/*EX2,2.1: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;
static int arr[5];
const int GPIO_Pins[] = {0,1,2,3};

void setup() {
  // put your setup code here, to run once:
  for (int led = 0; led < numLEDs; led++)
  {
    pinMode(GPIO_Pins[led], OUTPUT);
    digitalWrite(GPIO_Pins[led],LOW);
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 1; i <= 15; i++) {
    
      binaryLEDs(i);
    
   delay(1000);
  }
delay(2000);
}
void binaryLEDs(int num)
{
  for (int i = 0; i < 4; i++) {
    arr[i] = num % 2;
    num = num / 2;
    if (arr[i] == 1)
      digitalWrite(GPIO_Pins[i], HIGH);
    else
      digitalWrite(GPIO_Pins[i], LOW);
  }
  
}