#define SENSOR A0
#define LED D2
#define BUZZER D3

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

void loop() {
  int value = analogRead(SENSOR);
  Serial.println(value);

  if (value > 500) {   // threshold
    digitalWrite(LED, HIGH);
    digitalWrite(BUZZER, HIGH);
  } else {
    digitalWrite(LED, LOW);
    digitalWrite(BUZZER, LOW);
  }

  delay(300);
}