/*Write a program to display the numbers in increasing order from 1 to 15 in binary form, using 4 LEDs, with a delay of 1 sec. 
When it reaches the maximum value (15), wait 2 seconds and start from the minimum (1).*/

const int numLEDs = 4;
const int GPIO_Pins[] = {1, 5, 8, 15};
const int blinkRate = 1000;

void setup() {
  // put your setup code here, to run once:
  for (int i = 0; i < numLEDs; i++)
    pinMode(GPIO_Pins[i], OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  int binary[15][4];

    for (int i = 0; i < 15; i++)
    {
        int num = i + 1;
        for (int j = 3; j >= 0; j--)
        {
          int n = num % 2;
          num = num / 2;
          binary[i][j] = n;
        }
    }

  for(int i = 0; i < 15; i++)
  {
    for (int j = 0; j < 4; j++)
    {
      if (binary[i][j] == 1)
      {
        digitalWrite(GPIO_Pins[j], HIGH);
      }
      else
      {
        digitalWrite(GPIO_Pins[j], LOW);
      }
    }
    delay(1000);
  }
  delay(2000);
}