#include <Servo.h>
Servo myservo;
int pos=0;
void setup() {
  // put your setup code here, to run once:
myservo.attach(9);
}

void loop() {
  // put your main code here, to run repeatedly:
for(pos=0;pos<=180;pos+=1)
{
  myservo.write(pos);
  delay(15);
}
for(pos=180;pos>=0;pos-=1)
{
  myservo.write(pos);
  delay(15);
}
}