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const int relayPin = 13;
const int soundSensorPin = 2;
int soundState = 0;
int lastSoundState = 0;

void setup() {
  pinMode(relayPin, OUTPUT);
  pinMode(soundSensorPin, INPUT);
}

void loop() {
  soundState = digitalRead(soundSensorPin);
  if (soundState == HIGH && lastSoundState == LOW) {
    digitalWrite(relayPin, !digitalRead(relayPin));
    delay(200);
  }
  lastSoundState = soundState;
}