#include <Servo.h>
Servo myservo;
int potentioPIN = A0;
int value;
void setup()
{
  myservo.attach(9);
}
void loop()
{
  value=analogRead(potentioPIN);
  value = map(value,0,1023,0,180);
  myservo.write(value);
  delay(1000);
  value=map(value,1023,0,180,0);
  myservo.write(value);
  delay(1000);
}