//Nome:Estrela José Marcolino

#include<Stepper.h>

const int stepPerRevolution=200;

Stepper myStepper(stepPerRevolution, 18, 19, 20, 21);

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

void loop() {
myStepper.step(stepPerRevolution);
delay(500);
myStepper.step(-stepPerRevolution);
delay(500);
}