#include <Servo.h>

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position 0 to 180 degrees

void setup() {
   pinMode(12, INPUT_PULLUP);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
  myservo.write(pos); 
  delay(200);
}

void loop() {
  if (digitalRead(12) == LOW) {
    delay(2000);  //delay 2 seconds
  }

  for (pos = 0; pos <=180; pos++) {
    myservo.write(pos); 
    delay(10);
  }
  for (pos = 180; pos >= 0; pos--) {
    myservo.write(pos); 
    delay(10);
  }


}