#include <stdio.h>
// #include <HC-SR04.h>

int led1 = 8;
int led2 = 9;
int led3 = 10;
int led4 = 11;
int led5 = 12;
int led6 = 13;
int i = 0;

void setup()
{
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
}

void loop() 
{
  digitalWrite(led1, i & 0b000001);
  digitalWrite(led2, i & 0b000010);
  digitalWrite(led3, i & 0b000100);
  digitalWrite(led4, i & 0b001000);
  digitalWrite(led5, i & 0b010000);
  digitalWrite(led6, i & 0b100000);
  i++;
  delay(1000);
}