Interactive Light Matrix

Hi Everyone!

I am designing an interactive light installation under a bridge...

Let's assume a simple configuration of 16 overhead spotlights arranged in a 4 x 4 square grid. If someone walks under a specific light it should turn on.

Considering that I'd need 16 sensors, one for each light, I am out of luck with the 8 analog/digital inputs. I assume I'd need to utilize the RS232/485 port.

Any hints how to get this whole thing started hardware and software wise?

Thank you for your help in advance!


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