#include<Servo.h>
Servo myservo; //create servo object to control a servo

int potpin=0; // analogpin used to connect the potentiometer
int val; //variable to read the value from the analog pin
void setup()
{
  myservo.attach(9); //attaches the servo on pin 9 to the servo object
}
void loop()
{
 val = analogRead(potpin); //read potentiometer value
 val= map(val, 0, 1023, 0, 180); //scale it to use it with the servo 
 myservo.write(val); //sets the servo position according to the scaled value
 delay(15); //waits for the servo to get there
}