So the whole thing works pretty much just like any regular parking sensor, only that it’s built at home using nothing more than cheap parts and an Arduino board.

Someone that built a smart garage stoplight that can help with parking, and the whole thing is powered by an Arduino board that controls a couple of sensors ...

What gives? The secret is that smart parking is really a kind of Trojan horse for capping the build-out of more parking–and creating disincentives for driving.