servo and led

 // C++ code

//

#include <Servo.h>

int angle = 0;

int i = 0;

Servo servo_9;

void setup()

{

  pinMode(5, OUTPUT);

  servo_9.attach(9, 500, 2500);

  pinMode(4, OUTPUT);

  angle = 0;

}

void loop()

{

  while (angle < 180) {

    angle += 1;

    digitalWrite(5, HIGH);

    servo_9.write(angle);

  }

  delay(2000); // Wait for 2000 millisecond(s)

  if (angle == 180) {

    digitalWrite(5, LOW);

  }

  while (angle > 0) {

    angle += -1;

    digitalWrite(4, HIGH);

    servo_9.write(angle);

  }

  delay(2000); // Wait for 2000 millisecond(s)

  digitalWrite(4, LOW);

}