#include <Servo.h>

Servo myServo;  

const int potPin = A0;  
const int servoPin = 9; 

void setup() {
  myServo.attach(servoPin);  
}

void loop() {
  int potValue = analogRead(potPin);  
  int angle = map(potValue, 0, 1023, 0, 180);  

  myServo.write(angle);  
  delay(15);  
}