#include <Servo.h>
Servo  Servo1;
int Schritt = 30;
int Winkel = 0;
int Richtung = 1; // 1 oder -1


void setup() {
  // put your setup code here, to run once:
 pinMode(3, OUTPUT);
 Servo1.attach(3);

}

void loop() {
  // put your main code here, to run repeatedly:
  Servo1.write (Winkel);
  if (Winkel > 180) {
  Richtung = -Richtung;
  Winkel = 180-Schritt;
  }
  else if (Winkel <0) {
    Richtung = -Richtung;
    Winkel = Schritt;
  }
  Winkel = Winkel + Schritt*Richtung;
  delay(500);

}