ANDROID LAND ROVER

void setup()
                     {
                       pinMode(13,OUTPUT);
                       Serial.begin(9600);
                       Serial.print("WELCOME TO EMERGING TECHNOLOGIES");
                       digitalWrite(13,LOW); digitalWrite(12,LOW);digitalWrite(11,LOW); digitalWrite(10,LOW);
                     delay(1000);
                     }
                     void loop()
                     {
                       unsigned char a=Serial.read();
                       if(a=='F')  {digitalWrite(13,HIGH); digitalWrite(12,LOW);digitalWrite(11,HIGH); digitalWrite(10,LOW);  delay(10);}
                       else if(a=='B')  {digitalWrite(13,LOW); digitalWrite(12,HIGH);digitalWrite(11,LOW); digitalWrite(10,HIGH);  delay(10);}
                       else if(a=='L')  {digitalWrite(13,HIGH); digitalWrite(12,LOW);digitalWrite(11,LOW); digitalWrite(10,LOW);  delay(10);}
                       else if(a=='R')  {digitalWrite(13,LOW); digitalWrite(12,LOW);digitalWrite(11,HIGH); digitalWrite(10,LOW);  delay(10);}
                      // if(a=='S')  {digitalWrite(13,LOW); digitalWrite(12,LOW);digitalWrite(11,LOW); digitalWrite(10,LOW);  delay(10);}
                       else if(a=='W')  {digitalWrite(3,HIGH);  delay(10);} //FRONT LIGHT ON
                       else if(a=='w')  {digitalWrite(3,LOW);   delay(10);} //FRONT LIGHT OFF
                       else if(a=='U')  {digitalWrite(4,HIGH);  delay(10);} //BACK LIGHT ON
                       else if(a=='u')  {digitalWrite(4,LOW);   delay(10);} //BACK LIGHT OFF
                       else if(a=='V')  {digitalWrite(2,HIGH);  delay(10);} //HORN ON
                       else if(a=='v')  {digitalWrite(2,LOW);   delay(10);} //HORN OFF
                      else
                      {
                       digitalWrite(13,LOW); digitalWrite(12,LOW);digitalWrite(11,LOW); digitalWrite(10,LOW);
                     }
                     }