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

void setup() {
myservo.attach(2);

}

void loop() {
 myservo.write(0);
 delay(300);
 myservo.write(180);
 delay(300);
 myservo.write(0);
 delay(300);
}

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

{
myser.attach(2);

}

{
 myser.write(0);
 delay(300);
 myser.write(180);
 delay(300);
 myser.write(0);
 delay(300);
}