const int sensorPin = D1;

void setup() {
  Serial.begin(115200);
  pinMode(sensorPin, INPUT);
  delay(1000);
  Serial.println("RCWL test start");
}

void loop() {
  int state = digitalRead(sensorPin);

  if (state == HIGH) {
    Serial.println("GOAL!");
  } else {
    Serial.println("0");
  }

  delay(500);
}