#include <Servo.h> 
#define SERVO_PIN 3 //define as a constant the SERVO PIN
Servo Servo1; 
int Zeit = 800;
int Winkel =0;
int Schritt = 30;

void setup() {
pinMode(SERVO_PIN, OUTPUT); //setup the pin as output
Servo1.attach(SERVO_PIN);    
Serial.begin(9600);

}

void loop() {
 Servo1.write(Winkel);
 delay(Zeit);
 Serial.println(Winkel);
 if (Winkel >= 180) {
   Schritt = -Schritt;
 }
  if (Winkel < 0) {
   Schritt = -Schritt;
 }
 Winkel = Winkel + Schritt;
}