#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
}

void loop() {
  // Step forward 100 steps:
  myStepper.step(100);
  delay(500);

  // Step backward 100 steps:
  myStepper.step(-100);
  delay(500);
}