#include <Stepper.h>
const int stepsPerRevolution = 50;
const int rpm = 1;
Stepper stepper1 = Stepper(stepsPerRevolution, 8, 10, 9, 11);

void setup() {
  stepper1.setSpeed(rpm);
}

void loop() {
  stepper1.step(stepsPerRevolution);
  delay(100);
  stepper1.step(stepsPerRevolution);
  delay(100);
}