#include <Stepper.h>

const int stepsPer = 200;
Stepper myStepper(stepsPer,8,9,10,11);
const int potPin = A0; 
const int buttonPin = 2; 

int buttonState = 0;
int direction = 1;

void setup() {
 
  myStepper.setSpeed(60);
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {

  buttonState = digitalRead(buttonPin);
  if (buttonState == LOW) {
    direction *= -1; 
    delay(200); 
  }

  int potValue = analogRead(potPin);

  int speed = map(potValue, 0, 1023, 10, 100);
  myStepper.setSpeed(speed);
  myStepper.step(direction * stepsPer);
  delay(500);

}