#include <Servo.h>
Servo myServo;
int potPin=0;
int value;
void setup() {
  myServo.attach(9);
}

void loop() {
  //potentionmeter value is between 0 to 1023
  value=analogRead(potPin);
  //scale potention meter with servo value (0 to 180)
  //map 1023 to 180 degree.
  value = map(value,0,1023,0,180);
  myServo.write(value);
  delay(50);
}