#define DISTANCE 1  // Define the discrete length of a step

int StepCounter = 0;
bool Stepping = false;

/* Declare flag pin to send digital output to the RASPBERRY PI */
const int signal_pin = 12;

/* Easy Driver pins */
const int driver_dir = 8;
const int driver_stp = 9;

/* Physical buttons */
const int button_up = 2;
const int button_down = 3;


void setup() 
  {

  /* Report state of automata: listening or stepping? */
  pinMode(signal_pin, OUTPUT);  
  digitalWrite(signal_pin, LOW);
  

  
  /* Easy Driver
  To control direction. Set as LOW for UP direction and HIGH for DOWN direction */
  pinMode(driver_dir, OUTPUT);
  
  /* To step one step */
  pinMode(driver_stp, OUTPUT); 
  digitalWrite(driver_dir, LOW);     // Starting direction is UP
  digitalWrite(driver_stp, LOW);     //  No-step

  /* Up */
  pinMode(button_up, INPUT);         // physical button step-up
  
  /* Down */
  pinMode(button_down, INPUT);       // physical button step-down 
  }


void loop() 
  {

  /* Check up direction with */
  if ((digitalRead(button_up) == LOW) && (Stepping == false )) 
    {
    digitalWrite(driver_dir, LOW);
    Stepping = true;
    digitalWrite(signal_pin, HIGH);  
    }
    
  
  /* Check down direction with */
  if ((digitalRead(button_down) == LOW) && (Stepping == false ))
    {
     digitalWrite(driver_dir, HIGH);
     Stepping = true;
     digitalWrite(signal_pin, HIGH); 
    }
  

  /* If wished, go ahead and step */
  if (Stepping == true)
    {
    digitalWrite(driver_stp, HIGH);
    delay(1);
    digitalWrite(driver_stp, LOW);
    delay(1);
    StepCounter += 1;
    if (StepCounter == DISTANCE)
       {
        StepCounter = 0;
        Stepping = false;
        digitalWrite(signal_pin, LOW); 
        }
    }
  }