#include<stdio.h>
#include<stdlib.h>
int arr[5];
void oddnum(int number);
const int numL = 4;
const int gpio[]={2,5,9,13};
void setup() {
  Serial1.begin(9600);
  for(int i=0;i<numL;i++){
    pinMode(gpio[i],OUTPUT);
  }
}

void loop() {
  for(int i=1;i<=15;i+=1){
    if(i%2==0){
      oddnum(i);
    }
    delay(3000);
  }
  delay(1000);
}
void oddnum(int number){
  for(int i=0;i<4;i++){
    arr[i]=number%2;
    number=number/2;
    if(arr[i]==1){
      digitalWrite(gpio[i],HIGH);
    }else{
      digitalWrite(gpio[i],LOW);
    }
  }
}