#include <Stepper.h> 

const int stepsPerRevolution = 200; 
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

const byte pinStartBut = 4;
const byte pinRightBut = 2;
const byte pinLeftBut = 3;
const byte pinPot = A0;
int dir = 1;
bool isOn = false;
int lastStartButton = HIGH;
int currStartButton = HIGH;
int lastRightButton = HIGH;
int currRightButton = HIGH;
int lastLeftButton = HIGH;
int currLeftButton = HIGH;

void setup() {
  pinMode(pinStartBut, INPUT_PULLUP);
  pinMode(pinRightBut, INPUT_PULLUP);
  pinMode(pinLeftBut, INPUT_PULLUP);
  pinMode(pinPot, INPUT);
}


void PushStartButton()
{
  static unsigned long timer;
  if (timer + 50 > millis()) return;
  currStartButton = digitalRead(pinStartBut);
  if (lastStartButton == HIGH && currStartButton == LOW)
  {
    isOn = !isOn;
  }
  lastStartButton = currStartButton;
  timer = millis();
}

void PushRightButton()
{
  currRightButton = digitalRead(pinRightBut);
  if (lastRightButton == HIGH && currRightButton == LOW)
  {
    dir = 1;
    delay(5);
  }
  lastRightButton = currRightButton;
}

void PushLeftButton()
{
  currLeftButton = digitalRead(pinLeftBut);
  if (lastLeftButton == HIGH && currLeftButton == LOW)
  {
    dir = -1;
    delay(5);
  }
  lastLeftButton = currLeftButton;
}

void loop() {
  
  PushStartButton();
  PushRightButton();
  PushLeftButton();

  int speed = analogRead(pinPot);
  int motorSpeed = map(speed, 0, 1023, 0, 100);

  if (motorSpeed > 0 && isOn)
  {
    myStepper.setSpeed(motorSpeed); 
    myStepper.step(dir * stepsPerRevolution / 100);
  }

}