// https://myhomethings.eu/arduino-ki-es-bemenetek/
int potmeterPin = A0;
int potmeterValue = 0;

void setup()
{
   Serial.begin(9600);
   analogReference(EXTERNAL);
}

void loop()
{
   potmeterValue = analogRead(potmeterPin);
   Serial.println(potmeterValue);
}