//REVERSE COUNTING USING BITREAD FUNCTION

const int ledPins[] = {5,4,3,2};
int count = 15;

void setup() {
  for(int j = 0; j < 4; j++)
  {
    pinMode(ledPins[j], OUTPUT);
  }
}

void loop() {
  for(int j = 0; j < 4; j++)
  {
   digitalWrite(ledPins[j], bitRead(count,j));
  }

  count--;

  if(count < 0)
  {
    count = 15;
  }

  delay(1000);
}




//const int ledPins[] = {5,4,3,2};
//int count = 0;

//void setup() {
  //for(int j = 0; j < 4; j++)
 // {
    //pinMode(ledPins[j], OUTPUT);
  ////}
//}

//void loop() {
  //for(int j = 0; j < 4; j++)
  //{
   //digitalWrite(ledPins[j], not bitRead(count,j));
 // }

  //count++;

  //if(count == 16)
 // {
   // count = 0;
  //}

 //delay(1000);
//}