#include <Servo.h>

#define servoPin 3
#define potPin A0

Servo myServo;

void setup() {
  pinMode(potPin, INPUT);
  myServo.attach(servoPin);
}

void loop() {
  int servoPosition = map(analogRead(potPin), 0, 1023, 0, 180);
  myServo.write(servoPosition);
  delay(10);
}