 
   prev_update_time = millis();
 
-  pinMode(13, OUTPUT);
+  pinMode(LED_WORKING_CHECK, OUTPUT);
 
   SerialBT2.begin(57600);
 

  if ((millis()-t_time) >= 500)
  {
    t_time = millis();
    digitalWrite(13, !digitalRead(13));
  }

  if (getPowerInVoltage() < 11.1)

#define LED_RXD         1
#define LED_LOW_BATTERY 2
#define LED_ROS_CONNECT 3
#define LED_WORKING_CHECK 13

/*******************************************************************************
* Declaration for Battery
