void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(11, OUTPUT);
  pinMode(6,OUTPUT);
}

void loop() {
  while (Serial.available())
{
  char inChar = Serial.read();
  if (inChar == '1')
  {
    digitalWrite(11, HIGH);
    tone(6, 4000);
    Serial.print("led on");
  } else if (inChar == '0')
  {
    digitalWrite(11, LOW);
    noTone(6);
  }
}
}