Tells stepper motor to turn two steps clockwise and one step counterclockwise continuously.

stepper.ino

#include <Stepper.h>

const int stepsPerRev = 200;

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

void setup() {
  myStepper.setSpeed(60);
  Serial.begin(9600);
}

void loop() {
  Serial.println("clockwise");
  myStepper.step(stepsPerRev);
  delay(500);
  
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRev);
  delay(500);
}