!highlight!// Mohamadi & Abasi
#include <SoftwareSerial.h>
#define led1 13
#define led2 12
#define led3 11
/* Create object named bt of the class SoftwareSerial */ 
SoftwareSerial bt(2,3); /* (Rx,Tx) */  

void setup() {
  bt.begin(9600);  /* Define baud rate for software serial communication */
  Serial.begin(9600);  /* Define baud rate for serial communication */
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

}
char flag1 = 0;
char flag2 = 0;
char flag3 = 0;
void loop() {
    if (bt.available())  /* If data is available on serial port */
    {
      unsigned char a = bt.read();
      Serial.write(a);  /* Print character received on to the serial monitor */
      if(a == '1'){
        if(flag1 == 0){
          Serial.print("karim");
          digitalWrite(11, HIGH);
          flag1 = 1;
        }
        else{
          digitalWrite(11, LOW);
          flag1 = 0;
        }
      }
      if(a == '2'){
        if(flag2 == 0){
          digitalWrite(12, HIGH);
          flag2 = 1;
        }
        else{
          digitalWrite(12, LOW);
          flag2 = 0;
        }
      }
      if(a == '3'){
        if(flag3 == 0){
          digitalWrite(13, HIGH);
          flag3 = 1;
        }
        else{
          digitalWrite(13, LOW);
          flag3 = 0;
        }
      }
    }
}