#include <Servo.h>

Servo servo_test;

int angle = 0;

void setup()
{
  servo_test.attach(9);
}

void loop()
{
  for(angle = 0; angle < 180; angle += 1)
  {
    servo_test.write(angle);
    delay(15);
  }

  delay(1000);

  for(angle = 180; angle>=1; angle-=5)
  {
    servo_test.write(angle);
    delay(5);
  }

    delay(1000);
}