const char on[] = "qwertyui";
const char off[] = "asdfghjk";
const char ELpin[] = {2,3,4,5,6,7,8,9};

void setup()
{
  char x;
  
  Serial.begin(9600);
  
  for (x = 0; x <= 7; x++)
    pinMode(ELpin[x],OUTPUT);
    
  pinMode(13,OUTPUT);
}

void loop()
{
  char incoming, x;
  
  if (Serial.available())
  {
    incoming = Serial.read();
    
    for (x=0; x<=7; x++)
    {
      if (incoming == on[x])
      {
        digitalWrite(ELpin[x],HIGH);
        Serial.print(ELpin[x],DEC);
        Serial.println(" on");
      } 
      if (incoming == off[x])
      {
        digitalWrite(ELpin[x],LOW);
        Serial.print(ELpin[x],DEC);
        Serial.println(" off");
      } 
    }
    digitalWrite(13,HIGH);
    delay(10);
    digitalWrite(13,LOW);
  }
}