#include <SoftwareSerial.h>
SoftwareSerial mySerial(4,3); // RX, TX for bluetooth connectivity 
char ch;
int m11 = 6;
int m12 = 7; 
void setup()  
{
  Serial.begin(9600);
  mySerial.begin(9600);
  pinMode(6, OUTPUT);// motor pins
  pinMode(7, OUTPUT);// motor pins
  digitalWrite(5,HIGH);// enable pins
 digitalWrite(11,HIGH);
}

void loop() 
{
  if (mySerial.available())
  
  {
    ch = mySerial.read(); 
      while(ch == 'F')
      {
        // Move Forward
        Serial.println(ch);
        forward();// call forward loop
        ch = mySerial.read();
      }
      while(ch == 'R')
      {
        // Move Backward
        Serial.println(ch);
        backward();// call backward loop
        ch = mySerial.read();
      } 
  }
}
void forward()
{
  digitalWrite(m11, HIGH);
  digitalWrite(m12, LOW); 
}
void backward()
{digitalWrite(m11, LOW);
  digitalWrite(m12, HIGH);
  }