Counting in Binary

For this challenge, we modified the code that was provided so that the binary number starts in 0000 all the LEDs will be off. Then we went to 1 which was 0001 and only the first LED will blink. Then we went to 2 which was 0010 and the second LED will blink. Then we went to 3 which was 0011 and the first and the second LED will turn on. We continued this method until all numbers displayed up to 15. Below is a video of the LED lights turning on counting in binary.