void setup() {

  // initialize serial communication:

  Serial.begin(9600);
    Serial.println("Mohamed Geasa");
  // initialize the LED pins:

  for (int thisPin = 2; thisPin < 7; thisPin++) {

    pinMode(thisPin, OUTPUT);

  }
}

void loop() {

 
  if (Serial.available() > 0) {

    int inByte = Serial.read();


    switch (inByte) {

      case 'a':

        digitalWrite(2, HIGH);

        break;

      case 'b':

        digitalWrite(3, HIGH);

        break;

      case 'c':

        digitalWrite(4, HIGH);

        break;

      case 'd':

        digitalWrite(5, HIGH);

        break;

      case 'e':

        digitalWrite(6, HIGH);

        break;
       case 'off':
              
              for (int thisPin = 2; thisPin < 7; thisPin++) {

          digitalWrite(thisPin, LOW);

        }




      

      default:

        // turn all the LEDs off:

        for (int thisPin = 2; thisPin < 7; thisPin++) {

         // digitalWrite(thisPin, LOW);

        }

    }

  }
}