#include <Servo.h>
Servo myservo;
int i = 0;
int smer = 1;
void setup() {
myservo.attach(5);
Serial.begin(9600);
}

void loop() {
myservo.write(i);
delay(100);
i = i + smer;
if(i==180||i==0){
  smer = - smer;
}
Serial.println(i);
}