#include <Servo.h>
Servo myservo;        

int potenpin = 0;           //analog potentiometer pin
int pos;                    //variable to read analog potentiometer pin

void setup() {

  myservo.attach(9);   

}

void loop() {
  
  pos = analogRead(potenpin);      //reads from analog potentiometer pin
  pos = map(pos, 0, 1023, 0, 180); //(scale 0-->1023) (angle 0-->180)
  myservo.write(pos);  
  delay(15);          

}