const int stepsPerRevolution = 1500;
// change this to fit the number of steps per revolution
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 10, 9, 11);
// set the speed at 20 rpm:
// initialize the serial port:
void loop() { // step one revolution in one direction:
Serial.println("clockwise");
myStepper.step(stepsPerRevolution);
delay(500);// step one revolution in the other direction:
Serial.println("counterclockwise");
myStepper.step(-stepsPerRevolution); delay(500);