#include <Servo.h>  

#define SERVO_PIN 9  
#define LED_PIN 13   

Servo servo; 
int pos = 0; 

void setup() {
  pinMode(LED_PIN, OUTPUT);  
  servo.attach(SERVO_PIN);  
}

void loop() {
  digitalWrite(LED_PIN, HIGH);  

  // Rotate the servo from 0 to 180 degrees
  for (pos = 0; pos <= 180; pos += 1) {
    servo.write(pos); 
    delay(10);        
  }

  // Rotate the servo back from 180 to 0 degrees
  for (pos = 180; pos >= 0; pos -= 1) {
    servo.write(pos); 
    delay(10);        
  }

  digitalWrite(LED_PIN, LOW); 
  delay(1000);  
}