char IncomingValue = 0;

void setup(){
  Serial.begin(9600);
  pinMode(8, OUTPUT);
}

void loop(){
  if(Serial.available() > 0){
    IncomingValue = Serial.read();
    Serial.println(IncomingValue);
    if(IncomingValue == '1')
      digitalWrite(8, HIGH);
    else if(IncomingValue == '0')
      digitalWrite(8, LOW);
  }               
}