#include <Servo.h>
Servo myservo;  
int pot = A0;  
int val;

void setup() {
 pinMode(A0, INPUT);
  myservo.attach(9); 
}
void loop() {
  val = analogRead(pot);            
 Serial.println(val);
  val = map(val, 0, 1023, 0, 180);     
  myservo.write(val);                 
  delay(15);                          
}