#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 <= 45; pos +=1){
    myservo.write(pos);
    delay(15);
  }

  for(pos =50; pos >= 0; pos -=1){
    myservo.write(pos);
    delay(15);
  }

}