I thought that binary was interesting as a 6 year old kid... and other number systems. And codes and ciphers. And mythology. In fact, if there was a different way of encoding information, I was intrigued by it.

This doesn't mean everybody would be -- and I think your approach of having a board moving a robot car is a great idea that probably has a broader appeal -- but it's probably good not to rule out the idea that there could be even a natural curiosity about binary numbers.