#include <Servo.h>

Servo myServo;
int pos = 0;    

void setup() {
  myServo.attach(9);  
  Serial.begin(9600);
}

void loop() {
  for (pos = 0; pos <= 180; pos += 1) {
    myServo.write(pos);
    Serial.print("Servo position: ");
    Serial.println(pos);
    delay(10);
  }
  for (pos = 180; pos >= 0; pos -= 1) {
    myServo.write(pos);
    Serial.print("Servo position: ");
    Serial.println(pos);
    delay(10);  
  }
}