#include "Stepper.h"
#define STEPS  3200
#define SDELAY 100

bool clickFlag;  
bool dirFlag;  

const int clkPin=2;   
const int aPin=3;    
const int bPin=4;    

int ogPos = 0;    
int newPos; 
    
int qSteps;      

Stepper nema(STEPS, 8, 10, 9, 11);


void isr ()  {
  delay(4);
  if (digitalRead(clkPin))
    clickFlag = digitalRead(aPin);
  else
    clickFlag = !digitalRead(aPin);
  dirFlag = true;
}

void setup ()  {
  
pinMode(clkPin,INPUT);
pinMode(aPin,INPUT);  
pinMode(bPin,INPUT);
digitalWrite(bPin, HIGH); 
attachInterrupt (0,isr,FALLING);
}

void loop ()  {
  nema.setSpeed(600); 
  if (!(digitalRead(aPin))) {  
    if (ogPos == 0) {  
    } else {
        nema.step(-(ogPos*50));
        ogPos=0; // Reset position to ZERO
      }
    }

  // Runs if rotation was detected
  if (clickFlag)  {
    newPos = ogPos; 
    if (dirFlag) {
      ogPos = ogPos - 1;} 
    else {
      ogPos = ogPos + 1;} 

    clickFlag = false;  /

    if ((newPos + 1) == ogPos) {
      qSteps = 50; 
      nema.step(qSteps);
    }

    if ((ogPos + 1) == newPos) { 
      qSteps = -50;
      nema.step(qSteps);
    }
  }
}