int tx = 2;
void setup()
{
  pinMode(tx,OUTPUT);
}
//1=0.5µs  2=1µs 3=35µs
void wait(int code){
  if(code==1){
  delayMicroseconds(500);
  }
  if(code==2){
  delayMicroseconds(1000);
  }
  if(code==3){
  delayMicroseconds(5000);
  }
}

void fire(int i)
{
 digitalWrite(tx,i);

}
void i()
{
 fire(1);
 wait(1);
 fire(0);
 wait(2);
 fire(1);
 wait(1);
 fire(0);
 wait(2);
}
void o()//3µs
{
 fire(1);
 wait(1);
 fire(0);
 wait(2);
 fire(1);
 wait(2);
 fire(0);
 wait(1);
}
void sync()
{
  fire(1);
  wait(1);
  fire(0);
  wait(3);
}
void transmit(int one, int two, int three, int four, int five, String c,int on)
{
  if(one==1){ i();  }else{ o(); }
  if(two==1){ i();  }else{ o(); }
  if(three==1){ i();  }else{ o(); }
  if(four==1){ i();  }else{ o(); }
  if(five==1){ i();  }else{ o(); }
  if(c == "a"){ i();  }else{ o(); }
  if(c == "b"){ i();  }else{ o(); }
  if(c == "c"){ i();  }else{ o(); }
  if(c == "d"){ i();  }else{ o(); }
  if(c == "e"){ i();  }else{ o(); }
  if(on==1){ i(); o(); sync();  }else{ o(); i(); sync();  }

}
void snd(int one, int two, int three, int four, int five, String c,int on)
{
  transmit(one,two,three,four,five,c,on);
  transmit(one,two,three,four,five,c,on);
  transmit(one,two,three,four,five,c,on);
  transmit(one,two,three,four,five,c,on);
}

int index;
String chr;
int onx;
void loop()
{
  index = index + 1;
  if(index==1){  chr="a";  }
  if(index==2){  chr="b";  }
  if(index==3){  chr="c";  }
  if(index==4){  chr="d";  }
  if(index==5){  chr="e";  }
  if(index>=6){  index=1; chr="a"; onx=!onx; }

  snd(1,0,0,0,0,chr,onx);
  delay(5);
  snd(0,0,0,0,0,chr,onx);
  delay(5);
  snd(0,1,0,0,0,chr,onx);
  delay(5);
  snd(0,0,1,0,0,chr,onx);
  delay(5);
  snd(0,0,0,1,0,chr,onx);
  delay(5);
  snd(0,0,0,0,1,chr,onx);
  delay(5);
  snd(1,0,0,0,1,chr,onx);
  delay(5);
  snd(1,0,1,0,1,chr,onx);
  delay(5);
  snd(0,1,0,1,0,chr,onx);
  delay(5);
  snd(1,1,1,0,0,chr,onx);
  delay(5);
  snd(0,0,1,1,1,chr,onx);
  delay(5);
  snd(1,1,0,1,1,chr,onx);
  delay(5);
  snd(0,1,1,1,0,chr,onx);
  delay(5);
  snd(1,0,0,0,0,chr,onx);
  delay(5);
  snd(1,1,0,1,0,chr,onx);
  delay(5);
  snd(1,0,1,1,0,chr,onx);
  delay(5);
  snd(1,0,0,1,1,chr,onx);
  delay(5);
  snd(0,1,1,0,0,chr,onx);
  delay(5);


}