#include <Stepper.h>
int steps=800;
int speed=360;
int dir = 1;

const int dir_pin = 2;
const int step_pin = 3;
Stepper mystepper= Stepper(200, step_pin, dir_pin);

void setup() {
  mystepper.setSpeed(speed);
}

void loop() {
mystepper.step(dir*steps);
delay(1000);
mystepper.step(-1*dir*steps);
delay(1000);
}