const int HALL_PIN = A0;

void setup() {
  Serial.begin(9200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(HALL_PIN, INPUT);
}

void loop() {
  int hall_value = analogRead(HALL_PIN);
  Serial.println(hall_value);
  // digitalWrite(LED_BUILTIN, hall_value); 
  delay(10); //debounce? 
}