Has anyone implemented a touch-less switch?

[u/pacoii]

I have a use case for a touch-less switch and wondering if anyone has implemented anything like that? Basically wave your hand in front of this sensor to turn something on and wave again to turn it off. It needs to specifically be the wave action and not just the standard broad motion sensing.

I’m wondering if it’s possible to narrow the FOV and shorten the range of a normal motion sensor to achieve this?

If anyone has implemented something like this, I’d love to hear what you did.