#include <Servo.h>

#define PIN_SERVO1  9

Servo servo1;  // erzeuge servo ein Servo Objekt

int grad;

void setup() {
  servo1.attach(PIN_SERVO1);
}

void loop() {
  for ( grad = 0; grad < 180; grad++ ) {
    servo1.write ( grad );
    delay ( 25 );
  }
  for ( grad = 180; grad >= 0; grad-- ) {
    servo1.write ( grad );
    delay ( 25 );
  }
}