#include <Servo.h>
Servo myservo; 
int potpin = 0; 
int val;   
void setup() {
  myservo.attach(9);
}
void loop() {
  val = analogRead(potpin);       
  val = map(val, 0, 1023, 0, 180);    
  myservo.write(val);            
  delay(15);              
}