#define LED0 1
#define LED1 5
#define LED2 9
#define LED3 11

void setup() {
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}
int reverse(int r){
  if(r==1)
  return 0;
  else if(r==0)
  return 1;
}
void binaryCount(int num,int *direction) {
  if(*direction=1)
  {
    digitalWrite(LED0, num & 0x01);
    digitalWrite(LED1, (num >> 1) & 0x01);
    digitalWrite(LED2, (num >> 2) & 0x01);
    digitalWrite(LED3, (num >> 3) & 0x01);
  }
  if(*direction=0)
  {
    digitalWrite(LED0, reverse(num & 0x01));
    digitalWrite(LED1, reverse((num >> 1) & 0x01));
    digitalWrite(LED2, reverse((num >> 2) & 0x01));
    digitalWrite(LED3, reverse((num >> 3) & 0x01));
  }
}

void loop() {
  int direction=1;
  for (int i = 0; i < 16; i++) {
      binaryCount(i,&direction);
      delay(1000);
    
     // Adjust the delay time as needed
  }
  direction=0;
  for (int i = 0; i < 16; i++) {
      binaryCount(i,&direction);
      delay(1000);
    }
}