#include <Stepper.h>
const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
int stepCount = 0;

const int buttonStart = 3;
int lastButtonStart = LOW;
int curButtonStart = LOW;

const int buttonLeft = 2;
int lastButtonLeft = LOW;
int curButtonLeft = LOW;

const int buttonRight = 4;
int lastButtonRight = LOW;
int curButtonRight = LOW;

bool start = false;
int num = 100;

void setup() {

  pinMode(buttonStart, INPUT);
  digitalWrite(buttonStart, HIGH);
  pinMode(buttonLeft, INPUT);
  digitalWrite(buttonLeft, HIGH);
  pinMode(buttonRight, INPUT);
  digitalWrite(buttonRight, HIGH);
}

int debounce (int last, int button)
{
  int current = digitalRead(button);
  if (last != current)
  {
    delay(5);
    current = digitalRead(button);
  }
  return current;
}

void loop()
{
  curButtonStart = debounce (lastButtonStart, buttonStart );
  if (lastButtonStart == HIGH && curButtonStart == LOW)
  {
    start = !start;
  }
  lastButtonStart = curButtonStart;

  curButtonLeft = debounce (lastButtonLeft, buttonLeft );
  if (lastButtonLeft == HIGH && curButtonLeft == LOW)
  {
    num = -100;
  }
  lastButtonLeft = curButtonLeft;

  curButtonRight = debounce (lastButtonRight, buttonRight );
  if (lastButtonRight == HIGH && curButtonRight == LOW)
  {
    num = 100;
  }
  lastButtonRight = curButtonRight;

  if (start == true) {
    int sensor = analogRead(A0);
    int motorSpeed = map(sensor, 0, 1023, 0, 100);
    if (motorSpeed > 0)
    {
      myStepper.setSpeed(motorSpeed);
      myStepper.step(stepsPerRevolution / num); 
    }
  }

}