#include <AccelStepper.h>

const int DIR = 12;
const int STEP = 14;

#define motorInterfaceType 1
AccelStepper motor(motorInterfaceType, STEP, DIR);

void setup() {
  Serial.begin(115200);
  motor.setMaxSpeed(1000);
  motor.setAcceleration(50);
  motor.setSpeed(200);
  motor.moveTo(200);
}

void loop() {
  if (motor.distanceToGo() == 0) {
    motor.moveTo(-motor.currentPosition());
    Serial.println("Rotating Motor in opposite direction...");
  }
  motor.run();
}