#include <Servo.h>
Servo Myservo;
int pos = 0;
int LED = 4;

void setup() {
  Myservo.attach(3);
  pinMode(LED, OUTPUT);
}

void loop() {
  for (pos = 0; pos <= 180; pos += 3) {
    Myservo.write(pos);
    delay(50);
    digitalWrite(LED, HIGH);
  }

  for (pos = 180; pos >= 0; pos -= 1) {
    Myservo.write(pos);
    delay(50);
    digitalWrite(LED, LOW);
  }

}