#include <Stepper.h>

int stepsPerRevolution = 200;

Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  
  myStepper.setSpeed(60);
  
}

void loop() {
  
  myStepper.step(stepsPerRevolution);
  delay(500);

  myStepper.step(-stepsPerRevolution);
  delay(500);
}