int InData;

void setup()

{

  pinMode(8, OUTPUT);

  InData = 0;

  digitalWrite(8, LOW);

  Serial.begin(9600);

}

void loop()

{

  if (Serial.available() > 0) {

    InData = Serial.read();

    Serial.print("I received:");

    Serial.println(InData);

  }

  if (InData == 97) {

    digitalWrite(8, HIGH);

  } else if (InData == 98) {

    digitalWrite(8, LOW);

  }

}