#include <Servo.h>
Servo mymotor;
int pos = 0;

void setup() {
  mymotor.attach(9);
  

}

void loop() {
  for (pos = 0; pos <= 180; pos += 1)
   mymotor.write(pos);
   delay(2000);
  for (pos = 180; pos >= 0; pos -= 1) 
   mymotor.write(pos);
   delay(2000);
  

}