#include <Servo.h>
Servo Servo1;
int Wartezeit = 400;
int Schritt = 30;
int Richtung = 1; // 1 oder -1
int Winkel = 0;

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);
 Winkel = Winkel + Schritt*Richtung;
 if (Winkel > 180) {
  Richtung = -Richtung;
  Winkel = 180-Schritt;
 }
  if (Winkel <0) {
  Richtung = -Richtung;
  Winkel = Schritt;
 }
 delay(Wartezeit);
 
}