const int pingPin = 11;
     int inPin = 12;
     int duration, cm,val,val2;
     int cmx[10];
     double mil;
     String strz;
     #include <SoftwareSerial.h>
   //  #include <EEPROM.h>

    SoftwareSerial mySerial1(2, 3); // RX, TX

 
    void setup() {
      Serial.begin(9600);
      mySerial1.begin(9600);
         pinMode(pingPin, OUTPUT);
         pinMode(inPin,INPUT_PULLUP);
       pinMode(13, OUTPUT);
       digitalWrite(13,LOW);
    }

void send_data()
{
         digitalWrite(13,HIGH);delay(100);
      mySerial1.print("LV");
      mySerial1.print(cm<10 ?"00":cm<100?"0":"" ); mySerial1.println(cm); 
      
         delay(10);
       digitalWrite(13,LOW);
      
  }
     
    void loop()
    {
     if (millis()-mil>1000)
     { 
      mil=millis();
   
    
      cm=0;
      for (int i=0;i<5 ;i++)
      {
      digitalWrite(pingPin, LOW);
      delayMicroseconds(2);
      digitalWrite(pingPin, HIGH);
      delayMicroseconds(5);
      digitalWrite(pingPin, LOW);
      pinMode(inPin, INPUT);
      duration = pulseIn(inPin, HIGH);

      cm =cm+ microsecondsToCentimeters(duration);
      delay(200);
      }
       cm=cm/5;

   




      
    //  Serial.print("LV55");
    //  Serial.print(cm<10 ?"00":cm<100?"0":"" ); Serial.println(cm); 
     // send_data();
     }
     
      
    if  (mySerial1.available())   mySerial1Event();
     
    }
     
    long microsecondsToCentimeters(long microseconds)
    {
      // The speed of sound is 340 m/s or 29 microseconds per centimeter.
      // The ping travels out and back, so to find the distance of the
      // object we take half of the distance travelled.
      return microseconds / 29 / 2;
    }


void mySerial1Event()
{
  while (mySerial1.available()) {
    
         char  inChar =(char)mySerial1.read();
          strz += inChar;     
      
           if (inChar == '\n' || inChar == '\r')
            {   
               Serial.println(strz);
             if (strz[0]=='B' && strz[1]=='1'  ) send_data();
             
            strz="";
            }
  } 
}