#include <Servo.h>
int i=1;
int smer=1;

Servo Servomotorcek;
void setup() {
  Servomotorcek.attach(12);
  Servomotorcek.write(0);
}

void loop() {

  Servomotorcek.write(i);
   delay(10);
  if (i==0 || i==180){
    smer=-smer;
  }
  i=i+smer;
}