd == 'v') Serial.println("v7");
  else
  if (cmd == 'r') _read();
  else
