#include <AccelStepper.h>

AccelStepper stepper; // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

void setup() {
  // put your setup code here, to run once:
  stepper.setMaxSpeed(1000);
  stepper.setSpeed(50);        
}

void loop() {
  // put your main code here, to run repeatedly:
  stepper.runSpeed();
}