https://medium.com/jungletronics/wolfram-reading-potentiometer-6149e100be8a

AnalogReadPot.ino

/*
  AnalogReadPot

  Reads an analog input on pin 0, prints the result to the Serial Monitor.
  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/AnalogReadSerial
*/

// potentiometer connection pin
int potPin = 1;
// val is returned integer numbers
int val = 0;

// the setup routine runs once when you press reset:
void setup() {
  pinMode(potPin, INPUT);
  // initialize serial communication at 115200 bits per second:
  Serial.begin(115200);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 1:
  val = analogRead(potPin);
  // return out the value you read in byte size: 1023/4
  Serial.write(val/4);
  // delay in between reads for stability
  //delay(10);        
  }