Arduino alkışla çalışan led (lamba)

int led = 13;
int mic;
bool degistir = 1;
void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  mic = analogRead(A0);
  if (mic > 500) {
    digitalWrite(led, degistir);
    degistir = !degistir;
    delay(1000);
  }
  Serial.println(mic);
}