// Include the AccelStepper Library
#include <AccelStepper.h>

// Define pin connections
const int dirPin = 0;
const int stepPin = 1;

// Define motor interface type
#define motorInterfaceType 1

#define INTERRUPTPIN 2

// Creates an instance
AccelStepper myStepper(motorInterfaceType, stepPin, dirPin);

void blink() {
	myStepper.moveTo(100);
}

void setup() {
	pinMode(INTERRUPTPIN, INPUT_PULLUP);
	attachInterrupt(digitalPinToInterrupt(INTERRUPTPIN),blink,FALLING);
	// set the maximum speed, acceleration factor,
	// initial speed and the target position
	myStepper.setMaxSpeed(1000);
	myStepper.setAcceleration(5);
	myStepper.setSpeed(200);
	myStepper.moveTo(100);
}

void loop() {
	// Change direction once the motor reaches target position
	if (myStepper.distanceToGo() == 0) 
		myStepper.moveTo(0);
		//myStepper.moveTo(-myStepper.currentPosition());

	// Move the motor one step
	myStepper.run();
}