// Libraries
#include <Servo.h>

// Global Variables
Servo servo;
int rotatePin = A0;

void setup() {
  // Attach the potentiometer
  pinMode(rotatePin, INPUT);

  // Attach the servo
  servo.attach(9);

  // Start the Serial Monitor
  Serial.begin(9600);
}

void loop() {
  // Read the rotation of the potentiometer
  int rotation = analogRead(rotatePin);

  // Convert the value from analog reading to rotation
  rotation = map(rotation, 0, 1023, 0, 180);
  Serial.println(rotation);

  // Rotate the servo
  servo.write(rotation);

  // Wait a short time, to save power
  delay(0.05);
}